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Flood basalt

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Moses Couleein the US showing multiple flood basalt flows of theColumbia River Basalt Group.The upper basalt is Roza Member, while the lowercanyonexposes Frenchmen Springs Member basalt

Aflood basalt(orplateau basalt[1]) is the result of a giantvolcanic eruptionor series oferuptionsthat covers large stretches of land or theoceanfloor withbasaltlava.Many flood basalts have been attributed to the onset of ahotspotreaching the surface of the Earth via amantle plume.[2]Flood basalt provincessuch as theDeccan Trapsof India are often calledtraps,after the Swedish wordtrappa(meaning "staircase" ), due to the characteristic stairstepgeomorphologyof many associated landscapes.

Michael R. RampinoandRichard Stothers(1988) cited eleven distinct flood basalt episodes occurring in the past 250 million years, creatinglarge igneous provinces,lava plateaus,andmountain ranges.[3]However, more have been recognized such as the largeOntong Java Plateau,[4]and theChilcotin Group,though the latter may be linked to theColumbia River Basalt Group.

Large igneous provinces have been connected to fivemass extinctionevents,[5]and may be associated withbolideimpacts.[6]

Description[edit]

Ethiopian Highlandsbasalt
Ages of flood basalt events and oceanic plateaus.[7]

Flood basalts are the most voluminous of allextrusive igneous rocks,[8]forming enormous deposits ofbasalticrock[9][10]found throughout the geologic record.[9][11]They are a highly distinctive form ofintraplate volcanism,[12]set apart from all other forms of volcanism by the huge volumes of lava erupted in geologically short time intervals. A single flood basalt province may contain hundreds of thousands of cubic kilometers of basalt erupted over less than a million years, with individual events each erupting hundreds of cubic kilometers of basalt.[11]This highly fluid basalt lava can spread laterally for hundreds of kilometers from its source vents,[13]covering areas of tens of thousands of square kilometers.[14]Successive eruptions form thick accumulations of nearly horizontal flows, erupted in rapid succession over vast areas, flooding the Earth's surface with lava on a regional scale.[9][15]

These vast accumulations of flood basalt constitutelarge igneous provinces.These are characterized by plateau landforms, so that flood basalts are also described asplateau basalts.Canyons cut into the flood basalts by erosion display stair-like slopes, with the lower parts of flows forming cliffs and the upper part of flows orinterbeddedlayers of sediments forming slopes. These are known in Dutch astrapor in Swedish astrappa,which has come into English astrap rock,a term particularly used in the quarry industry.[15][16]

The great thickness of the basalt accumulations, often in excess of 1,000 meters (3,000 ft),[16]usually reflects a very large number of thin flows, varying in thickness from meters to tens of meters, or more rarely to 100 meters (330 ft). There are occasionally very thick individual flows. The world's thickest basalt flow may be the Greenstone flow of theKeweenaw PeninsulaofMichigan,US, which is 600 meters (2,000 ft) thick. This flow may have been part of a lava lake the size ofLake Superior.[13]

Deep erosion of flood basalts exposes vast numbers of parallel dikes that fed the eruptions.[17]Some individual dikes in theColumbia River Plateauare over 100 kilometers (60 mi) long.[16]In some cases, erosion exposes radial sets of dikes with diameters of several thousand kilometers.[11]Sills may also be present beneath flood basalts, such as thePalisades SillofNew Jersey,US. The sheet intrusions (dikes and sills) beneath flood basalts are typicallydiabasethat closely matches the composition of the overlying flood basalts. In some cases, the chemical signature allows individual dikes to be connected with individual flows.[18]

Smaller-scale features[edit]

Flood basalt commonly displayscolumnar jointing,formed as the rock cooled and contracted after solidifying from the lava. The rock fractures into columns, typically with five to six sides, parallel to the direction of heat flow out of the rock. This is generally perpendicular to the upper and lower surfaces, but rainwater infiltrating the rock unevenly can produce "cold fingers" of distorted columns. Because heat flow out of the base of the flow is slower than from its upper surface, the columns are more regular and larger in the bottom third of the flow. The greater hydrostatic pressure, due to the weight of overlying rock, also contributes to making the lower columns larger. By analogy with Greek temple architecture, the more regular lower columns are described as thecolonnadeand the more irregular upper fractures as theentablatureof the individual flow. Columns tend to be larger in thicker flows, with columns of the very thick Greenstone flow, mentioned earlier, being around 10 meters (30 ft) thick.[19]

