Pyrite framboids in the Pennian-Triassic boundary section at Meishan, China: Evidence for dysoxic deposition

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	Pyrite framboids in the Pennian-Triassic boundary section at Meishan, China: Evidence for dysoxic deposition
	Sung, YG; Shen, WJ; Lin, YT; Xu, L; Li, JF; Wu, YS; Linyt@mail.iggcas.ac.cn
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2007
卷号	253 期号:40606 页码:323-331
关键词	Pennian-triassic Boundary Pyrite Framboid Dysoxia Mass Extinction
ISSN号	0031-0182
英文摘要	Pyrite framboid evidence from the Permian-Triassic global stratotype at Meishan, China, indicates the late Permian mass extinction is closely associated with a dramatic decline of benthic oxygen levels. Sizes and abundances of the framboids were determined from acid residues and in situ on polished sections of the samples. The framboids are abundant in the thin pyrite lamina on the top of Bed 24e (the upper layer of Bed 24), and Beds 25, 26 and 29, rare in Bed 24e and Bed 28, but absent in Bed 27. They have narrow size distributions with average diameters from 4.6 mu m to 8.7 mu m which are similar to those formed under anoxic/dysoxic conditions. The abundances and mean diameters of the pyrite framboids indicate redox conditions of deposition changing from upper dysoxia (Bed 24e) and lower dysoxia (pyrite lamina, Beds 25 and 26) to oxygenation (Bed 27), and again to upper dysoxia (Bed 28) and lower dysoxia (Bed 29). Our discovery confirms a worldwide dysoxic marine event during the Permian-Triassic transition, suggestive of a direct relationship with the Permian-Triassic marine mass extinction. (c) 2007 Elsevier B.V. All rights reserved.
学科主题	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
URL标识	查看原文
资助项目	LMB
WOS记录号	WOS:000250255400005
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4912]
专题	南海海洋研究所_中科院海洋生物资源可持续利用重点实验室
通讯作者	Linyt@mail.iggcas.ac.cn
推荐引用方式 GB/T 7714	Sung, YG,Shen, WJ,Lin, YT,et al. Pyrite framboids in the Pennian-Triassic boundary section at Meishan, China: Evidence for dysoxic deposition[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2007,253(40606):323-331.
APA	Sung, YG.,Shen, WJ.,Lin, YT.,Xu, L.,Li, JF.,...&Linyt@mail.iggcas.ac.cn.(2007).Pyrite framboids in the Pennian-Triassic boundary section at Meishan, China: Evidence for dysoxic deposition.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,253(40606),323-331.
MLA	Sung, YG,et al."Pyrite framboids in the Pennian-Triassic boundary section at Meishan, China: Evidence for dysoxic deposition".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 253.40606(2007):323-331.