Middle Eocene terrestrial paleoweathering and climate evolution in the midlatitude Bohai Bay Basin of eastern China

作     者：Di Chen Fu-jie Jiang Xiong-Qi Pang Ling-Jian Meng Zheng-Jun Wang Zhi Xu Xue Zhang Li-Na Huo Jia-Hao Wen Ren-jie zhao Yuan Li 

作者机构：State Key Laboratory of Petroleum Resources and ProspectingBeijing102249China College of GeosciencesChina University of Petroleum(Bejing)Beijing102249China Petro China Jidong Oilfeld CompanyTangshanHebei063004China Chinese Academy of Natural Resources EconomicsBejing100035China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第3期

页      面：1471-1487页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0710[理学-生物学] 08[工学] 0703[理学-化学] 082002[工学-油气田开发工程] 

基　　金：funded by Science Foundation of China University of Petroleum,Beijing(No.2462022XKBH005) China Postdoctoral Science Foundation(2022M723487) the National Science and Technology Major Project of the Ministry of Science and Technology of China(2016ZX05006-006) PetroChina Project(2021DJ0704) 

主　　题：Middle Eocene Paleoclimate Weathering MES shales Bohai Bay Basin 

摘      要：The middle Eocene climatic optimum(MECO,ca.-42 Ma)is a key time period for understanding Cenozoic cooling of the global ***,midlatitude terrestrial records of climate evolution during MEcO epoch are *** this study,continuous high-resolution record of shale sediments in mid-Eocene Shahejie Formation(MES shales)in the Bohai Bay Basin were performed with major-element and wavelet *** midlatitude paleoweathering and paleoclimatic evolution during MEcO epoch were analyzed in this *** MES shales experienced weak-moderate paleoweathering under a subtropical monsoon paleoclimate with mean annual temperature of 8.3-12.9℃ and mean annual precipitation of 685-1100 mm/*** MES shales record a mixed provenance involving intermediate igneous rocks,and low compositional *** nutrient-rich environment led to enrichment in organic matter in the MES *** analysis revealed good periodicity about the paleoclimate and weathering during MECO *** the stage I of MES shales depositional process,the paleolake was high in nutrients,and the MES shales experienced high chemical weathering due to a relatively warmer and more humid *** contrast,the climate in stage II was relatively cold and dry,and the maturity of the MES shales was relatively high during this stage,suggesting a relatively stable tectonic *** work provides more terrestrial records of MEco epoch for midlatitude region,and is benefit for better understanding of the palaeoenvironment when MES shales *** implication of organic matters enrichment in this study is meaningful for the shale oil/gas exploration in Nanpu Sag.