|Mafic: plagioclase, amphibole, and pyroxene, sometimes feldspathoids, or olivine.|
Basalt (US: / /,, UK: / /,) is a fine-grained extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or a moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System; for example, the bulk of the plains of Venus, which cover ∼80% of the surface, are basaltic, the lunar maria are plains of flood basaltic lava flows, and basalt is a common rock on the surface of Mars.
Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations.
Definition and characteristics
Geologists classify igneous rock by its mineral content whenever possible, with the relative volume percentages of quartz, alkali feldspar, plagioclase, and feldspathoid (QAPF) being particularly important. An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, with plagioclase making up at least 65% of its feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. Basalt is further distinguished from andesite by its silica content of less than 52%.
It is often not practical to determine the mineral composition of volcanic rocks, due to their very fine grain size, and geologists then classify the rocks chemically, with the total content of alkali metal oxides and silica (TAS) being particularly important. Basalt is then defined as volcanic rock with a content of 45% to 52% silica and not more than 5% alkali metal oxides. This places basalt in the B field of the TAS diagram. Such a composition is described as mafic.
Basalt is usually dark grey to black in colour, due to its high content of augite or other dark-coloured pyroxene minerals, but can exhibit a wide range of shading. Some basalts are quite light-coloured due to a high content of plagioclase, and these are sometimes described as leucobasalts. Lighter basalt can be difficult to distinguish from andesite, but a common rule of thumb, used in field research, is that basalt has a color index of 35 or greater.
The physical properties of basalt reflect its relatively low silica content and typically high iron and magnesium content. The average density of basalt is 2.9 g/cm3, compared with a typical density for granite of 2.7 g/cm3. The viscosity of basaltic magma is relatively low, around 104 to 105 cP, although this is still many orders of magnitude higher than water (which has a viscosity of about 1 cP). The viscosity of basaltic magma is similar to that of ketchup.
Basalt is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. These phenocrysts usually are of augite, olivine, or a calcium-rich plagioclase, which have the highest melting temperatures of the typical minerals that can crystallize from the melt and are therefore the first to form solid crystals.
Basalt often contains vesicles, formed when dissolved gases bubble out of the magma as it decompresses during its approach to the surface, and the erupted lava then solidifies before the gases can escape. When vesicles make up a substantial fraction of the volume of the rock, the rock is described as scoria.
The term basalt is at times applied to shallow intrusive rocks with a composition typical of basalt, but rocks of this composition with a phaneritic (coarser) groundmass are more properly referred to as diabase (also called dolerite) or, when more coarse-grained (crystals over 2 mm across), as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt.
In the Hadean, Archean, and early Proterozoic eons of Earth's history, the chemistry of erupted magmas was significantly different from today's, due to immature crustal and asthenosphere differentiation. These ultramafic volcanic rocks, with silica (SiO2) contents below 45% are usually classified as komatiites.
The word "basalt" is ultimately derived from Late Latin basaltes, a misspelling of Latin basanites "very hard stone", which was imported from Ancient Greek βασανίτης (basanites), from βάσανος (basanos, "touchstone"). The modern petrological term basalt describing a particular composition of lava-derived rock, originates from its use by Georgius Agricola in 1546 in his work De Natura Fossilium. Agricola applied "basalt" to the volcanic black rock beneath the Bishop of Meißen's Stolpen castle, believing it to be the same as the "basaniten" described by Pliny the Elder in AD 77 in Naturalis Historiae.
On Earth, most basalt magmas have formed by decompression melting of the mantle. The high pressure in the upper mantle (due to the weight of the overlying rock) raises the melting point of mantle rock, so that almost all of the upper mantle is solid. However, mantle rock is ductile (the solid rock slowly deforms under high stress). Where tectonic forces cause hot mantle rock to creep upwards, the decrease of the pressure on the ascending rock can cause its melting point to drop enough for the rock to partially melt. This produce basaltic magma.
Decompression melting can occur in a variety of tectonic settings. These include continental rifts zones, at mid-ocean ridges, above hotspots, and in back-arc basins. Basalt is also produced in subduction zones, where mantle rock rises into a mantle wedge above the descending slab. Decompression melting in this setting is enhanced by further lowering of the melting point by water vapor and other volatiles released from the slab. Each such setting produces basalt with distinctive characteristics.
- Tholeiitic basalt is relatively rich in iron and poor in alkali metals and aluminium. Included in this category are most basalts of the ocean floor, most large oceanic islands, and continental flood basalts such as the Columbia River Plateau.
- High and low titanium basalts. Basalt rocks are in some cases classified after their titanium (Ti) content in High-Ti and Low-Ti varieties. High-Ti and Low-Ti basalts have been distinguished in the Paraná and Etendeka traps and the Emeishan Traps.
- Mid-ocean ridge basalt (MORB) is a tholeiitic basalt commonly erupted only at ocean ridges and is characteristically low in incompatible elements. Although all MORBs are chemically similar, geologists recognize that they vary significantly in how depleted they are in incompatible elements. Their presence in close proximity along mid-ocean ridges is interpreted as evidence for mantle inhomogeneity.
- E-MORB, enriched MORB, is relatively undepleted in incompatible elements. E_MORB was once thought to be typical of hot spots along mid-ocean ridges, such as Iceland, but is now known to be present in many locations along mid-ocean ridges.
- N-MORB, normal MORB, is average in its content of incompatible elements.
- D-MORB, depleted MORB, is highly depleted in incompatible elements
- Alkali basalt is relatively rich in alkali metals. It is silica-undersaturated and may contain feldspathoids, alkali feldspar, phlogopite, and kaersutite. Augite in alkali basalts is titanium-enriched augite, and low-calcium pyroxenes are never present. They are characteristic of continental rifting and hotspot volcanism.
- High-alumina basalt has greater than 17% alumina (Al2O3) and is intermediate in composition between tholeiitic basalt and alkali basalt. Its relatively alumina-rich composition is based on rocks without phenocrysts of plagioclase. These represent the low silica end of the calc-alkaline magma series and are characteristic of volcanic arcs above subduction zones.
- Boninite is a high-magnesium form of basalt that is erupted generally in back-arc basins, distinguished by its low titanium content and trace-element composition.