Another common small-scale feature of flood basalts ispipe-stem vesicles.Flood basalt lava cools quite slowly, so that dissolved gases in the lava have time to come out of solution as bubbles (vesicles) that float to the top of the flow. Most of the rest of the flow is massive and free of vesicles. However, the more rapidly cooling lava close to the base of the flow forms a thinchilled marginof glassy rock, and the more rapidly crystallized rock just above the glassy margin contains vesicles trapped as the rock was rapidly crystallizing. These have a distinctive appearance likened to a claytobacco pipestem, particularly as the vesicle is usually subsequently filled withcalciteor other light-colored minerals that contrast with the surrounding dark basalt.[20]

Petrology[edit]

At still smaller scales, thetextureof flood basalts isaphanitic,consisting of tiny interlocking crystals. These interlocking crystals give trap rock its tremendous toughness and durability.[19]Crystals ofplagioclaseare embedded in or wrapped around crystals ofpyroxeneand are randomly oriented. This indicates rapid emplacement so that the lava is no longer flowing rapidly when it begins to crystallize.[13]Flood basalts are almost devoid of largephenocrysts,larger crystals present in the lava prior to its being erupted to the surface, which are often present in other extrusive igneous rocks. Phenocrysts are more abundant in thedikesthat fed lava to the surface.[21]

Flood basalts are most oftenquartztholeiites.Olivinetholeiite (the characteristic rock ofmid-ocean ridges[22]) occurs less commonly, and there are rare cases ofalkali basalts.Regardless of composition, the flows are very homogeneous and rarely containxenoliths,fragments of the surrounding rock (country rock) that have been entrained in the lava. Because the lavas are low in dissolved gases,pyroclastic rockis extremely rare. Except where the flows entered lakes and becamepillow lava,the flows are massive (featureless). Occasionally, flood basalts are associated with very small volumes ofdaciteorrhyolite(much more silica-rich volcanic rock), which forms late in the development of a large igneous province and marks a shift to more centralized volcanism.[23]

Geochemistry[edit]

Parana traps

Flood basalts show a considerable degree of chemical uniformity across geologic time,[11]being mostly iron-rich tholeiitic basalts. Their major element chemistry is similar to mid-ocean ridge basalts (MORBs), while their trace element chemistry, particularly of therare earth elements,resembles that ofocean island basalt.[24]They typically have a silica content of around 52%. The magnesium number (themol%of magnesium out of the total iron and magnesium content) is around 55,[21]versus 60 for a typical MORB.[25]Therare earth elementsshow abundance patterns suggesting that the original (primitive) magma formed from rock of theEarth's mantlethat was nearlyundepleted;that is, it was mantle rock rich ingarnetand from which little magma had previously been extracted. The chemistry of plagioclase and olivine in flood basalts suggests that the magma was only slightly contaminated with melted rock of theEarth's crust,but some high-temperature minerals had already crystallized out of the rock before it reached the surface.[26]In other words, the flood basalt is moderatelyevolved.[24]However, only small amounts of plagioclase appear to have crystallized out of the melt.[26]

Though regarded as forming a chemically homogeneous group, flood basalts sometimes show significant chemical diversity even with in a single province. For example, the flood basalts of theParana Basincan be divided into a low phosphorus and titanium group (LPT) and a high phosphorus and titanium group (HPT). The difference has been attributed to inhomogeneity in the upper mantle,[27]butstrontium isotoperatios suggest the difference may arise from the LPT magma being contaminated with a greater amount of melted crust.[28]

Formation[edit]

Plume model of flood basalt eruption

Theories of the formation of flood basalts must explain how such vast amounts of magma could be generated and erupted as lava in such short intervals of time. They must also explain the similar compositions and tectonic settings of flood basalts erupted across geologic time and the ability of flood basalt lava to travel such great distances from the eruptive fissures before solidifying.

