List of flood basalt provinces

Last updated

Representative continental flood basalts (also known as traps) and oceanic plateaus, together forming a listing of large igneous provinces: [1]

Contents

Era Period [lower-alpha 1] Epoch Age [lower-alpha 2] Start, mya [lower-alpha 2] EventNotes
Cenozoic [lower-alpha 3] Quaternary Holocene 0.0117 [lower-alpha 4]
Pleistocene Upper 0.126
Middle 0.781 Australasian strewnfield
Lake Bosumtwi [4]
Brunhes–Matuyama reversal (778.7 ± 1.9) [5]
Jaramillo reversal (1.07)
Calabrian 1.806*Olduvai reversal
Gelasian 2.588* Chilcotin Plateau Basalts [lower-alpha 5] Ice age
Gauss-Matuyama reversal (2.588)
Neogene Pliocene Piacenzian/Blancan 3.600* Gilbert-Gauss geomagnetic reversal (3.32)
Zanclean 5.333* Zanclean flood (5.333)
Miocene Messinian 7.246* Chilcotin Plateau Basalts [lower-alpha 5]
Tortonian 11.62*
Serravallian 13.82*
Langhian 15.97 M. Miocene disruption (14.8–14.5) [lower-alpha 6]
Columbia River Basalt Group [lower-alpha 7]
Chilcotin Plateau Basalts [lower-alpha 5]
Increased Antarctic deep waters
Yellowstone hotspot
Nördlinger Ries (14.5-14.3)
Burdigalian 20.44
Aquitanian 23.03*Shield volcanoes of Ethiopia [lower-alpha 8] Antarctic ice sheet complete
Paleogene Oligocene Chattian 28.1 Ethiopian and Yemen traps (31–30) [lower-alpha 8] Fish Canyon Tuff (27.51) [lower-alpha 9]
Rupelian 33.9* Chesapeake Bay impact crater (35.5) [lower-alpha 10] Antarctic ice sheet expands
Eocene–Oligocene extinction event
Eocene Priabonian 38.0
Bartonian 41.3
Lutetian 47.8*Antarctic ice sheet begins
Ypresian 56.0* N. Atlantic IP Phase II (56–54) [lower-alpha 11]
(Brito-Arctic province) (~56) [lower-alpha 12]
Paleocene Thanetian 59.2*
Selandian 61.6* N. Atlantic IP (62–58) [lower-alpha 11]
(Brito-Arctic province) (~61) [lower-alpha 12]
(Thulean Plateau)
Iceland hotspot [lower-alpha 13]
 
 
Danian 65.5 ± 0.3* Chicxulub Crater (65.5 ± 0.3) [lower-alpha 14]
Deccan Traps (65.5 ± 0.3) [lower-alpha 15]
Cretaceous–Paleogene extinction event
Shiva crater
Mesozoic Cretaceous Upper Maastrichtian 72.1 ± 0.2*
Campanian 83.6 ± 0.2 Caribbean LIP (76-74) [lower-alpha 16]
Caribbean LIP (82-80) [lower-alpha 16]
Santonian 86.3 ± 0.5
Coniacian 89.8 ± 0.3 High Arctic LIP (~90-80) [lower-alpha 17]
Caribbean LIP (90-88) [lower-alpha 16]
Ontong Java Plateau [lower-alpha 18]
 
Galápagos hotspot
 
Turonian 93.5 ± 0.8* Cenomanian-Turonian boundary event (91.5 ± 8.6) [lower-alpha 19]
Madagascar flood basalt (94.5±1.2)
Cenomanian 100.5*
Lower Albian c. 113.0 Kerguelen Plateau (110) [lower-alpha 20]
Rajmahal Traps (118) [lower-alpha 21]
Kerguelen hotspot
 
Aptian c. 125.0 Selli Event (~120) [lower-alpha 19]
Ontong Java Plateau (125–120) [lower-alpha 18]
 
