DOI: 10.1016/j.gloplacha.2012.09.001
论文题名: Rare-earth element patterns in conodont albid crowns: Evidence for massive inputs of volcanic ash during the latest Permian biocrisis?
作者: Zhao L. ; Chen Z.-Q. ; Algeo T.J. ; Chen J. ; Chen Y. ; Tong J. ; Gao S. ; Zhou L. ; Hu Z. ; Liu Y.
刊名: Global and Planetary Change
ISSN: 0921-8299
出版年: 2013
卷: 105 起始页码: 135
结束页码: 151
语种: 英语
英文关键词: Ce anomaly
; Eu anomaly
; Lanthanide series
; Mass extinction
; Meishan
; Permian-Triassic boundary
; South China
Scopus关键词: Ce anomalies
; Eu anomalies
; Mass extinction
; Meishan
; Permian-Triassic boundary
; South China
; Rare earth elements
; Seawater
; Volcanoes
; Geology
; clay mineral
; concentration (composition)
; eel
; environmental change
; histology
; marine environment
; Permian
; rare earth element
; volcanic ash
; volcanic eruption
; China
英文摘要: Rare-earth element (REE) profiles were generated from conodont bioapatite for two Permian-Triassic boundary sections in South China (Meishan and Daxiakou) in order to investigate environmental changes following the latest Permian mass extinction (LPME). REE concentrations were measured in albid crowns, the conodont histology that is densest and least susceptible to diagenetic alteration, in an effort to recover seawater REE signatures. However, an analysis of REE sources demonstrated that 80-100% of REEs in the study samples were derived from siliciclastic sources, presumably the abundant clay minerals present in the study sections. Interval I (pre-LPME) exhibited lower σREE concentrations and distinctly different REE distribution patterns than Intervals II (syn-LPME) and III (post-LPME) of the study sections. REE "fingerprinting" suggests that the latter two intervals contain a large fraction of REEs derived from volcanic clays, characterized by low Eu/Eu* and LaN/YbN and high Th/La ratios. The presence of volcanically derived REEs in post-LPME Interval III indicates that volcanic eruptions continued to spew ash for an extended interval following the boundary crisis or, perhaps more likely, that substantial ash deposits that fell on landmasses during the LPME were slowly eroded and transported to the marine environment. The most probable source of this volcanic ash is the Siberian Traps magmatic province. Ce/Ce* ratios of 0.8-1.0 around the LPME may reflect suboxic to anoxic seawater conditions, although it is uncertain whether Ce in the study sections is mainly of hydrogenous or detrital origin. © 2012 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876974562&doi=10.1016%2fj.gloplacha.2012.09.001&partnerID=40&md5=28a68ef834394f42d01cb6c62c09f5b1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11205
Appears in Collections: 全球变化的国际研究计划
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作者单位: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
Recommended Citation:
Zhao L.,Chen Z.-Q.,Algeo T.J.,et al. Rare-earth element patterns in conodont albid crowns: Evidence for massive inputs of volcanic ash during the latest Permian biocrisis?[J]. Global and Planetary Change,2013-01-01,105.