成都理工大学学报（自然科学版）2026，Vol.53Issue(1)：106-123,18.DOI:10.12474/cdlgzrkx.2024062601
华南南雄盆地晚白垩世—古近纪红层的物源演化对区域构造体制转换的启示
Provenance evolution of Cretaceous-Paleogene red beds in Nanxiong Basin,south China:implications for regional tectonic transitions
摘要
Abstract
The south China Block underwent intracontinental extension during the late Mesozoic driven by adjustments in the subduction angle of the paleo-Pacific plate,resulting in a series of northeast-southwest trending extensional basins,exemplified by Nanxiong Basin.These basins are characterized by terrigenous clastic strata that recorded provenance changes driven by regional tectonic activities.To investigate the geochemical characteristics and provenance of sediments from the Cretaceous to Paleogene in Nanxiong Basin,systematic sampling was conducted for the Zhenshui,Shanghu,and Nongshan Formations in the Luofuzhai and Ejingling sections of the basin.A total of 14 sandstone and mudstone samples were analyzed for major and trace elements,and three samples were examined for detrital zircon U-Pb ages and Lu-Hf isotopes.The whole-rock geochemical data reveal that the Zhenshui Formation was primarily sourced from felsic igneous rocks,and the Shanghu Formation was also dominated by felsic igneous sources,but with an increasing contribution from ancient metamorphosed sedimentary rocks.The Nongshan Formation exhibits a more diverse provenance,with a continued dominance of felsic igneous material mixed with mafic components.The detrital zircon U-Pb ages and Hf isotopic data indicate that the Zhenshui Formation primarily derives from Indosinian Qingzhangshan granite plutons to the south of Nanxiong Basin,while the Shanghu Formation was sourced from Caledonian granite plutons to the north and Precambrian ancient clastic rocks of the Cathaysia block.The Nongshan Formation,however,is mainly sourced from Caledonian and Indosinian granite bodies along the basin's periphery,with Cathaysia ancient clastic rocks representing only a minor source.The provenance change suggests a tectonic regime transition in Nanxiong Basin during the late Cretaceous to early Paleogene,from extension to compression.Subsequently,the compressional tectonic activity weakened during the deposition of the Nongshan Formation.关键词
南雄盆地/物源分析/沉积地球化学/碎屑锆石年代学/晚白垩世—古近纪Key words
Nanxiong Basin/provenance analysis/sedimentary geochemistry/detrital zircon geochronology/late Cretaceous-Paleogene分类
天文与地球科学引用本文复制引用
周昱君,李超,陈国辉,李宏卫,贾翼飞,单文琪,高明涛..华南南雄盆地晚白垩世—古近纪红层的物源演化对区域构造体制转换的启示[J].成都理工大学学报（自然科学版）,2026,53(1):106-123,18.基金项目
广东国家公园建设专项资金项目(2021GJGY026) （2021GJGY026）
中央高校基本科研业务费专项资金项目(B240201109) （B240201109）
河海大学大学生创新创业训练计划资助项目(2024102944801). （2024102944801）
