Provenance and Tectonic Implications of Paleozoic Strata in the South Yellow Sea Basin, China-Revealed from the Borehole CSDP-2  

作　　者：GAO Xiaohui ZHANG Xunhua GUO Xingwei CAI Laixing HOU Fanghui ZHU Xiaoqing 

机构地区：[1]College of Marine Geosciences,Ocean University of China,Qingdao 266100,China [2]Institute for Advanced Ocean Study,Ocean University of China,Qingdao 266100,China [3]Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China [4]Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China

出　　处：《Journal of Ocean University of China》2020年第3期536-550,共15页中国海洋大学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.41776081, 41210005);the China Geological Survey Project (No.DD20160147);Aoshan Science and Technology Innovation Project of Qingdao Pilot National Laboratory for Marine Science and Technology (No.2015ASKJ03)。

摘　　要：Well CSDP-2 is a fully coring deep drilling hole, penetrating the thick Paleozoic marine strata in the South Yellow Sea Basin(SYSB) in the lower Yangtze Block(LYB). Based on the petrological and geochemical analysis of 40 sandstone samples from the core CSDP-2, the provenance and tectonic features of Paleozoic detrital rocks from SYSB are analyzed and systematically delineated in this article. The results show that the Silurian – Carboniferous sandstones are mature sublitharenite, while the Permian sandstones are unstable feldspathic litharenite. The average CIA(chemical index of alteration) is 74.61, which reflects these sediments were derived from source rocks with moderate chemical weathering. The REE(rare earth element) patterns are characterized by LREE enrichment, flat HREE and obviously negative Eu anomaly, which are similar to that of the upper continental crust. Dickinson QFL discrimination results indicate the recycled orogeny provenance. Various diagrams for the discrimination of sedimentary provenance based on major and trace element data show all the sediments were derived predominantly from quartz sedimentary rocks, of which the Permian strata contain more felsic sedimentary rocks. Geochemical data for these detrital rocks suggest they occur at the passive continental margin and island arc settings, and the Permian sandstone presents active continental margin setting.

关 键 词：South Yellow Sea Basin PALEOZOIC geochemistry provenance analysis tectonic setting 

分 类 号：P736[天文地球—海洋地质]