Louisville hotspot
Barremian c. 129.4 High Arctic LIP (130-120) [lower-alpha 17]
Hauterivian c. 132.9Abor volcanics (135)Kerguelen hotspot
Valanginian c. 139.8 Paraná and Etendeka traps (138-128) [lower-alpha 22] Tristan hotspot
Berriasian c. 145.0Glaciations
End-Jurassic extinction
Jurassic Upper Tithonian 152.1 ± 0.9
Kimmeridgian 157.3 ± 1.0
Oxfordian 163.5 ± 1.0
Middle Callovian 166.1 ± 1.2
Bathonian 168.3 ± 1.3*
Bajocian 170.3 ± 1.4*
Aalenian 174.1 ± 1.0*
Lower Toarcian 182.7 ± 0.7 early Toarcian anoxic event
Karoo-Ferrar (~183) [lower-alpha 23]
Pliensbachian-Toarcian extinction
Formed as Gondwana broke up
Pliensbachian 190.8 ± 1.0*
Sinemurian 199.3 ± 0.3* C. Atlantic magmatic province
(Recurrent)(197±1) [lower-alpha 24]
Hettangian 201.3 ± 0.2* Central Atlantic magmatic province (199.5±0.5) [lower-alpha 24] Formed as Pangea broke up
Triassic–Jurassic extinction event
Triassic Upper Rhaetian c. 208.5
Norian c. 228 Wrangellia flood basalts (231–225) [lower-alpha 25]
Carnian c. 235*
Middle Ladinian c. 242*
Anisian 247.2
Lower Olenekian 251.2
Induan 252.2 ± 0.5* Siberian Traps (252.6) [lower-alpha 26] Permian–Triassic extinction event
Paleozoic Permian Lopingian Changhsingian 254.2 ± 0.1*
Wuchiapingian 259.9 ± 0.4* Emeishan Traps (258) [lower-alpha 27] end-Capitanian/Guadalupian Extinction
Guadalupian Capitanian 265.1 ± 0.4*
Wordian/Kazanian 268.8 ± 0.5*
Roadian/Ufimian 272.3 ± 0.5* Olson's Extinction
Late Devonian extinction
Cisuralian Kungurian 279.3 ± 0.6
Artinskian 290.1 ± 0.1
Sakmarian 295.5 ± 0.4
Asselian 298.9 ± 0.2* Skagerrak-Centered LIP (297±4 Ma) [lower-alpha 28] Pangaea
Carbon-
iferous
[lower-alpha 29] /
Pennsyl-
vanian
Upper Gzhelian 303.7 ± 0.1
Kasimovian 307.0 ± 0.1 Carboniferous Rainforest Collapse (~305) [lower-alpha 30]
Middle Moscovian 315.2 ± 0.2
Lower Bashkirian 323.2 ± 0.4*
Carbon-
iferous
[lower-alpha 29] /
Missis-
sippian
Upper Serpukhovian 330.9 ± 0.2
Middle Viséan 346.7 ± 0.4*
Lower Tournaisian 358.9 ± 0.4* Hangenberg event (358.9 ± 0.4) [lower-alpha 31] Late Devonian extinction
Devonian Upper Famennian 372.2 ± 1.6* Kellwasser_event (372.2 ± 1.6) [lower-alpha 32]
Viluy traps (373.4 ± 0.7) [lower-alpha 33]
Late Devonian extinction [lower-alpha 34]
Frasnian 382.7 ± 1.6*
Middle Givetian 387.7 ± 0.8*
Eifelian 393.3 ± 1.2*
Lower Emsian 407.6 ± 2.6*
Pragian 410.8 ± 2.8*
Lochkovian 419.2 ± 3.2*
Silurian Pridoli (Stage 8)423.0 ± 2.3* Lau event (423.0 ± 2.3) [lower-alpha 35]
