globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.02.035
论文题名:
Oceanic environmental changes on a shallow carbonate platform (Yangou, Jiangxi Province, South China) during the Permian-Triassic transition: Evidence from rare earth elements in conodont bioapatite
作者: Li Y.; Zhao L.; Chen Z.-Q.; Algeo T.J.; Cao L.; Wang X.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
语种: 英语
英文关键词: Ce anomaly ; Chemical index of alteration ; Chemical weathering ; Mass extinction ; Ocean redox ; REEs
英文摘要: Paleoceanic environmental stresses (e.g., expanded anoxia, elevated siliciclastic fluxes) are thought to have been important factors in the latest Permian mass extinction (LPME). Here, we investigate changes in redox conditions and siliciclastic fluxes during the Permian-Triassic transition in South China through in-situ analysis of the rare earth element (REE) composition of albid crowns of single conodont elements measured using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). For comparison, we also analyzed REEs in the sediment matrix enclosing the conodonts (i.e., whole-rock samples). The study locale (Yangou) was located on a shallow carbonate platform on the eastern margin of the Yangtze Platform to minimize the influence of detrital siliciclastics and, thus, enhance the chances of recovering a hydrogenous (seawater-sourced) REE signal.The analyzed conodonts exhibit REE patterns consistent with mixed hydrogenous (seawater) and lithogenous (siliciclastic) sources, with specimens from below the LPME horizon showing dominantly hydrogenous influences (Y/Ho >. 50) and those from above the LPME horizon showing dominantly lithogenous influences (Y/Ho <. 50). Locally elevated Ce/Ce* ratios and U concentrations in pre-LPME conodonts suggest an episodic shoaling of the oceanic chemocline, causing incursions of suboxic to anoxic seawaters onto the shallow Yangou carbonate platform. Chemical index of alteration (CIA) values increase sharply at the LPME, suggesting increased rates of continental erosion and a relative increase in chemical over physical weathering, possibly as a consequence of globally elevated temperatures. The present case study confirms that conodonts from relatively clean, low-clay (Al <. 0.5%) carbonate facies can potentially preserve original seawater REE signatures. © 2017 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68430
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA

Recommended Citation:
Li Y.,Zhao L.,Chen Z.-Q.,et al. Oceanic environmental changes on a shallow carbonate platform (Yangou, Jiangxi Province, South China) during the Permian-Triassic transition: Evidence from rare earth elements in conodont bioapatite[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Li Y.]'s Articles
[Zhao L.]'s Articles
[Chen Z.-Q.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Li Y.]'s Articles
[Zhao L.]'s Articles
[Chen Z.-Q.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Li Y.]‘s Articles
[Zhao L.]‘s Articles
[Chen Z.-Q.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.