文献类型：期刊文献

英文题名：Mechanisms of organic matter accumulation during Early Silurian carbon-cycle perturbations: Geochemical constraints from the inner shelf, Upper Yangtze, South China

作者：Chen, Weizhen[1];Tian, Jingchun[1];Lin, Xiaobing[1];Feng, Kailong[2,3];Liang, Qingshao[1];Yu, Wei[4];Wang, Xing[5];Sun, Shi[1]

机构：[1]Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China;[2]Tongji Univ, Ctr Marine Resources, Shanghai 200092, Peoples R China;[3]Guangdong Ocean Univ, Naval Architecture & Shipping Coll, Zhanjiang 524088, Peoples R China;[4]Shandong Inst Petr & Chem Technol, Coll Petr Engn, Dongying 257061, Peoples R China;[5]Mineral Resources Survey Inst Hunan Prov, Changsha 410000, Hunan, Peoples R China

年份：2026

卷号：681

外文期刊名：PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY

收录：SCI-EXPANDED(收录号：WOS:001620526000002)、、WOS

基金：We sincerely appreciate Prof. Shuzhong Shen (editor) for the prompt handling of our manuscript and extend our gratitude to two anonymous reviewers for their valuable and professional insights. We thank Drs. Ji Teng, Xiaojiang Peng, and Dingxin Yi for their valuable and constructive suggestions during this research. This study was supported by the Na-tional Natural Science Foundation of China (Grant No. 42372141, U24A20591, and 42272132) .

语种：英文

外文关键词：Early Silurian; South China; Glaciation; Carbon isotope; Organic matter accumulation

外文摘要：There was a strong relationship between paleo-oceanic conditions and organic matter accumulation following the Hirnantian glaciation event. The Yangtze Platform in South China offers a unique perspective for studying this relationship, but our understanding of climate change and paleoenvironmental evolution remains limited, which hinders a deeper understanding of the mechanisms of organic matter accumulation and its relationship with carbon cycle disturbances. To fill this knowledge gap, we used newly obtained datasets from the Lower Silurian Longmaxi Formation (Rhuddanian-early Aeronian) in the inner continental shelf. The results show that the Longmaxi Formation shales in the study area can be divided into three intervals based on their geochemical evolutionary trend. Unit 1 (Early Rhuddanian): Organic matter enrichment is closely related to marine primary productivity, favorable preservation conditions, and low sedimentation rates. Environmental changes triggered the reactivation of oceanic circulation and upwelling, enhancing marine primary productivity and subsequently driving organic matter accumulation during Unit 2 (Middle-Late Rhuddanian). In contrast, Unit 3 (Early Aeronian) has less organic matter accumulation, which is related to the enhancement of oxygen-bearing bottomwater conditions and the increase in terrigenous debris input. Furthermore, the combined effects of volcanic activity, organic carbon burial, and carbonate weathering may have regulated carbon isotope excursions during different stages to varying degrees. Our research provides new insights into the influence of paleoclimate and marine-environmental conditions following glacial events on organic-matter accumulation and carbon-cycle perturbations.