Generation of melt[edit]

A tremendous amount of heat is required for so much magma to be generated in so short a time.[11]This is widely believed to have been supplied by amantle plumeimpinging on the base of the Earth'slithosphere,its rigid outermost shell.[29][30][15]The plume consists of unusually hot mantle rock of theasthenosphere,the ductile layer just below the lithosphere, that creeps upwards from deeper in the Earth's interior.[31]The hot asthenosphereriftsthe lithosphere above the plume, allowing magma produced by decompressional melting of the plume head to find pathways to the surface.[32][17]

The swarms of parallel dikes exposed by deep erosion of flood basalts show that considerablecrustal extensionhas taken place. The dike swarms of west Scotland and Iceland show extension of up to 5%. Many flood basalts are associated with rift valleys, are located on passive continental plate margins, or extend intoaulacogens(failed arms oftriple junctionswhere continental rifting begins.) Flood basalts on continents are often aligned withhotspotvolcanism in ocean basins.[33]TheParaná and Etendeka traps,located in South America and Africa on opposite sides of the Atlantic Ocean, formed around 125 million years ago as the South Atlantic opened, while a second set of smaller flood basalts formed near the Triassic-Jurassic boundary in eastern North America as the North Atlantic opened.[15][16]However, the North Atlantic flood basalts are not connected with any hot spot traces, but seem to have been evenly distributed along the entire divergent boundary.[23]

Flood basalts are often interbedded with sediments, typicallyred beds.The deposition of sediments begins before the first flood basalt eruptions, so that subsidence and crustal thinning are precursors to flood basalt activity.[11]The surface continues to subside as basalt erupt, so that the older beds are often found below sea level.[17]Basalt strata at depth (dipping reflectors) have been found byreflection seismologyalong passive continental margins.[31]

Ascent to the surface[edit]

The composition of flood basalts may reflect the mechanisms by which the magma reaches the surface. The original melt formed in the upper mantle (theprimitive melt) cannot have the composition of quartz tholeiite, the most common and typically least evolved volcanic rock of flood basalts, because quartz tholeiites are too rich in iron relative to magnesium to have formed in equilibrium with typical mantle rock. The primitive melt may have had the composition ofpicrite basalt,but picrite basalt is uncommon in flood basalt provinces. One possibility is that a primitive meltstagnateswhen it reaches the mantle-crust boundary, where it is not buoyant enough to penetrate the lower-density crust rock. As a tholeiitic magma differentiates (changes in composition as high-temperature minerals crystallize and settle out of the magma) its density reaches a minimum at a magnesium number of about 60, similar to that of flood basalts. This restores buoyancy and permits the magma to complete its journey to the surface, and also explains why flood basalts are predominantly quartz tholeiites. Over half the original magma remains in the lower crust ascumulatesin a system of dikes and sills.[34][21]

As the magma rises, the drop in pressure also lowers theliquidus,the temperature at which the magma is fully liquid. This likely explains the lack of phenocrysts in erupted flood basalt. Theresorption(dissolution back into the melt) of a mixture of solid olivine, augite, and plagioclase—the high-temperature minerals likely to form as phenocrysts—may also tend to drive the composition closer to quartz tholeiite and help maintain buoyancy.[26][21]

Eruption[edit]

Once the magma reaches the surface, it flows rapidly across the landscape, literally flooding the local topography. This is possible in part because of the rapid rate of extrusion (over a cubic km per day per km of fissure length[16]) and the relatively low viscosity of basaltic lava. However, the lateral extent of individual flood basalt flows is astonishing even for so fluid a lava in such quantities.[35]It is likely that the lava spreads by a process ofinflationin which the lava moves beneath a solid insulating crust, which keeps it hot and mobile.[36]Studies of the Ginkgo flow of the Columbia River Plateau, which is 30 to 70 meters (98 to 230 ft) thick, show that the temperature of the lava dropped by just 20 °C (68 °F) over a distance of 500 kilometers (310 mi). This demonstrates that the lava must have been insulated by a surface crust and that the flow waslaminar,reducing heat exchange with the upper crust and base of the flow.[37][38]It has been estimated that the Ginkgo flow advanced 500 km in six days (a rate of advance of about 3.5 km per hour).[37]