- Ocean island basalts include both tholeiites and alkali basalts, with tholeiite predominating early in the eruptive history of the island. These basalts are characterized by elevated concentrations of incompatible elements. This suggests that their source mantle rock has produced little magma in the past (it is undepleted.)
The mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene. Olivine can also be a significant constituent. Accessory minerals present in relatively minor amounts include iron oxides and iron-titanium oxides, such as magnetite, ulvöspinel, and ilmenite. Because of the presence of such oxide minerals, basalt can acquire strong magnetic signatures as it cools, and paleomagnetic studies have made extensive use of basalt.
In tholeiitic basalt, pyroxene (augite and orthopyroxene or pigeonite) and calcium-rich plagioclase are common phenocryst minerals. Olivine may also be a phenocryst, and when present, may have rims of pigeonite. The groundmass contains interstitial quartz or tridymite or cristobalite. Olivine tholeiitic basalt has augite and orthopyroxene or pigeonite with abundant olivine, but olivine may have rims of pyroxene and is unlikely to be present in the groundmass.
Alkali basalts typically have mineral assemblages that lack orthopyroxene but contain olivine. Feldspar phenocrysts typically are labradorite to andesine in composition. Augite is rich in titanium compared to augite in tholeiitic basalt. Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.
Basalt has high liquidus and solidus temperatures—values at the Earth's surface are near or above 1200 °C (liquidus) and near or below 1000 °C (solidus); these values are higher than those of other common igneous rocks.
The majority of tholeiitic basalts are formed at approximately 50–100 km depth within the mantle. Many alkali basalts may be formed at greater depths, perhaps as deep as 150–200 km. The origin of high-alumina basalt continues to be controversial, with disagreement over whether it is a primary melt or derived from other basalt types by fractionation.:65
Relative to most common igneous rocks, basalt compositions are rich in MgO and CaO and low in SiO2 and the alkali oxides, i.e., Na2O + K2O, consistent with their TAS classification. Basalt contains more silica than picrobasalt and most basanites and tephrites but less than basaltic andesite. Basalt has a lower total content of alkali oxides than trachybasalt and most basanites and tephrites.
Basalt generally has a composition of 45–52 wt% SiO2, 2–5 wt% total alkalis, 0.5–2.0 wt% TiO2, 5–14 wt% FeO and 14 wt% or more Al2O3. Contents of CaO are commonly near 10 wt%, those of MgO commonly in the range 5 to 12 wt%.
High-alumina basalts have aluminium contents of 17–19 wt% Al2O3; boninites have magnesium (MgO) contents of up to 15 percent. Rare feldspathoid-rich mafic rocks, akin to alkali basalts, may have Na2O + K2O contents of 12% or more.
The abundances of the lanthanide or rare-earth elements (REE) can be a useful diagnostic tool to help explain the history of mineral crystallisation as the melt cooled. In particular, the relative abundance of europium compared to the other REE is often markedly higher or lower, and called the europium anomaly. It arises because Eu2+ can substitute for Ca2+ in plagioclase feldspar, unlike any of the other lanthanides, which tend to only form 3+ cations.
Mid-ocean ridge basalts (MORB) and their intrusive equivalents, gabbros, are the characteristic igneous rocks formed at mid-ocean ridges. They are tholeiitic basalts particularly low in total alkalis and in incompatible trace elements, and they have relatively flat REE patterns normalized to mantle or chondrite values. In contrast, alkali basalts have normalized patterns highly enriched in the light REE, and with greater abundances of the REE and of other incompatible elements. Because MORB basalt is considered a key to understanding plate tectonics, its compositions have been much studied. Although MORB compositions are distinctive relative to average compositions of basalts erupted in other environments, they are not uniform. For instance, compositions change with position along the Mid-Atlantic Ridge, and the compositions also define different ranges in different ocean basins. Mid-ocean ridge basalts have been subdivided into varieties such as normal (NMORB) and those slightly more enriched in incompatible elements (EMORB).
Isotope ratios of elements such as strontium, neodymium, lead, hafnium, and osmium in basalts have been much studied to learn about the evolution of the Earth's mantle. Isotopic ratios of noble gases, such as 3He/4He, are also of great value: for instance, ratios for basalts range from 6 to 10 for mid-ocean ridge tholeiitic basalt (normalized to atmospheric values), but to 15–24 and more for ocean-island basalts thought to be derived from mantle plumes.
Morphology and textures
The shape, structure and texture of a basalt is diagnostic of how and where it erupted—for example, whether into the sea, in an explosive cinder eruption or as creeping pāhoehoe lava flows, the classic image of Hawaiian basalt eruptions.
Basalt in the tops of subaerial lava flows and cinder cones will often be highly vesiculated, imparting a lightweight "frothy" texture to the rock. Basaltic cinders are often red, coloured by oxidized iron from weathered iron-rich minerals such as pyroxene.
ʻAʻā types of blocky, cinder and breccia flows of thick, viscous basaltic lava are common in Hawaiʻi. Pāhoehoe is a highly fluid, hot form of basalt which tends to form thin aprons of molten lava which fill up hollows and sometimes forms lava lakes. Lava tubes are common features of pāhoehoe eruptions.
Basaltic tuff or pyroclastic rocks are less common than basaltic lava flows. Usually basalt is too hot and fluid to build up sufficient pressure to form explosive lava eruptions but occasionally this will happen by trapping of the lava within the volcanic throat and buildup of volcanic gases. Hawaiʻi's Mauna Loa volcano erupted in this way in the 19th century, as did Mount Tarawera, New Zealand in its violent 1886 eruption. Maar volcanoes are typical of small basalt tuffs, formed by explosive eruption of basalt through the crust, forming an apron of mixed basalt and wall rock breccia and a fan of basalt tuff further out from the volcano.
During the cooling of a thick lava flow, contractional joints or fractures form. If a flow cools relatively rapidly, significant contraction forces build up. While a flow can shrink in the vertical dimension without fracturing, it cannot easily accommodate shrinking in the horizontal direction unless cracks form; the extensive fracture network that develops results in the formation of columns. These structures are predominantly hexagonal in cross-section, but polygons with three to twelve or more sides can be observed. The size of the columns depends loosely on the rate of cooling; very rapid cooling may result in very small (<1 cm diameter) columns, while slow cooling is more likely to produce large columns.
