华东地质2026，Vol.47Issue(1)：98-113,16.DOI:10.16788/j.hddz.32-1865/P.2025.12.001
扬子西南缘中元古代构造演化和古地理重建:来自通安组五段碎屑沉积岩的指示
Reconstruction of Mesoproterozoic tectonic evolution and paleogeography in the southwestern Yangtze Block:evidence from the clastic sedimentary rocks of the Fifth Member of the Tongan Formation
摘要
Abstract
This study focuses on the detrital rocks of the Fifth Member of Mid-Mesoproterozoic Tongan Formation(TA-5)in the southwestern marginal Yangtze Block.Through whole-rock major and trace element analysis with existing zircon U-Pb age data combined,we conducted a comprehensive study to clarify the prove-nance characteristics,define the sedimentary tectonic setting,and furthermore reconstruct the paleogeographic po-sition of the Yangtze Block during this period.Results reveal that the TA-5 sediments were primarily sourced from intermediate to felsic igneous rocks and deposited in an active continental margin setting,recording a region-al tectonic transition from convergence to collision.Comparison of zircon ages reveals that the southwestern marginal Yangtze Block during the Mid-Mesoproterozoic has a significant affinity with the western Laurentia,southern Australia and East Antarctica,while its northern margin is closely related to the western Laurentia and southern Siberia.These findings support the adjacency of the Yangtze Block to the aforementioned blocks in the Columbia supercontinent,providing new evidence for reconstructing the paleogeographic position of the Yangtze Block in the supercontinent.关键词
中元古代中期/扬子陆块/通安组5段/Columbia超大陆Key words
Mid-Mesoproterozoic/Yangtze Block/Fifth Member of Tongan Formation/Columbia super-continent分类
天文与地球科学引用本文复制引用
孙力,王伟..扬子西南缘中元古代构造演化和古地理重建:来自通安组五段碎屑沉积岩的指示[J].华东地质,2026,47(1):98-113,16.基金项目
国家自然科学基金"扬子陆块西南缘中—新元古代昆阳群物源分析及其对Rodinia超大陆重建的指示(编号:42502184)""扬子陆块西南缘古—中元古代地层物源分析及其对Columbia超大陆重建的指示意义(编号:42272228)"、湖北省自然科学基金"流域关键地质过程与磷成矿机制(编号:2025AFA033)"、陕西省自然科学基础研究计划"扬子陆块西北缘中—新元古代火地垭群物源、构造演化分析及其对超大陆重建的指示(编号:2025JC-YBQN-328)"、陕西省教育厅一般专项科学研究计划"扬子陆块米仓山地区中—新元古代火地垭群锆石U-Pb-Hf同位素及其地质意义(编号:24JK0367)"和陕西理工大学人才启动"扬子西南缘古—中元古代盆地物源分析及其地质意义(编号:SLGRC202426)"项目联合资助. （编号:42502184）
