Affiliation:
1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
2. Key Laboratory of Shale Gas Exploration of Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
3. Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey, Wuhan 430205, China
Abstract
The relationship between the Late Ordovician–Early Silurian sedimentary system, weathering, paleoclimate, and primary productivity in the Yangzi region is not well understood. In this study, by analyzing the sedimentation cycle and major trace elements of the Youc well 2 in the southeast Sichuan Basin, the coupling relationships of weathering indicators, terrigenous debris input indicators, paleoclimate, redox condition indicators, U-Mo covariance model, Mo/TOC relationship, and paleoproductivity indicators are investigated. The results show that single-well logs delineate four third-order sedimentary sequences (SS1, SS2, SS3, and SS4), two sedimentary subfacies, and four sedimentary microfacies in the Wufeng Formation–Longmaxi Formation. The weathering degree is stronger at the bottom where the climate shifts from warm–wet to cold–dry, and the seawater is in an oxidic–anoxic–oxidic–anoxic environment. While the primary productivity and material source input decreases gradually in the middle and upper part, the climate becomes dry and cold, and the seawater is in an anoxic–oxidic environment. Thus, a rock enrichment model for the organic matter shale of the Wufeng Formation–Longmaxi Formation in southeast Sichuan has been established. This provides more information on the control factors concerning organic matter enrichment and their interactions.
Funder
Project of China Geological Survey
Jiangsu Natural Science Foundation project
Chongqing Natural Science Foundation general Project
Graduate Innovation Program of China University of Mining and Technology
Postgraduate Research & Practice Innovation Program of Jiangsu Province
Open Fund of the Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey
Subject
Geology,Geotechnical Engineering and Engineering Geology
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