Basalt

Basalt (US: /bəˈsɔːlt, ˈbeɪsɒlt/, UK: /ˈbæsɔːlt, ˈbæsəlt/)[1][2][3][4] is a mafic extrusive igneous rock formed from the rapid cooling of lava rich in magnesium and iron[5] exposed at or very near the surface of a terrestrial planet or a moon.[6] More than 90% of all volcanic rock on Earth is basalt.[7]

For other uses, see Basalt (disambiguation).

Basalt
Igneous rock
Composition
Mafic: amphibole and pyroxene, sometimes plagioclase, feldspathoids, and/or olivine.

Molten basalt lava has a low viscosity due to its low silica content, resulting in rapidly moving lava flows that can spread over great areas before cooling and solidification.[8] Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometers and constitute the most voluminous of all volcanic formations.[9]

Definition
Basalt is field B in the TAS diagram.
QAPF diagram with basalt fields highlighted in yellow.
Columnar basalt flows in Yellowstone National Park, USA

Basalt is an aphanitic (fine-grained) igneous rock that is relatively low in silica and alkali metals. It has a silica content of 45–53%[10] and less than 10% feldspathoid by volume, with at least 65% of the rock consisting of feldspar in the form of plagioclase.[11][12][13] This places basalt in the B field of the TAS classification or fields 9, 9', 10, 10', and 10* of the QAPF diagram.[14] Basalt is usually dark grey to black in colour, due to a high content of augite or other pyroxene minerals,[15][16][17] 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.[18][19] Lighter basalt can be difficult to distinguish from andesite. The formal distinction is that the plagioclase in andesites is sodium-rich while that in basalts is calcium-rich, but this cannot be checked outside a laboratory, and a common rule of thumb in the field is that basalt has a color index of 35 or greater.[20] The average density of basalt is 2.9 g/cm3.[21]

Exposed surfaces of basalt outcrops rapidly weather to brown or rust-red[22][23][24] due to oxidation of mafic (iron-rich) minerals into hematite or other iron oxides and hydroxides.[25]

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,[16] which have the highest melting temperatures of the typical minerals that can crystallize from the melt[26] 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 these make up a substantial fraction of the volume of the rock, the rock is described as scoria.[27]

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.[6]

Columnar basalt at Szent György Hill, Hungary
Vesicular basalt at Sunset Crater, Arizona. US quarter for scale.

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.[28]

Etymology

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") and perhaps originated in Egyptian bauhun "slate".[29] The modern petrological term basalt describing a particular composition of lava-derived rock originates from its use by Georgius Agricola in 1556 in his famous work of mining and mineralogy De re metallica, libri XII. Agricola applied "basalt" to the volcanic black rock of the Schloßberg (local castle hill) at Stolpen, believing it to be the same as the "very hard stone" described by Pliny the Elder in Naturalis Historiae.

Types
Large masses must cool slowly to form a polygonal joint pattern, as here at the Giant's Causeway in Northern Ireland
Columns of basalt near Bazaltove, Ukraine

Petrology
Photomicrograph of a thin section of basalt from Bazaltove, Ukraine

The mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene. Olivine can also be a significant constituent.[40] Accessory minerals present in relatively minor amounts include iron oxides and iron-titanium oxides, such as magnetite,ulvöspinel, and ilmenite.[36] 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.[41]

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.[36] Ocean floor basalts, erupted originally at mid-ocean ridges, are known as MORB (mid-ocean ridge basalt) and are characteristically low in incompatible elements.[31]

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.[36]

Basalt has high liquidus and solidus temperatures—values at the Earth's surface are near or above 1200 °C (liquidus)[42] and near or below 1000 °C (solidus); these values are higher than those of other common igneous rocks.[43]

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.[44][45] 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.[46]:65

Geochemistry

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 the TAS classification.[14]

Basalt generally has a composition of 45–55 wt% SiO2, 2–6 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%.[47]

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.[47]

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.[48]

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.[49] Mid-ocean ridge basalts have been subdivided into varieties such as normal (NMORB) and those slightly more enriched in incompatible elements (EMORB).[50]

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.[51] 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.[52]

Source rocks for the partial melts probably include both peridotite and pyroxenite.[53]

Morphology and textures
An active basalt lava flow

The shape, structure and texture of a basalt is diagnostic of how and where it erupted—whether into the sea, in an explosive cinder eruption or as creeping pāhoehoe lava flows, the classic image of Hawaiian basalt eruptions.[54]

Subaerial eruptions
Main article: Subaerial eruption

Basalt that erupts under open air (that is, subaerially) forms three distinct types of lava or volcanic deposits: scoria; ash or cinder (breccia);[55] and lava flows.[56]

Basalt in the tops of subaerial lava flows and cinder cones will often be highly vesiculated, imparting a lightweight "frothy" texture to the rock.[57] Basaltic cinders are often red, coloured by oxidized iron from weathered iron-rich minerals such as pyroxene.[58]

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.[56]

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.[59]