The character of submarine basalt eruptions is largely determined by depth of water, since increased pressure restricts the release of volatile gases and results in effusive eruptions. It has been estimated that at depths greater than 500 metres (1,600 ft), explosive activity associated with basaltic magma is suppressed. Above this depth, submarine eruptions are often explosive, tending to produce pyroclastic rock rather than basalt flows. These eruptions, described as Surtseyan, are characterised by large quantities of steam and gas and the creation of large amounts of pumice.
When basalt erupts underwater or flows into the sea, contact with the water quenches the surface and the lava forms a distinctive pillow shape, through which the hot lava breaks to form another pillow. This "pillow" texture is very common in underwater basaltic flows and is diagnostic of an underwater eruption environment when found in ancient rocks. Pillows typically consist of a fine-grained core with a glassy crust and have radial jointing. The size of individual pillows varies from 10 cm up to several metres.
When pāhoehoe lava enters the sea it usually forms pillow basalts. However, when ʻaʻā enters the ocean it forms a littoral cone, a small cone-shaped accumulation of tuffaceous debris formed when the blocky ʻaʻā lava enters the water and explodes from built-up steam.
The island of Surtsey in the Atlantic Ocean is a basalt volcano which breached the ocean surface in 1963. The initial phase of Surtsey's eruption was highly explosive, as the magma was quite fluid, causing the rock to be blown apart by the boiling steam to form a tuff and cinder cone. This has subsequently moved to a typical pāhoehoe-type behaviour.
Basalt is the most common volcanic rock type on Earth, making up over 90% of all volcanic rock on the planet. The crustal portions of oceanic tectonic plates are composed predominantly of basalt, produced from upwelling mantle below the ocean ridges. Basalt is also the principal volcanic rock in many oceanic islands, including the islands of Hawaiʻi, the Faroe Islands, and Réunion. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year.
Basalt is the rock most typical of large igneous provinces. These include continental flood basalts, the most voluminous basalts found on land. Examples of continental flood basalts included the Deccan Traps in India, the Chilcotin Group in British Columbia, Canada, the Paraná Traps in Brazil, the Siberian Traps in Russia, the Karoo flood basalt province in South Africa, and the Columbia River Plateau of Washington and Oregon.
Ancient Precambrian basalts are usually only found in fold and thrust belts, and are often heavily metamorphosed. These are known as greenstone belts, because low-grade metamorphism of basalt produces chlorite, actinolite, epidote and other green minerals.
Other bodies in the Solar System
As well as forming large parts of the Earth's crust, basalt also occurs in other parts of the Solar System. Basalt commonly erupts on Io (the third largest moon of Jupiter), and has also formed on the Moon, Mars, Venus, and the asteroid Vesta.
The dark areas visible on Earth's moon, the lunar maria, are plains of flood basaltic lava flows. These rocks were sampled by the manned American Apollo program, the robotic Russian Luna program, and are represented among the lunar meteorites.
Lunar basalts differ from their Earth counterparts principally in their high iron contents, which typically range from about 17 to 22 wt% FeO. They also possess a wide range of titanium concentrations (present in the mineral ilmenite), ranging from less than 1 wt% TiO2, to about 13 wt.%. Traditionally, lunar basalts have been classified according to their titanium content, with classes being named high-Ti, low-Ti, and very-low-Ti. Nevertheless, global geochemical maps of titanium obtained from the Clementine mission demonstrate that the lunar maria possess a continuum of titanium concentrations, and that the highest concentrations are the least abundant.
Lunar basalts show exotic textures and mineralogy, particularly shock metamorphism, lack of the oxidation typical of terrestrial basalts, and a complete lack of hydration. Most of the Moon's basalts erupted between about 3 and 3.5 billion years ago, but the oldest samples are 4.2 billion years old, and the youngest flows, based on the age dating method of crater counting, are estimated to have erupted only 1.2 billion years ago.
From 1972 to 1985, five Venera and two VEGA landers successfully reached the surface of Venus and carried out geochemical measurements using X-ray fluorescence and gamma-ray analysis. These returned results consistent with the rock at the landing sites being basalts, including both tholeiitic and highly alkaline basalts. The landers are thought to have landed on plains whose radar signature is that of basaltic lava flows. These constitute about 80% of the surface of Venus. Some locations show high reflectivity consistent with unweathered basalt, indicating basaltic volcanism within the last 2.5 million years.
Analysis of Hubble Space Telescope images of Vesta suggests this asteroid has a basaltic crust covered with a brecciated regolith derived from the crust. Evidence from Earth-based telescopes and the Dawn mission suggest that Vesta is the source of the HED meteorites, which have basaltic characteristics. Vesta is the main contributor to the inventory of basaltic asteroids of the main Asteroid Belt.
Lava flows represent a major volcanic terrain on Io. Analysis of the Voyager images led scientists to believe that these flows were composed mostly of various compounds of molten sulfur. However, subsequent Earth-based infrared studies and measurements from the Galileo spacecraft indicate that these flows are composed of basaltic lava with mafic to ultramafic compositions. This conclusion is based on temperature measurements of Io's "hotspots", or thermal-emission locations, which suggest temperatures of at least 1,300 K and some as high as 1,600 K. Initial estimates suggesting eruption temperatures approaching 2,000 K have since proven to be overestimates because the wrong thermal models were used to model the temperatures.
Alteration of basalt
Compared to granitic rocks exposed at the Earth's surface, basalt outcrops weather relatively rapidly. This reflects their content of minerals that crystallized at higher temperatures and in an environment poorer in water vapor than granite. These minerals are less stable in the colder, wetter environment at the Earth's surface. The finer grain size of basalt and the volcanic glass sometimes found between the grains also hasten weathering. The high iron content of basalt causes weathered surfaces in humid climates to accumulate a thick crust of hematite or other iron oxides and hydroxides, staining the rock a brown to rust-red colour. Because of the low potassium content of most basalts, weathering converts the basalt to calcium-rich clay (montmorillonite) rather than potassium-rich clay (illite). Further weathering, particularly in tropical climates, converts the montmorillonite to kaolinite or gibbsite. This produces the distinctive tropical soil known as laterite. The ultimate weathering product is bauxite, the principle ore of aluminium.
