干旱区生态环境知识资源中心(Arid): Major and trace elements as indicators for organic matter enrichment of marine carbonate rocks: A case study of Ordovician subsalt marine formations in the central-eastern Ordos Basin, North China

Arid

DOI	10.1016/j.marpetgeo.2019.08.028
	Major and trace elements as indicators for organic matter enrichment of marine carbonate rocks: A case study of Ordovician subsalt marine formations in the central-eastern Ordos Basin, North China
	Li, Xiaofeng 1,2; Gang, Wenzhe 1,2; Yao, Jingli 3; Gao, Gang 1,2; Wang, Chengcheng 1,2; Li, Jiaye 1,2; Liu, Yan 1,2; Guo, Yu 1,2; Yang, Shangru 1,2
通讯作者	Gang, Wenzhe
来源期刊	MARINE AND PETROLEUM GEOLOGY
ISSN	0264-8172
EISSN	1873-4073
出版年	2020
卷号	111 页码:461-475
英文摘要	This research reveals the depositional environment can affect the organic matter enrichment. The major elements and trace elements are important indexes to reconstruct the depositional environment of Ordovician subsalt marine formations in the central-east Ordos Basin, combining organic parameters with inorganic parameters. Based on the microfacies, the study area is divided into gypsum-bearing dolomite flat, dolomite flat, gypsum-salt depression and limy dolomite flat. The higher Ti/Al ratios and the characteristics of trace elements show that there were detrital inputs in the sedimentation process. When the amounts of detrital inputs are large enough, they can obviously adsorb the elements and dilute the organic matter. Therefore, gypsum-bearing dolomite flat and dolomite flat have lower organic matter accumulation with higher detrital input. Lower P/Ti and Ba-excess indicate the deficiency of paleoproductivity. Sr/Ba is higher than 0.6, indicating marine-continental transitional and marine environment. Even the paleosalinity is higher, previous researches have demonstrated the descending sea levels and strong hydrodynamic conditions are unfavorable for organic matter preservation. Lower paleoclimate index C and higher Sr/Cu illustrate arid and hot conditions. The value of V/(V + Ni) suggests that the limy dolomite flat is under the oxidizing conditions, and the three other environments are reductive to a certain extent. The Mo-U covariation shows that the water body is under strongly restricted conditions. These conditions are not conducive to biological growth and the accumulation of organic matter, causing low ancient productivity. The partial correlation analysis shows: the organic matter enrichment is affected by multiple factors; paleoproductivity, paleosalinity and paleoclimate have greater influence on the results of organic matter enrichment, and detrital input and oxidation conditions can decrease the paleoproductivity, indicating multiple factors are interrelated and interact with each other.
英文关键词	Ordovician Microfacies Ordos basin Organic matter enrichment Carbonate Depositional environment Major element Trace element
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000498747300029
WOS关键词	SEDIMENTARY GEOCHEMICAL PROXIES ; DEPOSITIONAL ENVIRONMENT ; PALEOENVIRONMENT INTERPRETATION ; YANGTZE PLATFORM ; SICHUAN BASIN ; BLACK SHALE ; ARABIAN SEA ; RICH SHALE ; REDOX ; PRESERVATION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312185
作者单位	1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China; 2.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China; 3.PetroChina Changqing Oilfield Co, Explorat & Dev Res Inst, Xian 710018, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaofeng,Gang, Wenzhe,Yao, Jingli,et al. Major and trace elements as indicators for organic matter enrichment of marine carbonate rocks: A case study of Ordovician subsalt marine formations in the central-eastern Ordos Basin, North China[J],2020,111:461-475.
APA	Li, Xiaofeng.,Gang, Wenzhe.,Yao, Jingli.,Gao, Gang.,Wang, Chengcheng.,...&Yang, Shangru.(2020).Major and trace elements as indicators for organic matter enrichment of marine carbonate rocks: A case study of Ordovician subsalt marine formations in the central-eastern Ordos Basin, North China.MARINE AND PETROLEUM GEOLOGY,111,461-475.
MLA	Li, Xiaofeng,et al."Major and trace elements as indicators for organic matter enrichment of marine carbonate rocks: A case study of Ordovician subsalt marine formations in the central-eastern Ordos Basin, North China".MARINE AND PETROLEUM GEOLOGY 111(2020):461-475.