气候变化领域集成服务门户(CCPortal): Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region; India

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DOI	10.1016/j.palaeo.2018.11.030
	Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region; India
	Stebbins A.; Williams J.; Brookfield M.; Nye S.W.; Jr; Hannigan R.
发表日期	2019
ISSN	0031-0182
起始页码	1
结束页码	10
卷号	516
英文摘要	In this study, we reconstruct water-column oxygen availability during the deposition of Late Permian shales (Wuchiapingian to approximately early Changhsingian) using the geochemistry and morphology of sedimentary pyrite (FeS2). Deposition of the shales occurred prior to the end-Permian mass extinction within the southern Neo-Tethys Ocean (Spiti region, Himachal Pradesh, India). We found that the variability of pyritic sulfur to organic carbon (Spyr/Corg) and the pyritic sulfur isotopic composition (δ34Spyr) did not record changes in oxygen availability at Spiti sections. This was due to the removal of original pyritic sulfur by modern oxidative weathering and diagenetic pyrite formation which overwhelmed the original δ34Spyr values. However, pyrite framboid size distributions was a reliable recorder of paleoredox conditions. The degree of oxygen limitation varied with multiple transient euxinic events interrupting a predominantly oxic-dysoxic trend near the top of the Gungri Formation upper member (approximately late Wuchiapingian to early Changhsingian). These transient euxinic intervals provide important insight and regional evidence of environmental stress and instability in the southern Neo-Tethys well prior to the end-Permian mass extinction. © 2018 Elsevier B.V.
英文关键词	End-Permian mass extinction; Framboid size distributions; Microbial sulfate reduction; Pyrite; Sulfur isotopes
语种	英语
scopus关键词	antimicrobial activity; chemical weathering; environmental stress; euxinic environment; isotopic composition; mass extinction; oxidation; Paleozoic; Permian; pyrite; redox conditions; reduction; shale; size distribution; sulfate; Tethys; water column; Himachal Pradesh; India; Spiti Valley
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151103
作者单位	School for the Environment, University of Massachusetts Boston, Boston, MA 02125, United States; Department of Geology, Kent State University, Kent, OH 44242, United States
推荐引用方式 GB/T 7714	Stebbins A.,Williams J.,Brookfield M.,et al. Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region; India[J],2019,516.
APA	Stebbins A.,Williams J.,Brookfield M.,Nye S.W.,Jr,&Hannigan R..(2019).Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region; India.Palaeogeography, Palaeoclimatology, Palaeoecology,516.
MLA	Stebbins A.,et al."Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region; India".Palaeogeography, Palaeoclimatology, Palaeoecology 516(2019).