Chemical weathering also releases readily water-soluble cations such as calcium, sodium and magnesium, which give basaltic areas a strong buffer capacity against acidification. Calcium released by basalts binds CO2 from the atmosphere forming CaCO3 acting thus as a CO2 trap.
Intense heat or great pressure transforms basalt into its metamorphic rock equivalents. Depending on the temperature and pressure of metamoprhism, these may include greenschist, amphibolite, or eclogite. Basalts are important rocks within metamorphic regions because they can provide vital information on the conditions of metamorphism that have affected the region.
Life on basaltic rocks
The common corrosion features of underwater volcanic basalt suggest that microbial activity may play a significant role in the chemical exchange between basaltic rocks and seawater. The significant amounts of reduced iron, Fe(II), and manganese, Mn(II), present in basaltic rocks provide potential energy sources for bacteria. Some Fe(II)-oxidizing bacteria cultured from iron-sulfide surfaces are also able to grow with basaltic rock as a source of Fe(II). Fe- and Mn- oxidizing bacteria have been cultured from weathered submarine basalts of Loihi Seamount. The impact of bacteria on altering the chemical composition of basaltic glass (and thus, the oceanic crust) and seawater suggest that these interactions may lead to an application of hydrothermal vents to the origin of life.
Basalt is used in construction (e.g. as building blocks or in the groundwork), making cobblestones (from columnar basalt) and in making statues. Heating and extruding basalt yields stone wool, which has potential to be an excellent thermal insulator.
Carbon sequestration in basalt has been studied as a means of removing carbon dioxide, produced by human industrialization, from the atmosphere. Underwater basalt deposits, scattered in seas around the globe, have the added benefit of the water serving as a barrier to the re-release of CO2 into the atmosphere.
- Basalt fan structure – Rock formation composed of columnar jointed basalt columns that have slumped into a fan shape
- Basalt fiber – Strucural fibres spun from melted basalt
- Bimodal volcanism – The eruption of both mafic and felsic lavas from a single volcanic centre
- Polybaric melting
- Shield volcano – Low profile volcano usually formed almost entirely of fluid lava flows
- Spilite – A fine-grained igneous rock, resulting from alteration of oceanic basalt
- Sideromelane – A vitreous basaltic volcanic glass
- Volcano – Rupture in the crust of a planet that allows lava, ash, and gases to escape from below the surface
- American Heritage Dictionary
- Merriam-Webster Dictionary
- Collins English Dictionary
- Oxford Living Dictionaries
- Le Bas, M. J.; Streckeisen, A. L. (1991). "The IUGS systematics of igneous rocks". Journal of the Geological Society. 148 (5): 825–833. Bibcode:1991JGSoc.148..825L. CiteSeerX 10.1.1.692.4446. doi:10.1144/gsjgs.148.5.0825. S2CID 28548230.
- "Rock Classification Scheme - Vol 1 - Igneous" (PDF). British Geological Survey: Rock Classification Scheme. 1: 1–52. 1999.
- "CLASSIFICATION OF IGNEOUS ROCKS". Archived from the original on 30 September 2011.
- Philpotts, Anthony R.; Ague, Jay J. (2009). Principles of igneous and metamorphic petrology (2nd ed.). Cambridge, UK: Cambridge University Press. pp. 139–143. ISBN 978-0-521-88006-0.
- Philpotts & Ague 2009, pp. 139-143.
- "Oilfield Glossary". Schlumberger Ltd. 2021.
- Hyndman, Donald W. (1985). Petrology of igneous and metamorphic rocks (2nd��ed.). McGraw-Hill. ISBN 978-0-07-031658-4.
- Blatt, Harvey; Tracy, Robert J. (1996). Petrology : igneous, sedimentary, and metamorphic (2nd ed.). New York: W.H. Freeman. p. 57. ISBN 978-0-7167-2438-4.
- Levin, Harold L. (2010). The earth through time (9th ed.). Hoboken, N.J.: J. Wiley. p. 63. ISBN 978-0-470-38774-0.
- Wilson, F. H. (1985). "The Meshik Arc - an eocene to earliest miocene magmatic arc on the Alaska Peninsula": PR 88. doi:10.14509/2269. Cite journal requires
- Nozhkin, A.D.; Turkina, O.M.; Likhanov, I.I.; Dmitrieva, N.V. (February 2016). "Late Paleoproterozoic volcanic associations in the southwestern Siberian craton (Angara-Kan block)". Russian Geology and Geophysics. 57 (2): 247–264. Bibcode:2016RuGG...57..247N. doi:10.1016/j.rgg.2016.02.003.
- Philpotts & Ague 2009, p. 139.
- "Basalt". USGS Volcano Hazards program – Glossary. USGS. 8 April 2015. Retrieved 27 July 2018.
- Philpotts & Ague 2009, p. 22.
- Philpotts & Ague 2009, pp. 23-25.
- Blatt & Tracy 1996, p. 57.
- Klein, Cornelis; Hurlbut, Cornelius S., Jr. (1993). Manual of mineralogy : (after James D. Dana) (21st ed.). New York: Wiley. pp. 558–560. ISBN 978-0-471-57452-1.
- Nave, R. "Bowen's Reaction Series". Hyperphysics. Georgia State University. Retrieved 24 March 2021.
- Blatt & Tracy 1996, pp. 27, 42-44.
- Jones, C.E. "Scoria and Pumice". Department of Geology & Planetary Science. University of Pittsburgh. Retrieved 24 March 2021.
- Levin 2010, pp. 58-60.
- Philpotts & Ague 2009, pp. 399-400.
- "Komatiite". Atlas of Magmatic Rocks. Comenius University in Bratislava. Retrieved 24 March 2021.
- Tietz, O.; Büchner, J. (29 December 2018). "The origin of the term 'basalt'". Journal of Geosciences: 295–298. doi:10.3190/jgeosci.273.