Ludlow/Cayugan Ludfordian 425.6 ± 0.9*
Gorstian 427.4 ± 0.5* Mulde event (427.4 ± 0.5) [lower-alpha 36]
Wenlock Homerian/Lockportian 430.5 ± 0.7*
Sheinwoodian/Tonawandan 433.4 ± 0.8* Ireviken event (433.4 ± 2.3) [lower-alpha 37]
Llandovery/
Alexandrian
Telychian/Ontarian 438.5 ± 1.1*
Aeronian 440.8 ± 1.2*
Rhuddanian 443.4 ± 1.5* Ordovician–Silurian extinction event
Ordovician Upper Hirnantian 445.2 ± 1.4* Pre-Devonian Traps (~445)
Katian 453.0 ± 0.7*
Sandbian 458.4 ± 0.9*
Middle Darriwilian 467.3 ± 1.1*
Dapingian 470.0 ± 1.4*
Lower Floian
(formerly Arenig)
477.7 ± 1.4*
Tremadocian 485.4 ± 1.9*
Cambrian Furongian Stage 10 c. 489.5 Cambrian–Ordovician extinction event
Jiangshanian c. 494*
Paibian c. 497*
Series 3 Guzhangian c. 500.5*
Drumian c. 504.5*
Stage 5 c. 509
Series 2 Stage 4 c. 514
Stage 3 c. 521
Terreneuvian Stage 2 c. 529 Cambrian explosion
Fortunian 541.0 ± 1.0* End-Ediacaran extinction
Neo-
proterozoic
[lower-alpha 38]
Ediacaran c. 635* Long Range dikes (620)formed as Iapetus Ocean began
Cryogenian 850 [lower-alpha 39] Franklin LIP (716.5) Snowball Earth
Tonian 1000 [lower-alpha 39] Warakurna LIP (~1075)
Meso-
proterozoic
[lower-alpha 38]
Stenian 1200 [lower-alpha 39] Midcontinent Rift System (~1100) [lower-alpha 40]
Mackenzie LIP (~1270)
Rodinia
Ectasian 1400 [lower-alpha 39]
Calymmian 1600 [lower-alpha 39]
Paleo-
proterozoic
[lower-alpha 38]
Statherian 1800 [lower-alpha 39] Circum-Superior Belt (1884-1864) [lower-alpha 41]
Winagami sill complex (1890-1760)
Orosirian 2050 [lower-alpha 39] Kapuskasing and Marathon dike swarm (2126-2101)
Fort Frances dike swarm (2076-2067)
Vredefort impact structure (2023±4) [lower-alpha 42]
Rhyacian 2300 [lower-alpha 39] Ungava magmatic event Huronian glaciation (2220)
Siderian 2500 [lower-alpha 39] Matachewan dike swarm (2500-2450)
Mistassini dike swarm (2500)
Great Oxygenation Event
Neoarchean [lower-alpha 38] 2800 [lower-alpha 39]
Mesoarchean [lower-alpha 38] 3200 [lower-alpha 39]
Paleoarchean [lower-alpha 38] 3600 [lower-alpha 39] Kaapvaal craton (3600-3700) Vaalbara
Eoarchean [lower-alpha 38] 4000
Early Imbrian [lower-alpha 38] [lower-alpha 43] c. 3850
Nectarian [lower-alpha 38] [lower-alpha 43] c. 3920lunar basins form
Basin Groups [lower-alpha 38] [lower-alpha 43] c. 4150 Acasta Gneiss Late Heavy Bombardment
Cryptic [lower-alpha 44] c. 4600Oldest minerals. Earth surface solidifies.

