Biomarkers reveal the terrigenous organic matter enrichment in the late Oligocene-early Miocene marine shales in the Ying-Qiong Basin,South China Sea

作     者：Wenjing Ding Youchuan Li Lan Lei Li Li Shuchun Yang Yongcai Yang Dujie Hou Wenjing Ding;Youchuan Li;Lan Lei;Li Li;Shuchun Yang;Yongcai Yang;Dujie Hou

作者机构：China National Offshors Oil Corporation(CNOOC)Research Institute Co.Ltd.Beijing 100028China School of Natural SciencesMacquarie UniversitySydney 2109Australia School of Energy ResourcesChina University of GeosciencesBeijing 100083China CNOOC International LimitedBeijing 100028China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2023年第42卷第3期

页      面：31-53页

核心收录：

学科分类：070704[理学-海洋地质] 081803[工学-地质工程] 07[理学] 08[工学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 

基　　金：The National Natural Science Foundation of China under contract No.42202184 the National Science and Technology Major Project under contract No.2016ZX05026。 

主　　题：total organic carbon higher plant-derived biomarkers tropical/subtropical plants East Asian monsoonal climate 

摘      要：The increase of total organic carbon content of the late Oligocene-early Miocene terrigenously-dominated marine shales in the shallower depth intervals was reported in the Ying-Qiong Basin,South China Sea.The organic enriched lower Sanya Formation shales(early Miocene)have biomarker characteristics of tropical/subtropical plants,with abundant high molecular weight n-alkanes,angiosperm-derived oleanane,rearranged oleananesⅠ,Ⅱ,Ⅱ,tricyclic/tetracyclic terpanes including des-A-oleanane,X,*,Y,Z,Z1 and bicadinanes W,T,T1,R.The biomarker characteristics are suggestive of larger influx of the dominant tropical/subtropical angiosperms in flora under a warming and more humid climate during depositions of the lower Sanya Formation(early Miocene)than the older Lingshui Formation(late Oligocene).The tropical/subtropical angiosperm input was thought as the prime control of terrigenous organic matter enrichment relative to the redox condition,and the coeval sea level changes and seafloor spreading in the South China Sea.Enrichment of the terrigenous organic matter in the early Miocene shales is likely in association with the coeval peak East Asian summer monsoon intensity in the South China Sea.