- Tietz, Olaf; Büchner, Joerg (2018). "The origin of the term 'basalt'" (PDF). Journal of Geosciences. 63 (4): 295–298. doi:10.3190/jgeosci.273. Retrieved 19 August 2020.
- Philpotts & Ague 2009, pp. 16-17.
- Green, D. H.; Ringwood, A. E. (1 January 1969). "The Origin of Basalt Magmas". Geophysical Monograph Series. 13: 489–495. Bibcode:1969GMS....13..489G. doi:10.1029/GM013p0489. ISBN 978-1-118-66897-9.
- Blatt & Tracy 1996, pp. 1512-156, 191-195, 162-163, 200.
- Philpotts & Ague 2009, pp. 236, 593-595.
- Stern, Robert J. (2002), "Subduction zones", Reviews of Geophysics, 40 (4): 3–31, Bibcode:2002RvGeo..40.1012S, doi:10.1029/2001RG000108
- Stern 2002, p. 22-24.
- Philpotts & Ague 2009, pp. 356-361.
- Philpotts & Ague 2009, pp. 143-146.
- Philpotts & Ague 2009, pp. 365-370.
- Philpotts & Ague 2009, pp. 52-59.
- Gibson, S. A., Thompson, R. N., Dickin, A. P., & Leonardos, O. H. (1995). "High-Ti and low-Ti mafic potassic magmas: Key to plume-lithosphere interactions and continental flood-basalt genesis". Earth and Planetary Science Letters. 136 (3): 149–165. Bibcode:1995E&PSL.136..149G. doi:10.1016/0012-821X(95)00179-G.CS1 maint: multiple names: authors list (link)
- Hou, T., Zhang, Z., Kusky, T., Du, Y., Liu, J., & Zhao, Z. (2011). "A reappraisal of the high-Ti and low-Ti classification of basalts and petrogenetic linkage between basalts and mafic–ultramafic intrusions in the Emeishan Large Igneous Province, SW China" (PDF). Ore Geology Reviews. 41 (1): 133–143. doi:10.1016/j.oregeorev.2011.07.005. Retrieved 18 September 2016.CS1 maint: multiple names: authors list (link)
- Blatt & Tracy 1996, pp. 156-158.
- Hyndman 1985. sfn error: no target: CITEREFHyndman1985 (help)
- Waters, Christopher L.; Sims, Kenneth W. W.; Perfit, Michael R.; Blichert-Toft, Janne; Blusztajn, Jurek (March 2011). "Perspective on the Genesis of E-MORB from Chemical and Isotopic Heterogeneity at 9–10°N East Pacific Rise". Journal of Petrology. 52 (3): 565–602. doi:10.1093/petrology/egq091.
- Donnelly, Kathleen E.; Goldstein, Steven L.; Langmuir, Charles H.; Spiegelman, Marc (October 2004). "Origin of enriched ocean ridge basalts and implications for mantle dynamics". Earth and Planetary Science Letters. 226 (3–4): 347–366. Bibcode:2004E&PSL.226..347D. doi:10.1016/j.epsl.2004.07.019.
- Blatt & Tracy 1996, p. 75.
- Philpotts & Ague 2009, pp. 368-370, 390-394.
- Philpotts & Ague 2009, pp. 375-376.
- Crawford, A.J. (1989). Boninites. London: Unwin Hyman. ISBN 978-0-04-445003-0.
- Philpotts & Ague 2009, pp. 368-370.
- Levin 2010, p. 62.
- Levin 2010, p. 185.
- McBirney, Alexander R. (1984). Igneous petrology. San Francisco, Calif.: Freeman, Cooper. pp. 366–367. ISBN 978-0-19-857810-9.
- Philpotts & Ague 2009, p. 252.
- Condie, Kent C. (1997). "Chapter 3: "Tectonic settings"". Plate Tectonics and Crustal Evolution. Butterworth-Heinemann / Elsevier. p. 69. ISBN 978-0-7506-3386-4.
- KUSHIRO, Ikuo (2007). "Origin of magmas in subduction zones: a review of experimental studies". Proceedings of the Japan Academy, Series B. 83 (1): 1–15. Bibcode:2007PJAB...83....1K. doi:10.2183/pjab.83.1. ISSN 0386-2208. PMC 3756732. PMID 24019580.
- Ozerov, Alexei Y (January 2000). "The evolution of high-alumina basalts of the Klyuchevskoy volcano, Kamchatka, Russia, based on microprobe analyses of mineral inclusions" (PDF). Journal of Volcanology and Geothermal Research. 95 (1–4): 65–79. Bibcode:2000JVGR...95...65O. doi:10.1016/S0377-0273(99)00118-3.
- Irvine, T. N.; Baragar, W. R. A. (1 May 1971). "A Guide to the Chemical Classification of the Common Volcanic Rocks". Canadian Journal of Earth Sciences. 8 (5): 523–548. Bibcode:1971CaJES...8..523I. doi:10.1139/e71-055.
- Irvine & Baragar 1971.
- Philpotts & Ague 2009, p. 359.
- Hofmann, A. W. (21 October 2014). "3.3 – Sampling Mantle Heterogeneity through Oceanic Basalts: Isotopes and Trace Elements". In Carlson, Richard W. (ed.). The Mantle and Core. Treatise on Geochemistry. 3. Elsevier B.V. pp. 67–101. doi:10.1016/B978-0-08-095975-7.00203-5. ISBN 978-0-08-098300-4.
- Philpotts & Ague 2009, p. 312.
- Philpotts & Ague 2009, Chapter 13.
- Class, Cornelia; Goldstein, Steven L. (August 2005). "Evolution of helium isotopes in the Earth's mantle". Nature. 436 (7054): 1107–1112. Bibcode:2005Natur.436.1107C. doi:10.1038/nature03930. PMID 16121171. S2CID 4396462.