See also

Footnotes

  1. Paleontologists often refer to faunal stages rather than geologic (geological) periods. The stage nomenclature is quite complex. For an excellent time-ordered list of faunal stages, see [2]
  2. 1 2 Dates are slightly uncertain with differences of a few percent between various sources being common. This is largely due to uncertainties in radiometric dating and the problem that deposits suitable for radiometric dating seldom occur exactly at the places in the geologic column where they would be most useful. The dates and errors quoted above are according to the International Commission on Stratigraphy 2012 time scale. Where errors are not quoted, errors are less than the precision of the age given. Dates labeled with a * indicate boundaries where a Global Boundary Stratotype Section and Point has been internationally agreed upon: see List of Global Boundary Stratotype Sections and Points for a complete list.
  3. Historically, the Cenozoic has been divided up into the Quaternary and Tertiary sub-eras, as well as the Neogene and Paleogene periods. The 2009 version of the ICS time chart [3] recognizes a slightly extended Quaternary as well as the Paleogene and a truncated Neogene, the Tertiary having been demoted to informal status.
  4. The start time for the Holocene epoch is here given as 11,700   years ago. For further discussion of the dating of this epoch, see Holocene.
  5. 1 2 3 Eruptions were most vigorous 6 to 10 million years ago and 2 to 3 million years ago, when most of the basalt was released. Less extensive eruptions continued 0.01 to 1.6 million years ago. The Chilcotin Group were thought to potentially be linked to the Columbia River Basalt Group in the United States, which are coeval and lie across parts of the states of Washington, Oregon, and Idaho to the south.[3] However, its morphology and geochemistry have been proven much similar to other volcanic plateaus such as the Snake River Plain in Idaho and parts of Iceland. [6] K–Ar whole-rock dates demonstrate that several ages of basalt are represented, from Early Miocene (or even Late Oligocene?) to Early Pleistocene, with particularly abundant eruptions about 14 to 16, 9 to 6, and 1 to 3 Ma ago.
  6. 14.8 to 14.5 million years ago, during the Langhian. A major and permanent cooling step occurred between 14.8 and 14.1 Ma, associated with increased production of cold Antarctic deep waters and a major growth of the East Antarctic ice sheet.
  7. The Columbia River Basalt Group is thought to be a potential link to the Chilcotin Group. The flows can be divided into four major categories: The Steens Basalt, Grande Ronde Basalt, the Wanapum Basalt, and the Saddle Mountains Basalt. The Columbia River flood basalt province comprises more than 300 individual basalt lava flows that have an average volume of 500 to 600 cubic kilometres. The Steens Basalt captured a highly detailed record of the Earth’s magnetic reversal that occurred roughly 15 million years ago. Over a 10,000 year period, more than 130 flows solidified – roughly one flow every 75 years. Most of the flows froze with a single magnetic orientation. However, several of the flows captured substantial variations in magnetic field direction as they froze. One geomagnetic field reversal occurred during the Steens Basalt eruptions at approximately 16.7 Ma, as dated using 40Ar/39Ar ages and the geomagnetic polarity timescale. The Imnaha lavas have been dated using the K–Ar technique, and show a broad range of dates. The oldest is 17.67±0.32 Ma with younger lava flows ranging to 15.50±0.40 Ma. The next oldest of the flows, from 17 million to 15.6 million years ago, make up the Grande Ronde Basalt. The Wanapum Basalt is made up of the Eckler Mountain Member (15.6 million years ago), the Frenchman Springs Member (15.5 million years ago), the Roza Member (14.9 million years ago) and the Priest Rapids Member (14.5 million years ago). The Saddle Mountains Basalt, seen prominently at the Saddle Mountains, is made up of the Umatilla Member flows, the Wilbur Creek Member flows, the Asotin Member flows (13 million years ago), the Weissenfels Ridge Member flows, the Esquatzel Member flows, the Elephant Mountain Member flows (10.5 million years ago), the Bujford Member flows, the Ice Harbor Member flows (8.5 million years ago) and the Lower Monumental Member flows (6 million years ago). Eruptions were most vigorous from 17 to 14 million years ago, when over 99% of the basalt was released. Less extensive eruptions continued from 14 to 6 million years ago.
  8. 1 2 erupted approximately 31 to 30 Mya, over a period of 1 Myr or less. This was about the time of a change to a colder and drier global climate, a major continental ice-sheet advance in Antarctica, the largest Tertiary sea-level drop and significant extinctions. [7] According to Hofmann et al. (1997),[ full citation needed ] most of the Ethiopian flood basalts erupted 30 Myr ago, during a short 1  Myr period, to form a vast volcanic plateau. Immediately after this peak of activity, a number of large shield volcanoes developed on the surface of the volcanic plateau, after which subsequent volcanism was largely confined to regions of rifting (Mohr, 1983a; Mohr & Zanettin, 1988).[ full citation needed ] The rift that opened along the Red Sea and Gulf of Aden separated the Arabian and African continents, and isolated a small portion of the volcanic plateau in Yemen and Saudi Arabia. [8] Volcanic activity continues to the present day along the Ethiopian and Afar rifts.
  9. largest known single-event volcanic eruption with a magnitude of 9.2 . It has been dated to 27.51 Ma ago. This tuff and eruption is part of the larger San Juan volcanic field and Mid-Tertiary ignimbrite flare-up.
  10. dated at 35.5 million years