Amygdaloidal structure is common in relict vesicles and beautifully crystallized species of zeolites, quartz or calcite are frequently found.[60]

Columnar basalt
The Giant's Causeway in Northern Ireland
Columnar jointed basalt in Turkey
Columnar basalt at Cape Stolbchaty, Russia
Main article: Columnar jointing

During the cooling of a thick lava flow, contractional joints or fractures form.[61] 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. The topology of the lateral shapes of these columns can broadly be classed as a random cellular network. These structures are predominantly hexagonal in cross-section, but polygons with three to twelve or more sides can be observed.[62] 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.[63]

Submarine eruptions
Main article: Submarine eruption
Pillow basalts on the south Pacific seafloor
Pillow basalts
Main article: Pillow lava

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 meters.[64]

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.[65]

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.[66][67]

Volcanic glass may be present, particularly as rinds on rapidly chilled surfaces of lava flows, and is commonly (but not exclusively) associated with underwater eruptions.[68]

Pillow basalt is also produced by some subglacial volcanic eruptions.[68]

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).[69] Fe- and Mn- oxidizing bacteria have been cultured from weathered submarine basalts of Loihi Seamount.[70] 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.[71]

Distribution

Basalt is the most common volcanic rock type on Earth, being a key component of oceanic crust as well as the principal volcanic rock in many mid-oceanic islands, including Iceland, the islands of Hawaiʻi,[31] the Faroe Islands,[72] and Réunion.[73] On Earth, most basalt magmas have formed by decompression melting of the mantle.[74] Basalt commonly erupts on Io (the third largest moon of Jupiter),[75] and has also formed on the Moon, Mars, Venus, and the asteroid Vesta.

The crustal portions of oceanic tectonic plates are composed predominantly of basalt, produced from upwelling mantle below the ocean ridges.[76]

Paraná Traps, Brazil

Basalt is one of the most common rock types in the world. Basalt is the rock most typical of large igneous provinces. The largest occurrences of basalt are in the ocean floor that is almost completely made up by basalt.[76] Above sea level basalt is common in hotspot islands[38] and around volcanic arcs, specially those on thin crust.[77] However, the largest volumes of basalt on land correspond to continental flood basalts. Continental flood basalts are known to exist in 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, the Columbia River Plateau of Washington and Oregon.[78]

Many archipelagoes and island nations have an overwhelming majority of their exposed bedrock made up of basalt due to being above hotspots, for example, Iceland and Hawaiʻi.[38]

Ancient Precambrian basalts are usually only found in fold and thrust belts, and are often heavily metamorphosed. These are known as greenstone belts,[79] because low-grade metamorphism of basalt produces chlorite, actinolite, epidote and other green minerals.[80]

Lunar and Martian basalt
Lunar olivine basalt collected by Apollo 15.

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.[39]

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),[81] 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.[82]

Lunar basalts show exotic textures and mineralogy, particularly shock metamorphism, lack of the oxidation typical of terrestrial basalts, and a complete lack of hydration.[39] 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.[83]

Basalt is also a common rock on the surface of Mars, as determined by data sent back from the planet's surface,[84] and by Martian meteorites.

Alteration of basalt

Metamorphism
Metamorphosed basalt from an Archean greenstone belt in Michigan, US. The minerals that gave the original basalt its black colour have been metamorphosed into green minerals.

Basalts are important rocks within metamorphic belts, as they can provide vital information on the conditions of metamorphism within the belt.[80]

Metamorphosed basalts are important hosts for a variety of hydrothermal ore deposits, including gold deposits, copper deposits, volcanogenic massive sulfide ore deposits and others.[85]

Weathering
Main article: Weathering

Compared to other rocks found on Earth's surface, basalts weather relatively fast. The typically iron-rich minerals oxidise rapidly in water and air, staining the rock a brown to red colour due to iron oxide (rust).[22][23][24][25] Chemical weathering also releases readily water-soluble cations such as calcium, sodium and magnesium, which give basaltic areas a strong buffer capacity against acidification.[86] Calcium released by basalts binds CO2 from the atmosphere forming CaCO3 acting thus as a CO2 trap.[87]

Uses

Basalt is used in construction (e.g. as building blocks or in the groundwork),[88] making cobblestones (from columnar basalt)[89] and in making statues.[90][91] Heating and extruding basalt yields stone wool, which as potential to be an excellent thermal insulator.[92][93][94][95]

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.[96]

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See also
  • 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
  • Flood basalt – The result of a very large volume eruption of basalt lava
  • Igneous rock – Rock formed through the cooling and solidification of magma or lava
  • Mafic – Silicate mineral or igneous rock that is rich in magnesium and iron
  • Polybaric melting
  • 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 planetary-mass object that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface

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Further reading
  • 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 9780582230804.
  • Siegesmund, Siegfried; Snethlage, Rolf, eds. (2013). Stone in architecture properties, durability (3rd ed.). Springer Science & Business Media. ISBN 978-3662100707.
  • 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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