Jurassic black shales facies from qiangtang basin (Northern Tibet): Rare Earth and trace elements for paleoceanographic implications

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Title:	Jurassic black shales facies from qiangtang basin (Northern Tibet): Rare Earth and trace elements for paleoceanographic implications
Authors:	林殿順;Lan, CHEN;Haisheng, YI;Louis Loung-Yie, TSAI;Guiwen, XU;Xuejuan, DA;Andrew Tien-Shun, LIN
Contributors:	地球科學學院地球科學學系
Keywords:	Anoxic conditions;black shale facies;Chromium;Earth;Geologists;Jurassic;Marine;Mineralogy;Nickel;northern Tibet;paleoceanography;rare earth and trace elements;Rare earth elements;Rare earth metals;Sea level rise;Shale;Shales;Surface water;Trace elements;Uranium
Date:	2013-01-01
Issue Date:	2026-04-23 11:37:09 (UTC+8)
Publisher:	Science Press;Oxford, UK: Blackwell Publishing Ltd
Abstract:	摘要： : The Biluo Co and Amdo 114 station, northern Tibet, cropping out the Early Toarcian and Middle‐Late Tithonian (Jurassic) organic‐rich black shales, have been a focus to petroleum geologists in discussing their oil‐producing potential. This paper first reports the trace elements and rare earth elements to discuss the paleoenvironments, redox conditions and sedimentary mechanisms of those black shales. Both sections exhibit variation in trace element abundances with concentrations <0.1 ppm to 760 ppm, mostly enriched in V, Cr, Ni, Cu, Zn, Mo, Ba and U. Element ratios of Ni/Co, V/Cr, U/Th and V/(V+Ni) plus U were used to identify redox conditions. The shale‐normalized rare earth element (REE) patterns are characterized by the flat‐shale type with instable Ce anomalies and very weekly positive Eu anomalies. Positive Ceanom values are significant with values varying between −0.064 and 0.029 in Biluo Co, which may be interpreted as release of REE and input of riverine terrestrial matter with rich Ce (resulting in pH change) during the anoxic conditions. In the middle parts of Amdo 114 station, distinct negative Ceanom values are observed (−0.238 to −0.111) and associated surface water warming were interpreted as being related to a major sea level rise. In contrast, the formation of the black shales in the lower and upper part of the studied succession took place during a cooler (Ceanom values >−0.10), lower surface water productivity, and lower sea‐level stage. Thus, we emphasize the role of different factors that control the formation of local and regional black shales. The most important factors are sea‐level fluctuations and increasing productivity. 出版者： Oxford, UK: Blackwell Publishing Ltd 出版日期： 2013-04 出處： Acta geologica Sinica (Beijing), 2013-04, Vol.87 (2), p.540-554 資源來源： China Online Journals (COJ) 版權： 2013 Geological Society of China 版權： Copyright © Wanfang Data Co. Ltd. All Rights Reserved. 識別號： ISSN: 1000-9515 識別號： EISSN: 1755-6724 識別號： DOI: 10.1111/1755-6724.12067
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