  11. 1 2 Isotopic dating indicates the most active magmatic phase of the NAIP to be ca. 60.5–54.5 Ma (million years ago)[4] (mid-Paleocene to early Eocene) - further divided into Phase 1 (pre-break-up phase) dated to ca. 62–58 Ma and Phase 2 (syn-break-up phase) dated to ca. 56–54 Ma
  12. 1 2 Basaltic volcanism flowed in two main pulses. The first which occurred ~61 million years ago was of 2 to 106 km3 in total volume, into the current western and southeastern Greenland and northwestern Britain. The second and larger flood basalt flow occurred ~56 to 54 Ma years ago in both eastern Greenland and the Faroe Islands.
  13. it is speculated[ according to whom? ] that the present day Iceland hotspot originated as a mantle plume on the Alpha Ridge (Arctic Ocean) ca. 130–120 Ma, migrated down Ellesmere Island, through Baffin Island, onto the west coast of Greenland, and finally arrived on the east coast of Greenland by ca. 60 Ma
  14. The age of Chicxulub asteroid impact and the Cretaceous–Paleogene boundary (65.5 ± 0.3) coincide precisely. Even the most energetic known volcanic eruption, which released approximately 240 gigatons of TNT (1.0×1021 J) and created the La Garita Caldera, was substantially less powerful than the Chicxulub impact. Gerta Keller[ citation needed ] of Princeton University argues that recent core samples from Chicxulub prove the impact occurred about 300,000 years before the mass extinction.
  15. The Deccan Traps formed between 60 and 68 million years ago, at the end of the Cretaceous period. The bulk of the volcanic eruption occurred at the Western Ghats (near Mumbai) some 65 million years ago. This series of eruptions may have lasted less than 30,000 years in total. The motion of the Indian tectonic plate and the eruptive history of the Deccan traps show strong correlations. Based on data from marine magnetic profiles, a pulse of unusually rapid plate motion begins at the same time as the first pulse of Deccan flood basalts, which is dated at 67  Myr ago. The spreading rate rapidly increased and reached a maximum at the same time as the peak basaltic eruptions. The spreading rate then dropped off, with the decrease occurring around 63 Myr ago, by which time the main phase of Deccan volcanism ended.
  16. 1 2 3 The volcanism took place between 139 and 69 million years ago, with the majority of act1ivity appearing to lie between 95 and 88 Ma with peaks at 74-76, 80-82, and 88-90 Ma in decreasing order of importance. [9]
  17. 1 2 The HALIP is defined as a long lasting (ca. 50 Ma) diffuse volcanic period punctuated by two distinct volcanic events: the ~120-130 Ma Barremian and the ~80-90 Ma Turonian events. In this contribution, we sub-divided the HALIP into two separate LIPs: (1) the ~120-130 Ma Early Cretaceous BLIP which was related to the opening of the Canada Basin, and (2) the ~80-90 Ma Late Cretaceous SLIP which was related to the formation of the Alpha Ridge.
  18. 1 2 Although they are now separated by thousands of kilometres, Manihiki Plateau and Hikurangi Plateau were then part of the same large igneous province, forming the world's largest oceanic plateau. The Ontong Java Plateau was formed 125–120 million years ago with some secondary volcanism occurring 20–40 million years later.
  19. 1 2 Detailed stratigraphic studies of Cretaceous black shales from many parts of the world have indicated that two oceanic anoxic events were particularly significant in terms of their impact on the chemistry of the oceans, one in the early Aptian (~120 Ma), sometimes called the Selli Event (or OAE 1a) after the Italian geologist, Raimondo Selli (1916–1983), and another at the Cenomanian–Turonian boundary (~93 Ma), sometimes called the Bonarelli Event which occurred approximately 91.5 ± 8.6 million years ago. One possible cause was sub-oceanic volcanism occurring approximately 500,000 years earlier.
  20. The plateau was produced by the Kerguelen hotspot, starting with or following the breakup of Gondwana about 130 million years ago. The Kerguelen Plateau was formed starting 110 million years ago from a series of large volcanic eruptions.
  21. This volcanic rocks are formed from the eruption of Kerguelen hot spot in the early Cretaceous age. The similarity between the geochemical data of Rajmahal volcanis and lavas of the Kerguelen plateau confirms this. The lava pile of ~230 m thickness in the Rajmahal Hills, Jharkhand, and alkalic basalts in the Bengal Basin were emplaced at ~118 Ma.
  22. The original basalt flows occurred 128 to 138 million years ago. The basalt samples at Paraná and Etendeka have an age of about 132 Ma.
  23. It formed just prior to the breakup of Gondwana in the Lower Jurassic epoch, about 183 million years ago; this timing corresponds to the early Toarcian anoxic event and the Pliensbachian-Toarcian extinction.
  24. 1 2 Ages were determined by 40Ar/39Ar analysis on plagioclase (Knight et al. 2004), (Verati et al. 2007), (Marzoli et al. 2004).[ full citation needed ] These data show indistinguishable ages (199.5±0.5 Ma) from Lower to Upper lava flows, from central to northern Morocco. Therefore the CAMP is an intense and short magmatic event. Basalts of the Recurrent unit are slightly younger (mean age: 197±1 Ma) and represent a late event. According to magnetostratigraphic data, the Moroccan CAMP were divided into five groups, differing in paleomagnetic orientations(declination and inclination) (Knight et al. 2004).[ full citation needed ] Each group is composed by a smaller number of lava flows (i.e., a lower volume) than the preceding one. These data suggest that the CAMP were created by five short magma pulses and eruption events, each one possibly < 400 years (?) long. All lava flow sequences are characterized by normal polarity, except for a brief paleomagnetic reversal yielded by one lava flow and by a localized interlayered limestone in two distinct section of the High Atlas CAMP.