The lateral extent of a flood basalt flow is roughly proportional to the cube of the thickness of the flow near its source. Thus, a flow that is double in thickness at its source can travel roughly eight times as far.[13]

Flood basalt flows are predominantlypāhoehoeflows, withʻaʻāflows much less common.[39]

Eruption in flood basalt provinces is episodic, and each episode has its own chemical signature. There is some tendency for lava within a single eruptive episode to become more silica-rich with time, but there is no consistent trend across episodes.[26]

Large igneous provinces[edit]

Main article:Large igneous province

Large Igneous Provinces (LIPs) were originally defined as voluminous outpourings, predominantly of basalt, over geologically very short durations. This definition did not specify minimum size, duration, petrogenesis, or setting. A new attempt to refine classification focuses on size and setting. LIPs characteristically cover large areas, and the great bulk of the magmatism occurs in less than 1 Ma. Principal LIPs in the ocean basins includeOceanic Volcanic Plateaus(OPs) andVolcanic Passive Continental Margins.Oceanic flood basaltsare LIPs distinguished fromoceanic plateausby some investigators because they do not form morphologic plateaus, being neither flat-topped nor elevated more than 200 m above the seafloor. Examples include the Caribbean, Nauru, East Mariana, and Pigafetta provinces. Continental flood basalts (CFBs) or plateau basalts are the continental expressions of large igneous provinces.[40]

Impact[edit]

Flood basalts contribute significantly to the growth of continental crust. They are also catastrophic events, which likely contributed to manymass extinctionsin the geologic record.

Crust formation[edit]

The extrusion of flood basalts, averaged over time, is comparable with the rate of extrusion of lava at mid-ocean ridges and much higher than the rate of extrusion by hotspots.[41]However, extrusion at mid-ocean ridges is relatively steady, while extrusion of flood basalts is highly episodic. Flood basalts create new continental crust at a rate of 0.1 to 8 cubic kilometers (0.02 to 2 cu mi) per year, while the eruptions that form oceanic plateaus produce 2 to 20 cubic kilometers (0.5 to 5 cu mi) of crust per year.[16]

Much of the new crust formed during flood basalt episodes takes the form ofunderplating,with over half the original magma crystallizing out as cumulates in sills at the base of the crust.[34]

Mass extinctions[edit]

Siberian Traps at Red Stones Lake

The eruption of flood basalts has been linked with mass extinctions. For example, theDeccan Traps,erupted at theCretaceous-Paleogene boundary,may have contributed to the extinction of the non-avian dinosaurs.[42]Likewise, mass extinctions at thePermian-Triassicboundary, theTriassic-Jurassicboundary, and in theToarcianAgeof theJurassiccorrespond to the ages of large igneous provinces in Siberia, the Central Atlantic Magmatic Province, and theKaroo-Ferrarflood basalt.[15]

Some idea of the impact of flood basalts can be given by comparison with historical large eruptions. The1783 eruption of Lakagígarwas the largest in the historical record, killing 75% of the livestock and a quarter of the population of Iceland. However, the eruption produced just 14 cubic kilometers (3.4 cu mi) of lava,[43][15]which is tiny compared with the Roza Member of the Columbia River Plateau, erupted in the mid-Miocene,which contained at least 1,500 cubic kilometers (360 cu mi) of lava.[10]

