地质学报2020，Vol.94Issue(10)：3024-3035,12.
中国北部陆架海碎屑锆石U-Pb年龄和钾长石主微量元素物源示踪研究
Detrital zircon U-Pb ages and K-feldspar main and trace elements provenance studying from fluvial to marine sediments in northern China
摘要
Abstract
A large amount of fluvial detrital sediments accumulate in the Bohai Bay Basin each year，however，it is not clear whether the sand-grade grains can migrate and spread to the gulfs of Jiaodong Peninsula，North China. Here we present 438 new concordant detrital zircon U-Pb ages from the Liao，Luan，Yongding， Hutuo，and Zhang rivers，as well as the marine sands from the Liugong Island，Weihai and Yintan bays of Jiaodong Peninsula. We also present a compilation of published bedrock and detrital zircon data from Jiaodong and Korean peninsulas to evaluate potential sediment source regions. The peak ages of zircons in marine sands are characterized by the presence of Neoproterozoic and the absence of Paleoproterozoic and Neoarchean peak ages. Combined with the Th/U rations and MDS plot，we find that the detrital zircons from rivers in the North China Craton and Korean Peninsula are not the main provenance areas for sand-grade grains within the bays of Jiaodong Peninsula. These detrital sand-grade sediments are mainly from local source areas from the Jiaodong Peninsula. We also present 160 new in situ geochemical data on detrital K-feldspar grains from the Yellow River and Weihai and Yintan from the Jiaodong Peninsula to check the above results. By comparing the content change of main elements(NaO，K2O，Al2O3) and trace elements (Rb，Sr，Pb，Ba)，it can be clearly found that there are no provenance relationships among them. Therefore，the combination of detrital zircon and K-feldspar in situ geochemical analysis can become a potential provenance tool for studying material spreading in the marginal sea of North China，big river evolution and basin-mountain coupling of Bohai Bay Basin.关键词
渤海/胶东半岛/锆石/U-Pb年龄/钾长石/元素特征/物源示踪Key words
Bohai Sea/Jiaodong Peninsula/Zircon/U-Pb ages/K-feldspar/Element characteristics/ Provenance引用本文复制引用
林旭,刘静,吴中海,王世梅,赵希涛,陈勇,李兆宁,刘海金..中国北部陆架海碎屑锆石U-Pb年龄和钾长石主微量元素物源示踪研究[J].地质学报,2020,94(10):3024-3035,12.基金项目
本文为国家自然科学基金项目(编号41702178,41972212)资助的成果. （编号41702178,41972212）