  25. Although composed of many different rocks types, of various composition, age, and tectonic affinity, it is the late Triassic flood basalts that are the defining unit of Wrangellia. These basalts, extruded onto land over 5 million years about ~231–225 Ma.
  26. This massive eruptive event spanned the Permian-Triassic boundary, about 250 million years ago, and is cited as a possible cause of the Permian-Triassic extinction event. The Siberian Traps are considered to have erupted via numerous vents over a period of roughly a million years or more. The source of the Siberian Traps basalt has variously been attributed to a mantle plume which impacted the base of the earth's crust and erupted through the Siberian Craton, or to processes related to plate tectonics. Another possible cause may be the impact that formed the Wilkes Land crater, which may have been contemporaneous and would have been antipodal to the Traps. However, there are already other suggested candidates for giant impacts at the Permian–Triassic boundary, for example Bedout off the northern coast of Western Australia, although all are equally contentious.
  27. The eruptions that produced the Emeishan Traps began c. 260 million years ago (Ma). In volume, the Emeishan Traps are dwarfed by the massive Siberian Traps, which occurred, in terms of the geological time scale, not long after, at c. 251 Ma. Nonetheless, the Emeishan Traps eruptions were serious enough to have global ecological and paleontological impact. The Emeishan Traps are associated with the so-called end-Guadalupian Extinction or end-Capitanian mass extinction. [10] Emeishan volcanism was active at 258–246 Ma
  28. After restoring the center of the Skagerrak-Centered Large Igneous Province (SCLIP)using a new reference frame, it has been shown that the Skagerrak plume rose from the core–mantle boundary (CMB) to its ~300 Ma position.[18] The major eruption interval took place in very narrow time interval, of 297±4 Ma. This rift formation coincides with the Moskovian/Kasimovian boundary and the Carboniferous Rainforest Collapse.
  29. 1 2 In North America, the Carboniferous is subdivided into Mississippian and Pennsylvanian (geology) Periods.
  30. occurred around 305 million years ago in the Carboniferous period.
  31. The Hangenberg event sits on or just below the Devonian/Carboniferous boundary and marks the last spike in the period of extinction. It is marked by an anoxic black shale layer and an overlying sandstone deposit.[18] Unlike the Kellwasser event, the Hangenberg event affected marine and terrestrial habitats.
  32. the extinction pulse that occurs near the Frasnian/Famennian boundary.
  33. With the K-Ar technique, ages ranging from 338 to 367 Ma with uncertainties on the order of 5 Ma were obtained. [11] With the 40Ar/39Ar technique, integrated ages range from 344 to 367 Ma, with uncertainties on the order of 1 Ma, and two samples yielded plateaus, i.e. the best determined ages, at 360.3 ± 0.9 and 370.0 ± 0.7 Ma. Three out of four ages yielded by the two separate methods are in agreement within uncertainties. One sample yields incompatible ages and could be from a later, altered dyke event. The 40Ar/39Ar plateau age of 370.0 ± 0.7 Ma (conventional calibration) or 373.4 ± 0.7 Ma (recalculated per Renne et al., 2010), the most reliable age obtained in this study, is compatible with recent determinations of the Late Devonian extinction events at the end-Frasnian (~ 376 ± 3 Ma). These results underscore a need for further work, in progress.
  34. Impact craters, such as the Kellwasser-aged Alamo and the Hangenberg-aged Woodleigh, cannot generally be dated with sufficient precision to link them to the event.
  35. The Lau event started at the beginning of the late Ludfordian, a subdivision of the Ludlow stage, about 420 million years ago. It coincided with a global low point in sea level, is closely followed by an excursion in geochemical isotopes in the ensuing late Ludfordian faunal stage and a change in depositional regime. Profound sedimentary changes occurred at the beginning of the Lau event; these are probably associated with the onset of sea level rise, which continued through the event, reaching a high point at the time of deposition of the Burgsvik beds, after the event.
  36. The Mulde event was a secundo-secundo event,[3] and marked the second of three1 relatively minor mass extinctions during the Silurian period. It coincided with a global drop in sea level, and is closely followed by an excursion in geochemical isotopes. Its onset is synchronous with the deposition of the Fröel formation in Gotland.
  37. The Ireviken event was a minor extinction event at the Llandovery/Wenlock boundary (mid Silurian, 433.4 ± 2.3 million years ago). The event lasted around 200,000 years, spanning the base of the Wenlock epoch. It comprises eight extinction "datum points"—the first four being regularly spaced, every 30,797 years, and linked to the Milankovic obliquity cycle. The fifth and sixth probably reflect maxima in the precessional cycles, with periods of around 16.5 and 19 ka. Subsequent to the first extinctions, excursions in the δ13C and δ18O records are observed; δ13C rises from +1.4‰ to +4.5‰, while δ18O increases from −5.6‰ to −5.0‰ .
  38. 1 2 3 4 5 6 7 8 9 10 The Proterozoic, Archean and Hadean are often collectively referred to as the Precambrian Time or sometimes, also the Cryptozoic.
  39. 1 2 3 4 5 6 7 8 9 10 11 12 Defined by absolute age (Global Standard Stratigraphic Age).
  40. about 1.1 billion years ago.
  41. 1,884 to 1,864 million years ago.
  42. estimated to be 2.023 billion years (±4 million years).
  43. 1 2 3 These unit names were taken from the Lunar geologic timescale and refer to geologic events that did not occur on Earth. Their use for Earth geology is unofficial. Note that their start times do not dovetail perfectly with the later, terrestrially defined boundaries.
  44. The “Cryptic era” is an informal geologic term, like the “Precambrian”. It has no official definition.

