Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China

doi:10.1016/j.jseaes.2016.08.019

	Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China
	Yeasmin, Rumana 1,2; Chen, Daizhao 1; Fu, Yong 3; Wang, Jianguo 1; Guo, Zenghui 1; Guo, Chuan 1
	2017-02-01
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	134 页码:365-386
文章类型	Article
摘要	The organic-rich sediments were widely deposited over the entire Yangtze Block during the Early Cambrian (late Nemakit-Daldynian to Botomian). In the mid-upper Yangtze region, northeastern Guizhou, South China, they comprise, in ascending order, the Niutitang, Jiumenchong and lower Bianmachong formations which are dominated by black shales except the middle one characterized by interbedded shales-limestones. Three third-order depositional sequences are identified in the two studied sections located on the upper slope to basin of the open shelf. The organic-rich sediments were mostly deposited notably during transgressions on the shallower upper slope-margin (TOC up to 25 wt.%) where they are characterized by co-increases in C, P, Fe, and Ba concentrations, indicating the highest organic productivity and coupled C, P and Fe cycling there. In contrast, in the shelf basin, the concomitant organic-rich sediments yield lower organic (TOC <10 wt.% mostly) and Ba abundances, and generally show antithetic relationship of TOC with P and Fe variations, indicative of a relatively low organic productivity and transient decoupled C, P and Fe cycling in the deeper basin. This spatial difference in C, P, Fe and Ba cycling as a whole thus indicate that the highest organic productivity wedge on the shallower shelf upper slope-margin was likely induced by the oceanic upwelling from the restricted basin where the P and Fe nutrients were transiently depleted without timely renewal. Meanwhile, multiple redox proxies, including V/Al, Ni/Al and Cr/Al ratios vs. TOC contents, together with V/(V + Ni) and V/Cr ratios, generally characterize a more severe euxinic water wedge localized on the shallower upper slope-margin of shelf where the organic production culminated, but a nonsulfidic (ferruginous) anoxic state in the basin due to the relatively low sulfate level. Meanwhile, episodic depletion of trace elements in the deeper basin during the higher organic productivity also reconciles the concomitantly enhanced upwelling from the somewhat restricted deep watermass likely silled by the underwater upland seaward. The coincidence of organic-rich intervals with more arid climate epoches, as shown by increased Ti/Al ratios indicative of increased aeolian fluxes, reconciles a subtropical arid climate of Yangtze Block within the north mid-low-latitude trade-wind zone during deposition (the Early Cambrian). As such, enhanced offshore currents driven by the trade winds could have further induced the upwelling of nutrient-rich deep waters along the shelf during the transgressions, although tended to wane onwards, leading to the tempo-spatial heterogeneities in organic production and redox state across the shelf sea. (C) 2016 Elsevier Ltd. All rights reserved.
关键词	Early Cambrian Organic Enrichment Primary Productivity And Redox State Oceanic Upwelling Climatic-oceanic Forcing Yangtze Block
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1016/j.jseaes.2016.08.019
资助者	National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907) ; National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907) ; National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907) ; National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907)
关键词[WOS]	MARINE BIOGEOCHEMICAL CYCLES ; BIOGENIC BARIUM FLUXES ; GULF-OF-CALIFORNIA ; PB ZIRCON AGES ; BLACK SHALES ; SEDIMENTARY-ROCKS ; CATHAYSIA BLOCKS ; DEEP-WATER ; ELEMENT GEOCHEMISTRY ; CARBON PRESERVATION
收录类别	SCI
语种	英语
资助者	National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907) ; National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907) ; National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907) ; National Natural Science Foundation of China (NSFC)(41472089 ; Organization for Women in Science for the Developing World (OWSD) ; Swedish International Development Cooperation Agency (Sida)(3240237378) ; 40839907)
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000392767200026
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.iggcas.ac.cn/handle/132A11/52910
专题	油气资源研究院重点实验室
通讯作者	Chen, Daizhao
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.Jahangirnagar Univ, Dept Geol Sci, Dhaka 1342, Bangladesh 3.Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550012, Peoples R China
推荐引用方式 GB/T 7714	Yeasmin, Rumana,Chen, Daizhao,Fu, Yong,et al. Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,134:365-386.
APA	Yeasmin, Rumana,Chen, Daizhao,Fu, Yong,Wang, Jianguo,Guo, Zenghui,&Guo, Chuan.(2017).Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China.JOURNAL OF ASIAN EARTH SCIENCES,134,365-386.
MLA	Yeasmin, Rumana,et al."Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China".JOURNAL OF ASIAN EARTH SCIENCES 134(2017):365-386.