- Alexander V. Sobolev; Albrecht W. Hofmann; Dmitry V. Kuzmin; Gregory M. Yaxley; Nicholas T. Arndt; Sun-Lin Chung; Leonid V. Danyushevsky; Tim Elliott; Frederick A. Frey; Michael O. Garcia; Andrey A. Gurenko; Vadim S. Kamenetsky; Andrew C. Kerr; Nadezhda A. Krivolutskaya; Vladimir V. Matvienkov; Igor K. Nikogosian; Alexander Rocholl; Ingvar A. Sigurdsson; Nadezhda M. Sushchevskaya & Mengist Teklay (20 April 2007). "The Amount of Recycled Crust in Sources of Mantle-Derived Melts" (PDF). Science. 316 (5823): 412–417. Bibcode:2007Sci...316..412S. doi:10.1126/science.x. PMID 17395795.
- Schmincke, Hans-Ulrich (2003). Volcanism. Berlin: Springer. ISBN 978-3-540-43650-8.
- Blatt & Tracy 1996, pp. 27-28.
- Blatt & Tracy 1996, pp. 22-23.
- Blatt & Tracy 1996, pp. 43-44.
- Lillie, Robert J. (2005). Parks and plates : the geology of our national parks, monuments, and seashores (1st ed.). New York: W.W. Norton. p. 41. ISBN 978-0-393-92407-7.
- Schmincke 2003, Chapter 12.
- Philpotts & Ague 2009, p. 64.
- Smalley, I.J. 1966. Contraction crack networks in basalt flows. Geological Magazine 103, 110-114. https://doi.org/10.1017/S0016756800050482
- Weaire, D.; Rivier, N. (August 2006). "Soap, cells and statistics—random patterns in two dimensions". Contemporary Physics. 25 (1): 59–99. Bibcode:1984ConPh..25...59W. doi:10.1080/00107518408210979.
- Spry, Alan (January 1962). "The origin of columnar jointing, particularly in basalt flows". Journal of the Geological Society of Australia. 8 (2): 191–216. Bibcode:1962AuJES...8..191S. doi:10.1080/14400956208527873.
- Francis, P. (1993) Volcanoes: A Planetary Perspective, Oxford University Press.
- Parfitt, L. and Wilson, L. (2008) Fundamentals of Physical Volcanology, Blackwell Publishing.
- Head, James W.; Wilson, Lionel (2003). "Deep submarine pyroclastic eruptions: theory and predicted landforms and deposits". Journal of Volcanology and Geothermal Research. 121 (3–4): 155–193. Bibcode:2003JVGR..121..155H. doi:10.1016/S0377-0273(02)00425-0.
- , Smithsonian Institution National Museum of Natural History Global Volcanism Program (2013).
- Schmincke 2003, p. 64.
- Macdonald, Gordon A.; Abbott, Agatin T.; Peterson, Frank L. (1983). Volcanoes in the sea : the geology of Hawaii (2nd ed.). Honolulu: University of Hawaii Press. ISBN 978-0-8248-0832-7.
- Kokelaar, B.Peter; Durant, Graham P. (December 1983). "The submarine eruption and erosion of Surtla (Surtsey), Iceland". Journal of Volcanology and Geothermal Research. 19 (3–4): 239–246. Bibcode:1983JVGR...19..239K. doi:10.1016/0377-0273(83)90112-9.
- Moore, James G. (November 1985). "Structure and eruptive mechanisms at Surtsey Volcano, Iceland". Geological Magazine. 122 (6): 649–661. Bibcode:1985GeoM..122..649M. doi:10.1017/S0016756800032052.
- Blatt & Tracy 1996, pp. 24-25.
- "Basalt". Geology: rocks and minerals. The University of Auckland. 2005. Retrieved 27 July 2018.
- Philpotts & Ague 2009, pp. 366-368.
- Schmincke 2003, p. 91.
- Upton, B. G. J.; Wadsworth, W. J. (July 1965). "Geology of Réunion Island, Indian Ocean". Nature. 207 (4993): 151–154. Bibcode:1965Natur.207..151U. doi:10.1038/207151a0. S2CID 4144134.
- Walker, G.P.L. (1993). "Basaltic-volcano systems". In Prichard, H.M.; Alabaster, T.; Harris, N.B.W.; Neary, C.R. (eds.). Magmatic Processes and Plate Tectonics. Geological Society Special Publication 76. The Geological Society. pp. 3–38. ISBN 978-0-903317-94-8.
- Mahoney, John J. (1988). "Deccan Traps". Continental Flood Basalts. Petrology and Structural Geology. 3: 151–194. doi:10.1007/978-94-015-7805-9_5. ISBN 978-90-481-8458-3.
- Bevier, Mary Lou (1 April 1983). "Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia". Canadian Journal of Earth Sciences. 20 (4): 515–524. Bibcode:1983CaJES..20..515B. doi:10.1139/e83-049.
- Renne, P. R.; Ernesto, M.; Pacca, I. G.; Coe, R. S.; Glen, J. M.; Prevot, M.; Perrin, M. (6 November 1992). "The Age of Parana Flood Volcanism, Rifting of Gondwanaland, and the Jurassic-Cretaceous Boundary". Science. 258 (5084): 975–979. Bibcode:1992Sci...258..975R. doi:10.1126/science.258.5084.975. PMID 17794593. S2CID 43246541.
- Renne, P. R.; Basu, A. R. (12 July 1991). "Rapid Eruption of the Siberian Traps Flood Basalts at the Permo-Triassic Boundary". Science. 253 (5016): 176–179. Bibcode:1991Sci...253..176R. doi:10.1126/science.253.5016.176. PMID 17779134. S2CID 6374682.
- Jourdan, F.; Féraud, G.; Bertrand, H.; Watkeys, M. K. (February 2007). "From flood basalts to the inception of oceanization: Example from the 40 Ar/ 39 Ar high-resolution picture of the Karoo large igneous province: KAROO LARGE IGNEOUS PROVINCE". Geochemistry, Geophysics, Geosystems. 8 (2): n/a. doi:10.1029/2006GC001392.
- Hooper, P. R. (19 March 1982). "The Columbia River Basalts". Science. 215 (4539): 1463–1468. Bibcode:1982Sci...215.1463H. doi:10.1126/science.215.4539.1463. PMID 17788655. S2CID 6182619.
- Philpotts & Ague 2009, pp. 374-380.
- Philpotts & Ague 2009, pp. 398-399.