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The Siberian Traps is a large region of volcanic rock, known as a large igneous province, in Siberia, Russia. The massive eruptive event that formed the traps is one of the largest known volcanic events in the last 500 million years.

<span class="mw-page-title-main">Flood basalt</span> Very large volume eruption of basalt lava

A flood basalt is the result of a giant volcanic eruption or series of eruptions that covers large stretches of land or the ocean floor with basalt lava. Many flood basalts have been attributed to the onset of a hotspot reaching the surface of the Earth via a mantle plume. Flood basalt provinces such as the Deccan Traps of India are often called traps, after the Swedish word trappa, due to the characteristic stairstep geomorphology of many associated landscapes.

<span class="mw-page-title-main">Large igneous province</span> Huge regional accumulation of igneous rocks

A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including intrusive and extrusive, arising when magma travels through the crust towards the surface. The formation of LIPs is variously attributed to mantle plumes or to processes associated with divergent plate tectonics. The formation of some of the LIPs in the past 500 million years coincide in time with mass extinctions and rapid climatic changes, which has led to numerous hypotheses about causal relationships. LIPs are fundamentally different from any other currently active volcanoes or volcanic systems.

<span class="mw-page-title-main">Yellowstone hotspot</span> Volcanic hotspot in the United States

The Yellowstone hotspot is a volcanic hotspot in the United States responsible for large scale volcanism in Idaho, Montana, Nevada, Oregon, and Wyoming, formed as the North American tectonic plate moved over it. It formed the eastern Snake River Plain through a succession of caldera-forming eruptions. The resulting calderas include the Island Park Caldera, Henry's Fork Caldera, and the Bruneau-Jarbidge caldera. The hotspot currently lies under the Yellowstone Caldera. The hotspot's most recent caldera-forming supereruption, known as the Lava Creek Eruption, took place 640,000 years ago and created the Lava Creek Tuff, and the most recent Yellowstone Caldera. The Yellowstone hotspot is one of a few volcanic hotspots underlying the North American tectonic plate; another example is the Anahim hotspot.

<span class="mw-page-title-main">Central Atlantic magmatic province</span> Largest continental igneous province on Earth

The Central Atlantic magmatic province (CAMP) is the Earth's largest continental large igneous province, covering an area of roughly 11 million km2. It is composed mainly of basalt that formed before Pangaea broke up in the Mesozoic Era, near the end of the Triassic and the beginning of the Jurassic periods. The subsequent breakup of Pangaea created the Atlantic Ocean, but the massive igneous upwelling provided a legacy of basaltic dikes, sills, and lavas now spread over a vast area around the present central North Atlantic Ocean, including large deposits in northwest Africa, southwest Europe, as well as northeast South America and southeast North America. The name and CAMP acronym were proposed by Andrea Marzoli and adopted at a symposium held at the 1999 Spring Meeting of the American Geophysical Union.

<span class="mw-page-title-main">Central America Volcanic Arc</span> Chain of volcanoes parallel to the Pacific coastline from Mexico to Panama

The Central American Volcanic Arc is a chain of volcanoes which extends parallel to the Pacific coastline of the Central American Isthmus, from Mexico to Panama. This volcanic arc, which has a length of 1,100 kilometers is formed by an active subduction zone, with the Cocos Plate subducting underneath the Caribbean Plate. The region has been volcanically and geologically active for at least the past several million years. Numerous volcanoes are spread throughout various Central American countries; many have been active in the geologic past, some more so than others.

<span class="mw-page-title-main">La Garita Caldera</span> Large caldera in the state of Colorado, U.S.

La Garita Caldera is a large caldera and extinct supervolcano in the San Juan volcanic field in the San Juan Mountains around the town of Creede in southwestern Colorado, United States. It is west of La Garita, Colorado. The eruption that created the La Garita Caldera is among the largest known volcanic eruptions in Earth's history, as well as being one of the most powerful known supervolcanic events.

<span class="mw-page-title-main">Columbia River Basalt Group</span> Continental flood basalt province in the Western United States

The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt provinces on Earth, covering over 210,000 km2 (81,000 sq mi) mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. The basalt group includes the Steens and Picture Gorge basalt formations.

<span class="mw-page-title-main">Volcanism of Canada</span> Volcanic activity in Canada

Volcanic activity is a major part of the geology of Canada and is characterized by many types of volcanic landform, including lava flows, volcanic plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes, calderas, diatremes, and maars, along with less common volcanic forms such as tuyas and subglacial mounds.

<span class="mw-page-title-main">Geology of the Pacific Northwest</span> Geology of Oregon and Washington (United States) and British Columbia (Canada)

The geology of the Pacific Northwest includes the composition, structure, physical properties and the processes that shape the Pacific Northwest region of North America. The region is part of the Ring of Fire: the subduction of the Pacific and Farallon Plates under the North American Plate is responsible for many of the area's scenic features as well as some of its hazards, such as volcanoes, earthquakes, and landslides.

<span class="mw-page-title-main">Twin Buttes (California)</span> Group of volcanic cinder cones in Shasta County, California, United States

The Twin Buttes are two volcanic cinder cones located in the Cascade Mountain Range in Shasta County, California. They are part of the Bidwell Spring chain and lie within a region that was active in the Quaternary. Formed during the Pleistocene between 25,000 and 15,000 years ago, the volcanoes erupted lava flows that coursed toward the Burney Mountain lava dome. These lava flows cover an area of 3.9 square miles (10.1 km2) and are made of basalt and dacite. The volcanoes also erupted cinder and volcanic ash that reached eastward.

The Emeishan Traps constitute a flood basalt volcanic province, or large igneous province, in south-western China, centred in Sichuan province. It is sometimes referred to as the Permian Emeishan Large Igneous Province or Emeishan Flood Basalts. Like other volcanic provinces or "traps", the Emeishan Traps are multiple layers of igneous rock laid down by large mantle plume volcanic eruptions. The Emeishan Traps eruptions were serious enough to have global ecological and paleontological impact.