During the eruption of theSiberian Traps,some 5 to 16 million cubic kilometers (1.2 to 3.8 million cubic miles) of magma penetrated the crust, covering an area of 5 million square kilometres (1.9 million square miles), equal to 62% of the area of the contiguous states of the United States. The hot magma contained vast quantities ofcarbon dioxideandsulfur oxides,and released additional carbon dioxide andmethanefrom deeppetroleum reservoirsand youngercoalbeds in the region. The released gases created over 6400diatreme-likepipes,[44]each typically over 1.6 kilometres (1 mi) in diameter. The pipes emitted up to 160 trillion tons of carbon dioxide and 46 trillion tons of methane. Coal ash from burning coal beds spread toxicchromium,arsenic,mercury,andleadacross northern Canada.Evaporitebeds heated by the magma releasedhydrochloric acid,methyl chloride,methyl bromide,which damaged theozone layerand reduced ultraviolet shielding by as much as 85%. Over 5 trillion tons ofsulfur dioxidewas also released. The carbon dioxide produced extreme greenhouse conditions, with global average sea water temperatures peaking at 38 °C (100 °F), the highest ever seen in the geologic record. Temperatures did not drop to 32 °C (90 °F) for another 5.1 million years. Temperatures this high are lethal to most marine organisms, and land plants have difficulty continuing to photosynthesize at temperatures above 35 °C (95 °F). The Earth's equatorial zone became a dead zone.[45]

However, not all large igneous provinces are connected with extinction events.[46]The formation and effects of a flood basalt depend on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexistingclimate,and thebiotaresilience to change.[47]

Multiple flood basalt flows of theChilcotin Group,British Columbia,Canada
Major flood basalts,large igneous provincesandtraps;click to enlarge.

List of flood basalts[edit]

See also:List of flood basalt provincesandWorld's largest eruptions

Representative continental flood basalts and oceanic plateaus, arranged by chronological order, together forming a listing oflarge igneous provinces:[48]

Name Initial or peak activity
(Maago) 		Surface area
(in thousands of km2) 		Volume
(in km3) 		Associated event
Chilcotin Group 10 50 3300
Columbia River Basalt Group 17 160 174,300 Yellowstone Hotspot[2][49]
Ethiopia-Yemen Continental Flood Basalts 31 600 350,000
North Atlantic Igneous Province(NAIP) 56 (phase 2) 1300 6,600,000 Paleocene–Eocene Thermal Maximum[50]
Deccan Traps 66 1500 3,000,000[citation needed] Cretaceous–Paleogene extinction event
Caribbean large igneous province 95 (main phase) 2000 4,000,000 Cenomanian-Turonian boundary event(OAE 2)[50]
Kerguelen Plateau 119 1200 Aptian extinction[51]
Ontong-Java Plateau 120 (phase 1) 2000 80,000,000 Selli event(OAE 1a)[50]
High Arctic Large Igneous Province(HALIP) 120-130 1000 Selli event(OAE 1a)[52]
Paraná and Etendeka Traps 132 1500 2,300,000
Karoo and Ferrar Provinces 183 3000 2,500,000 Toarcian extinction event[53]
Central Atlantic Magmatic Province 201 11000 ~2,000,000 – 3,000,000 Triassic–Jurassic extinction event[54]
Siberian Traps 251 7000 4,000,000 Permian–Triassic extinction event[55]
Emeishan Traps 265 250 300,000 End-Capitanian extinction event[56]
Vilyuy Traps 373 320 Late Devonian extinction[57]
Southern Oklahoma Aulacogen 540 40 250,000 End-Ediacaranevent[58]
Arabian-Nubian Shield[citation needed] 850 2700
Mackenzie Large Igneous Province 1270 2700 500,000[59] Contains theCoppermine River flood basaltsrelated to theMuskox layered intrusion[60]

Elsewhere in the Solar System[edit]

Flood basalts are the dominant form of magmatism on the other planets and moons of the Solar System.[61]

Themariaon theMoonhave been described as flood basalts[62]composed of picritic basalt.[63]Individual eruptive episodes were likely similar in volume to flood basalts of Earth, but were separated by much longer quiescent intervals and were likely produced by different mechanisms.[64]

Extensive flood basalts may be present on Mars.[65]

Uses[edit]

Trap rock is the most durableconstruction aggregateof all rock types, because the interlocking crystals are oriented at random.[15]

See also[edit]

Wikimedia Commons has media related toFlood basalts.
  • Supervolcano– Volcano that has erupted 1000 cubic km of lava in a single eruption
  • Volcanic plateau– Plateau produced by volcanic activity

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