Platinum-group elements of the Meishan Permian-Triassic boundary section: Evidence for flood basaltic volcanism

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	Platinum-group elements of the Meishan Permian-Triassic boundary section: Evidence for flood basaltic volcanism
	Xu, Lin ; Lin, Yangtin ; Shen, Wenjie ; Qi, Liang ; Xie, Liewen ; Ouyang, Ziyuan
刊名	CHEMICAL GEOLOGY
	2007-11-30
卷号	246 期号:1-2 页码:55-64
关键词	mass extinction Permian-Triassic boundary event platinum-group elements extraterrestrial impact Basaltic volcanism
英文摘要	Permian-Triassic boundary sections record the most severe mass extinction event in geological history. However, there is a long-standing controversy of whether bolide impact and/or basaltic flood volcanism triggered the mass extinction. Platinum-group elements (PGEs) are enriched in most extraterrestrial materials, but highly depleted in the terrestrial crust materials. We analyzed Ir, Ru, Rh, Pt and Pd in a set of samples from the global stratotype section and point (GSSP) of the Permian-Triassic boundary at Meishan, China, using isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) and nickel sulfide fire assay (NiS-FA) combined with TO coprecipitation. The samples have no Ir anomaly (5-53 pg/g), and their PGE patterns normalized to chondrites are highly fractionated with Ir/Pd ratios of 0.02-0.03 x CI, distinct from most extraterrestrial materials. In contrast, these patterns are closely parallel to those of the Siberian and probably Emeishan flood basalts, suggestive of possible sources of PGEs from the basalts. The abundances of PGEs increase in order of the pyrite lamina on the top of bed 24, bed 25 and bed 26, and then decrease to bed 28, probably indicative of a maximum eruption of the flood basalts during deposition of bed 26. The new data favor massive volcanism, rather than extraterrestrial impact, as a major cause of the Permian-Triassic boundary mass extinction. (c) 2007 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000251479300004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7192]
专题	国家天文台_院士
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospheric Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China
推荐引用方式 GB/T 7714	Xu, Lin,Lin, Yangtin,Shen, Wenjie,et al. Platinum-group elements of the Meishan Permian-Triassic boundary section: Evidence for flood basaltic volcanism[J]. CHEMICAL GEOLOGY,2007,246(1-2):55-64.
APA	Xu, Lin,Lin, Yangtin,Shen, Wenjie,Qi, Liang,Xie, Liewen,&Ouyang, Ziyuan.(2007).Platinum-group elements of the Meishan Permian-Triassic boundary section: Evidence for flood basaltic volcanism.CHEMICAL GEOLOGY,246(1-2),55-64.
MLA	Xu, Lin,et al."Platinum-group elements of the Meishan Permian-Triassic boundary section: Evidence for flood basaltic volcanism".CHEMICAL GEOLOGY 246.1-2(2007):55-64.