<span class="mw-page-title-main">Volcanism of Northern Canada</span> History of volcanic activity in Northern Canada

Volcanism of Northern Canada has produced hundreds of volcanic areas and extensive lava formations across Northern Canada. The region's different volcano and lava types originate from different tectonic settings and types of volcanic eruptions, ranging from passive lava eruptions to violent explosive eruptions. Northern Canada has a record of very large volumes of magmatic rock called large igneous provinces. They are represented by deep-level plumbing systems consisting of giant dike swarms, sill provinces and layered intrusions.

<span class="mw-page-title-main">Volcanic history of the Northern Cordilleran Volcanic Province</span>

The volcanic history of the Northern Cordilleran Volcanic Province presents a record of volcanic activity in northwestern British Columbia, central Yukon and the U.S. state of easternmost Alaska. The volcanic activity lies in the northern part of the Western Cordillera of the Pacific Northwest region of North America. Extensional cracking of the North American Plate in this part of North America has existed for millions of years. Continuation of this continental rifting has fed scores of volcanoes throughout the Northern Cordilleran Volcanic Province over at least the past 20 million years and occasionally continued into geologically recent times.

<span class="mw-page-title-main">Timeline of volcanism on Earth</span>

This timeline of volcanism on Earth includes a list of major volcanic eruptions of approximately at least magnitude 6 on the Volcanic explosivity index (VEI) or equivalent sulfur dioxide emission during the Quaternary period. Other volcanic eruptions are also listed.

<span class="mw-page-title-main">Canadian Cascade Arc</span> Canadian segment of the North American Cascade Volcanic Arc

The Canadian Cascade Arc, also called the Canadian Cascades, is the Canadian segment of the North American Cascade Volcanic Arc. Located entirely within the Canadian province of British Columbia, it extends from the Cascade Mountains in the south to the Coast Mountains in the north. Specifically, the southern end of the Canadian Cascades begin at the Canada–United States border. However, the specific boundaries of the northern end are not precisely known and the geology in this part of the volcanic arc is poorly understood. It is widely accepted by geologists that the Canadian Cascade Arc extends through the Pacific Ranges of the Coast Mountains. However, others have expressed concern that the volcanic arc possibly extends further north into the Kitimat Ranges, another subdivision of the Coast Mountains, and even as far north as Haida Gwaii.

<span class="mw-page-title-main">Ngaoundere Plateau</span>

The Ngaoundéré Plateau is a highland area in the Adamawa Region of Cameroon. It contains Tchabal Nganha, a large volcano, and many other recent volcanic structures.

References

  1. Courtillota, Vincent E.; Renneb, Paul R. (January 2003). "Sur l'âge des trapps basaltiques" [On the ages of flood basalt events]. Comptes Rendus Geoscience. 335 (1): 113–140. Bibcode:2003CRGeo.335..113C. doi:10.1016/S1631-0713(03)00006-3.
  2. "The Paleobiology Database". Archived from the original on 11 February 2006. Retrieved 19 March 2006.
  3. "The 2009 version of the ICS time chart" (PDF).[ full citation needed ]
  4. estimated to be 1.07 mya
  5. Bradley S. Singer; Malcolm S. Pringleb (1996). "Age and duration of the Matuyama-Brunhes geomagnetic polarity reversal from incremental heating analyses of lavas". Earth and Planetary Science Letters. 139 (1–2): 47–61. Bibcode:1996E&PSL.139...47S. doi:10.1016/0012-821X(96)00003-9. We have obtained 40Ar/39Ar isochron ages using incremental heating techniques on groundmass separates, phenocryst-poor whole rock samples, or plagioclase, from eight basaltic to andesitic lavas that erupted during the Matuyama-Brunhes (M-B) polarity transition at four geographically dispersed sites. These eight lavas range from 784.6 ± 7.1 ka to 770.8 ± 5.2 ka (1 σ errors); the weighted mean, 778.7 ± 1.9 ka, gives a high-precision age that is remarkably consistent with revised astronomical age estimates for the M-B polarity transition
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  8. (Chazot & Bertrand, 1993;[ full citation needed ] Baker et al., 1996a;[ full citation needed ] Menzies et al., 2001[ full citation needed ])
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  11. Courtillot, Vincent; Kravchinsky, Vadim A.; Quidelleur, Xavier; Renne, Paul R.; Gladkochub, Dmitry P. (2010). "Preliminary dating of the Viluy traps (Eastern Siberia): Eruption at the time of Late Devonian extinction events?". Earth and Planetary Science Letters. 300 (3–4): 239–245. Bibcode:2010E&PSL.300..239C. doi:10.1016/j.epsl.2010.09.045.