- Smithies, R. Hugh; Ivanic, Tim J.; Lowrey, Jack R.; Morris, Paul A.; Barnes, Stephen J.; Wyche, Stephen; Lu, Yong-Jun (April 2018). "Two distinct origins for Archean greenstone belts". Earth and Planetary Science Letters. 487: 106–116. Bibcode:2018E&PSL.487..106S. doi:10.1016/j.epsl.2018.01.034.
- Blatt & Tracy 1996, pp. 366-367.
- Lopes, Rosaly M. C.; Gregg, Tracy K. P. (2004). Volcanic Worlds: Exploring The Solar System's Volcanoes. Springer-Praxis. p. 135. ISBN 978-3-540-00431-8.
- Lucey, P. (1 January 2006). "Understanding the Lunar Surface and Space-Moon Interactions". Reviews in Mineralogy and Geochemistry. 60 (1): 83–219. Bibcode:2006RvMG...60...83L. doi:10.2138/rmg.2006.60.2.
- Bhanoo, Sindya N. (28 December 2015). "New Type of Rock Is Discovered on Moon". The New York Times. Retrieved 29 December 2015.
- Ling, Zongcheng; Jolliff, Bradley L.; Wang, Alian; Li, Chunlai; Liu, Jianzhong; Zhang, Jiang; Li, Bo; Sun, Lingzhi; Chen, Jian; Xiao, Long; Liu, Jianjun; Ren, Xin; Peng, Wenxi; Wang, Huanyu; Cui, Xingzhu; He, Zhiping; Wang, Jianyu (December 2015). "Correlated compositional and mineralogical investigations at the Chang′e-3 landing site". Nature Communications. 6 (1): 8880. Bibcode:2015NatCo...6.8880L. doi:10.1038/ncomms9880. PMC 4703877. PMID 26694712.
- Giguere, Thomas .A.; Taylor, G. Jeffrey; Hawke, B. Ray; Lucey, Paul G. (2000). "The titanium contents of lunar mare basalts". Meteoritics & Planetary Science. 35 (1): 193–200. Bibcode:2000M&PS...35..193G. doi:10.1111/j.1945-5100.2000.tb01985.x.
- Lucey 2006.
- Hiesinger, Harald; Jaumann, Ralf; Neukum, Gerhard; Head, James W. (25 December 2000). "Ages of mare basalts on the lunar nearside". Journal of Geophysical Research: Planets. 105 (E12): 29239–29275. Bibcode:2000JGR...10529239H. doi:10.1029/2000JE001244.
- Gilmore, Martha; Treiman, Allan; Helbert, Jörn; Smrekar, Suzanne (November 2017). "Venus Surface Composition Constrained by Observation and Experiment". Space Science Reviews. 212 (3–4): 1511–1540. Bibcode:2017SSRv..212.1511G. doi:10.1007/s11214-017-0370-8. S2CID 126225959.
- Grotzinger, J. P. (26 September 2013). "Analysis of Surface Materials by the Curiosity Mars Rover". Science. 341 (6153): 1475. Bibcode:2013Sci...341.1475G. doi:10.1126/science.1244258. PMID 24072916.
- Choi, Charles Q. (11 October 2012). "Meteorite's Black Glass May Reveal Secrets of Mars". Space.com. Future US, Inc. Retrieved 24 March 2021.
- Gattacceca, Jérôme; Hewins, Roger H.; Lorand, Jean-Pierre; Rochette, Pierre; Lagroix, France; Cournède, Cécile; Uehara, Minoru; Pont, Sylvain; Sautter, Violaine; Scorzelli, Rosa. B.; Hombourger, Chrystel; Munayco, Pablo; Zanda, Brigitte; Chennaoui, Hasnaa; Ferrière, Ludovic (October 2013). "Opaque minerals, magnetic properties, and paleomagnetism of the Tissint Martian meteorite". Meteoritics & Planetary Science. 48 (10): 1919–1936. Bibcode:2013M&PS...48.1919G. doi:10.1111/maps.12172.
- Binzel, Richard P; Gaffey, Michael J; Thomas, Peter C; Zellner, Benjamin H; Storrs, Alex D; Wells, Eddie N (July 1997). "Geologic Mapping of Vesta from 1994 Hubble Space Telescope Images". Icarus. 128 (1): 95–103. Bibcode:1997Icar..128...95B. doi:10.1006/icar.1997.5734.
- Mittlefehldt, David W. (June 2015). "Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites". Geochemistry. 75 (2): 155–183. Bibcode:2015ChEG...75..155M. doi:10.1016/j.chemer.2014.08.002.
- Nicholas A. Moskovitz, Robert Jedicke, Eric Gaidos, Mark Willman, David Nesvorný, Ronald Fevig, Željko Ivezić, The distribution of basaltic asteroids in the Main Belt, Icarus, Volume 198, Issue 1, 2008, Pages 77-90, ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2008.07.006. (https://www.sciencedirect.com/science/article/pii/S0019103508002741)
- Keszthelyi, L.; et al. (2001). "Imaging of volcanic activity on Jupiter's moon Io by Galileo during the Galileo Europa Mission and the Galileo Millennium Mission". J. Geophys. Res. 106 (E12): 33025–33052. Bibcode:2001JGR...10633025K. doi:10.1029/2000JE001383.
- Battaglia, Steven M. (March 2019). A Jökulhlaup-like Model for Secondary Sulfur Flows on Io. 50th Lunar and Planetary Science Conference. 18–22 March 2019. The Woodlands, Texas. Bibcode:2019LPI....50.1189B. LPI Contribution No. 1189.
- Keszthelyi, L.; et al. (2007). "New estimates for Io eruption temperatures: Implications for the interior". Icarus. 192 (2): 491–502. Bibcode:2007Icar..192..491K. doi:10.1016/j.icarus.2007.07.008.
- McEwen, A. S.; et al. (1998). "High-temperature silicate volcanism on Jupiter's moon Io" (PDF). Science. 281 (5373): 87–90. Bibcode:1998Sci...281...87M. doi:10.1126/science.281.5373.87. PMID 9651251. S2CID 28222050. Archived from the original (PDF) on 23 September 2020.
- Keszthelyi 2007.
- Battaglia 2019.
