| 词条 | Emeishan Traps |
| 释义 |
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.[1] It is named for Emeishan, a mountain in Sichuan. {{TOC right}}The TrapsThe eruptions that produced the Emeishan Traps began 265 million years ago (Ma) or earlier.[2][3] The main eruptive period is between 262 Ma and 261 Ma, and the volcanism activities end 259 Ma.[4][5] 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. 252 Ma. The Emeishan basalts covers an area of more than 2.5 × 105 km2 with thicknesses ranging from several hundred meters up to 5.5 km (the average flood basalt thickness throughout the entire region is estimated to be ~700 m), but the Emeishan traps may have initially covered an area as much as 5 × 105 km2.[6] Thus the entire volume of the Emeishan basalts is estimated to be 0.3 × 106 km3.[7] Evidence suggests that the initial volcanism of the central Emeishan Traps occurred in a deep submarine environment without any significant pre-volcanic uplift.[8] The Emeishan Traps are associated with the end-Guadalupian extinction or end-Capitanian extinction event, the extinction of animal and plant life that occurred at the end of the Capitanian stage of the Guadalupian epoch of the Permian period.[9] Limestone within the traps show the extinction to occur immediately below the first eruptive unit, with the mass extinction marked at the onset of explosive Emeishan volcanism.[2] The formation of volcaniclastics suggest violent phreatomagmatic-style eruptions.[3] The synchrony between the Emeishan Traps and the end-Guadalupian extinction has been taken to support the argument of Vincent Courtillot and others, that volcanism is the main driver of mass extinctions.[10] See also
Notes1. ^{{cite journal|last1 = Bond|first1 = D. P. G.|last2 = Wignall|first2 = P. B.|last3 = Joachimski|first3 = M. M.|last4 = Sun|first4 = Y.|last5 = Savov|first5 = I.|last6 = Grasby|first6 = S. E.|last7 = Beauchamp|first7 = B.|last8 = Blomeier|first8 = D. P. G.|title = An abrupt extinction in the Middle Permian (Capitanian) of the Boreal Realm (Spitsbergen) and its link to anoxia and acidification|journal = Geological Society of America Bulletin|date = 2015-04-14|issn = 0016-7606|doi = 10.1130/B31216.1|volume=127|issue = 9–10|pages=1411–1421|bibcode = 2015GSAB..127.1411B}} 2. ^1 {{Cite journal|url = |title = Volcanism, Mass Extinction, and Carbon Isotope Fluctuations in the Middle Permian of China|last = Wignall|first = PB|display-authors=etal|date = 2009|journal = Science|doi = 10.1126/science.1171956|pmid = 19478179|access-date =|volume=324|issue = 5931|pages=1179–82|bibcode =2009Sci...324.1179W}} 3. ^1 {{Cite journal|url = http://eprints.whiterose.ac.uk/87198/2/Wet-LIPs-Emeishan%20Final.pdf|title = Submarine palaeoenvironments during Emeishan flood basalt volcanism, SW China: Implications for plume–lithosphere interaction during the Capitanian, Middle Permian ('end Guadalupian') extinction event|last = Jerram|first = DA|display-authors=etal|date = 2015|journal = Palaeogeography, Palaeoclimatology, Palaeoecology|volume = 441|pages = 65–73|doi =10.1016/j.palaeo.2015.06.009 }} 4. ^{{Cite journal|url = |title = Magnetostratigraphic constraints on two‐stage eruptions of the Emeishan continental flood basalts|last = Zheng|first = LD|display-authors=etal|date = 2010|journal = Geochemistry, Geophysics, Geosystems|doi = 10.1029/2010GC003267|pmid = |access-date =|bibcode=2010GGG....1112014Z|volume=11|issue = 12|pages = Q12014}} 5. ^{{Cite journal|title = CA-TIMS zircon U–Pb dating of felsic ignimbrite from the Binchuan section: Implications for the termination age of Emeishan large igneous province|last = Zhong|first = YT|display-authors=etal|date = 2014|journal = Lithos |volume = 204|pages = 14–19|doi = 10.1016/j.lithos.2014.03.005 |bibcode = 2014Litho.204...14Z}} 6. ^{{Cite journal|doi = 10.1016/s0012-821x(01)00608-2|title = A temporal link between the Emeishan large igneous province (SW China) and the end-Guadalupian mass extinction|authorlink1=Mei-Fu Zhou|last = Zhou|first = MF|display-authors=etal|date = 2002|journal = Earth and Planetary Science Letters|pmid = |access-date =|volume=196|issue = 3–4|pages=113–122|bibcode =2002E&PSL.196..113Z}} 7. ^{{Cite journal|url = http://www.sciencedirect.com/science/article/pii/S0024493704003196|title = Emeishan large igneous province, SW China|last = Ali|first = JR|display-authors=etal|date = 2005|journal = Lithos|doi = 10.1016/j.lithos.2004.09.013|pmid = |access-date =|volume=79|issue = 3–4|pages=475–489|bibcode =2005Litho..79..475A}} 8. ^{{Cite journal|url = |title = No pre-eruptive uplift in the Emeishan large igneous province: New evidences from its 'inner zone', Dali area, Southwest China|last = Zhu|first = B|display-authors=etal|date = 2014|journal = Journal of Volcanology and Geothermal Research|volume = 269|pages = 57–67|doi = 10.1016/j.jvolgeores.2013.11.015 |bibcode = 2014JVGR..269...57Z}} 9. ^{{Cite journal|url = |title = Large igneous provinces and mass extinctions|last = Wignall|first = PB|display-authors=etal|date = 2001|journal = Earth-Science Reviews|volume = 53|issue = 1|pages = 1–33|doi = 10.1016/s0012-8252(00)00037-4|pmid = |access-date = |bibcode = 2001ESRv...53....1W}} 10. ^{{Cite journal|url = |title = On the ages of flood basalt events|last = Courtillot|first = VE|display-authors=etal|date = 2003|journal = Comptes Rendus Geoscience|doi = |pmid = |access-date = }} References
External links
4 : Large igneous provinces|Permian volcanism|Geography of Sichuan|Volcanism of China |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。