Early Jurassic anoxic conditions and organic accumulation in the eastern Tethys

doi:10.1080/00206814.2014.945103

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	Early Jurassic anoxic conditions and organic accumulation in the eastern Tethys
	Fu, Xiugen 1; Tan, Fuwen 1; Feng, Xinglei ; Wang, Dong ; Chen, Wenbin ; Song, Chunyan 1; Zeng, Shengqiang
刊名	INTERNATIONAL GEOLOGY REVIEW
	2014
卷号	56 期号:12 页码:1450-1465
关键词	Early Jurassic anoxia Tethys organic accumulation primary productivity oil shale
ISSN号	0020-6814
DOI	10.1080/00206814.2014.945103
英文摘要	The Bilong Co oil shale, located in the South Qiangtang depression, northern Tibet Plateau, may record the Early Jurassic anoxic event in the eastern Tethys. New geochemical data from the Bilong Co oil shale section are presented in order to determine the mechanism of organic accumulation and to evaluate Early Jurassic anoxia in the eastern Tethys. In organic-ich oil shales, many redox proxies including the relationship of Mo to total organic carbon (TOC), Re/Mo ratios, and pyrite framboid size distribution suggest deposition under euxinic conditions. However, the correlation between TOC and P and Mo contents indicates that organic matter accumulation was controlled mainly by primary productivity. The Sr/Al ratios and clastic influx proxies such as Si, Ti, Th, Zr, and Al concentrations suggest a continuous supply of fresh water from a nearby continent during oil shale deposition. This supply could have initiated stratification of the water so that the upper zone became favourable for marine life. Increased primary productivity could have led to formation of anoxic/sulphidic bottom waters, which enhanced the preservation of organic matter. Deposition of organic-rich oil shales terminated when primary productivity decreased, leading to more oxic bottom water conditions.
学科主题	地层学与地史学
WOS关键词	CARBON-ISOTOPE EXCURSION ; BLACK SHALE DEPOSITION ; NORTHERN TIBET ; REDOX CONDITIONS ; QIANGTANG BASIN ; OIL-SHALE ; GEOCHEMICAL CHARACTERISTICS ; ENVIRONMENTAL-CHANGES ; TECTONIC EVOLUTION ; PHOSPHORUS CYCLE
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000341024800002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40346]
专题	中国地质调查局成都地质调查中心
作者单位	1.Chengdu Inst Geol & Mineral Resources, Chengdu, Peoples R China 2.Minist Land & Resources, Key Lab Sedimentary Basin & Oil & Gas Resources, Chengdu, Peoples R China
推荐引用方式 GB/T 7714	Fu, Xiugen,Tan, Fuwen,Feng, Xinglei,et al. Early Jurassic anoxic conditions and organic accumulation in the eastern Tethys[J]. INTERNATIONAL GEOLOGY REVIEW,2014,56(12):1450-1465.
APA	Fu, Xiugen.,Tan, Fuwen.,Feng, Xinglei.,Wang, Dong.,Chen, Wenbin.,...&Zeng, Shengqiang.(2014).Early Jurassic anoxic conditions and organic accumulation in the eastern Tethys.INTERNATIONAL GEOLOGY REVIEW,56(12),1450-1465.
MLA	Fu, Xiugen,et al."Early Jurassic anoxic conditions and organic accumulation in the eastern Tethys".INTERNATIONAL GEOLOGY REVIEW 56.12(2014):1450-1465.