气候变化领域集成服务门户(CCPortal): Redox conditions and climate control on organic matter accumulation and depletion during the Toarcian in the Qiangtang Basin; eastern Tethys

CCPortal

DOI	10.1007/s00531-020-01884-y
	Redox conditions and climate control on organic matter accumulation and depletion during the Toarcian in the Qiangtang Basin; eastern Tethys
	Nie Y.; Fu X.; Xu W.; Wen H.; Wang Z.; Song C.
发表日期	2020
ISSN	14373254
起始页码	1977
结束页码	1990
卷号	109 期号:6
英文摘要	The Toarcian (Early Jurassic) sediments are regarded as the most significant hydrocarbon source rocks in the Qiangtang Basin, Qinghai–Tibet Plateau. In this study, geochemical and mineralogical data are reported from the Middle to Late Toarcian organic-lean sediments in the Qiangtang Basin, eastern Tethys. Combined with previous studies, the factors that control organic matter (OM) accumulation during the Toarcian are investigated. The Early Toarcian organic-rich sediments were deposited in stratified water column with oxygen-deficient bottom water, which was conducive to OM preservation. A warm and humid paleoclimatic condition favored the growth of organisms, which in turn could enhance the surficial biotic productivity. During the Middle to Late Toarcian, oxic waterbody was widely distributed in the Qiangtang Basin. This condition was unbeneficial to the preservation of OM. During this interval, a cold–arid climate had an adverse effect on organism growth, which in turn would reduce the initial productivity of surface water. The consistently low Ti/Al and Si/Al ratios revealed restricted but rather homogeneous clastic influx conditions during the Toarcian. This may suggest that the dilution of terrigenous material input had a little influence on OM accumulation. In addition, the differential enrichment of OM between shales and marls should attribute to carbonate dilution. These studies emphasize that redox conditions and paleoclimatic conditions were likely responsible for OM accumulation during the Toarcian. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Organic-lean sediments; Organic-rich sediments; Qiangtang Basin; Sedimentary environment; Tethyan; Toarcian
语种	英语
scopus关键词	climate change; depositional environment; geoaccumulation; organic matter; redox conditions; source rock; Toarcian; China; Qiangtang Basin; Xizang
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147644
作者单位	State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, China; Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China; School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, China; Chengdu Center, China Geological Survey, Chengdu, 610081, China; Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land and Resources, Chengdu, 610081, China
推荐引用方式 GB/T 7714	Nie Y.,Fu X.,Xu W.,et al. Redox conditions and climate control on organic matter accumulation and depletion during the Toarcian in the Qiangtang Basin; eastern Tethys[J],2020,109(6).
APA	Nie Y.,Fu X.,Xu W.,Wen H.,Wang Z.,&Song C..(2020).Redox conditions and climate control on organic matter accumulation and depletion during the Toarcian in the Qiangtang Basin; eastern Tethys.International Journal of Earth Sciences,109(6).
MLA	Nie Y.,et al."Redox conditions and climate control on organic matter accumulation and depletion during the Toarcian in the Qiangtang Basin; eastern Tethys".International Journal of Earth Sciences 109.6(2020).