- Blatt, Harvey; Middleton, Gerard; Murray, Raymond (1980). Origin of sedimentary rocks (2d ed.). Englewood Cliffs, N.J.: Prentice-Hall. pp. 254–257. ISBN 978-0-13-642710-0.
- Mackin, J.H. (1961). "A stratigraphic section in the Yakima Basalt and the Ellensburg Formation in south-central Washington". Washington Division of Mines and Geology Report of Investigations. 19.
- "Holyoke Basalt". USGS Mineral Resources Program. United States Geological Survey. Retrieved 13 August 2020.
- Anderson, J.L. (1987). "Geologic map of the Goldendale 15' quadrangle, Washington" (PDF). Washington Division of Geology and Earth Resources Open File Report. 87–15. Retrieved 13 August 2020.
- Blatt, Middleton & Murray 1980, pp. 263-264.
- Gillman, G.P; Burkett, D.C; Coventry, R.J (August 2002). "Amending highly weathered soils with finely ground basalt rock". Applied Geochemistry. 17 (8): 987–1001. Bibcode:2002ApGC...17..987G. doi:10.1016/S0883-2927(02)00078-1.
- McGrail, B. Peter; Schaef, H. Todd; Ho, Anita M.; Chien, Yi-Ju; Dooley, James J.; Davidson, Casie L. (December 2006). "Potential for carbon dioxide sequestration in flood basalts: SEQUESTRATION IN FLOOD BASALTS". Journal of Geophysical Research: Solid Earth. 111 (B12): n/a. doi:10.1029/2005JB004169.
- Blatt & Tracy 1996, chapter 22.
- Yardley, Bruce W. D.; Cleverley, James S. (2015). "The role of metamorphic fluids in the formation of ore deposits". Geological Society, London, Special Publications. 393 (1): 117–134. Bibcode:2015GSLSP.393..117Y. doi:10.1144/SP393.5. ISSN 0305-8719. S2CID 130626915.
- Edwards, Katrina J.; Bach, Wolfgang; Rogers, Daniel R. (April 2003). "Geomicrobiology of the Ocean Crust: A Role for Chemoautotrophic Fe-Bacteria". Biological Bulletin. 204 (2): 180–185. doi:10.2307/1543555. JSTOR 1543555. PMID 12700150. S2CID 1717188. Retrieved 4 November 2015.
- Templeton, Alexis S.; Staudigel, Hubert; Tebo, Bradley M. (April 2005). "Diverse Mn(II)-Oxidizing Bacteria Isolated from Submarine Basalts at Loihi Seamount". Geomicrobiology Journal. 22 (3–4): 127–139. doi:10.1080/01490450590945951. S2CID 17410610.
- Martin, William; Baross, John; Kelley, Deborah; Russell, Michael J. (November 2008). "Hydrothermal vents and the origin of life". Nature Reviews Microbiology. 6 (11): 805–814. doi:10.1038/nrmicro1991. PMID 18820700. S2CID 1709272.
- Raj, Smriti; Kumar, V Ramesh; Kumar, B H Bharath; Iyer, Nagesh R (January 2017). "Basalt: structural insight as a construction material". Sādhanā. 42 (1): 75–84. doi:10.1007/s12046-016-0573-9.
- Yıldırım, Mücahit (January 2020). "Shading in the outdoor environments of climate-friendly hot and dry historical streets: The passageways of Sanliurfa, Turkey". Environmental Impact Assessment Review. 80: 106318. doi:10.1016/j.eiar.2019.106318.
- Aldred, Cyril (December 1955). "A Statue of King Neferkarē c Ramesses IX". The Journal of Egyptian Archaeology. 41 (1): 3–8. doi:10.1177/030751335504100102. S2CID 192232554.
- Roobaert, Arlette (1996). "A Neo-Assyrian Statue from Til Barsib". Iraq. 58: 79–87. doi:10.2307/4200420. JSTOR 4200420.
- "Research surveys for basalt rock quarries | Basalt Projects Inc. | Engineering continuous basalt fiber and CBF-based composites". Basalt Projects Inc. Retrieved 10 December 2017.
- De Fazio, Piero. "Basalt fiber: from earth an ancient material for innovative and modern application". Italian national agency for new technologies, energy and sustainable economic development (in English and Italian). Retrieved 17 December 2018.
- Schut, Jan H. "Composites: Higher Properties, Lower Cost". www.ptonline.com. Retrieved 10 December 2017.
- Ross, Anne. "Basalt Fibers: Alternative To Glass?". www.compositesworld.com. Retrieved 10 December 2017.
- Hance, Jeremy (5 January 2010). "Underwater rocks could be used for massive carbon storage on America's East Coast". Mongabay. Retrieved 4 November 2015.
- Goldberg, D. S.; Takahashi, T.; Slagle, A. L. (22 July 2008). "Carbon dioxide sequestration in deep-sea basalt". Proceedings of the National Academy of Sciences. 105 (29): 9920–9925. Bibcode:2008PNAS..105.9920G. doi:10.1073/pnas.0804397105. PMC 2464617. PMID 18626013.
- Alexander Ablesimov, N. E.; Zemtsov, A. N. (2010). Релаксационные эффекты в неравновесных конденсированных системах. Базальты: от извержения до волокна [Relaxation effects in nonequilibrium condensed systems. Basalts from eruption to fiber] (in Russian). Moscow.
- Francis, Peter; Oppenheimer, Clive (2003). Volcanoes (2nd ed.). Oxford: Oxford University Press. ISBN 978-0-19-925469-9.
- Gill, Robin (2010). Igneous rocks and processes : a practical guide. Chichester, West Sussex, UK: Wiley-Blackwell. ISBN 978-1-4443-3065-6.
- Hall, Anthony (1996). Igneous petrology. Harlow: Longman Scientific & Technical. ISBN 978-0-582-23080-4.
- Siegesmund, Siegfried; Snethlage, Rolf, eds. (2013). Stone in architecture properties, durability (3rd ed.). Springer Science & Business Media. ISBN 978-3-662-10070-7.
- Young, Davis A. (2003). Mind over magma : the story of igneous petrology. Princeton, N.J.: Princeton University Press. ISBN 978-0-691-10279-5.
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