黔南晚古生代早期碎屑锆石记录及物源转换响应

唐佐其; 刘凌云; 韩雪; 唐婷婷; 覃永军; 张嘉伟

唐佐其,刘凌云,韩雪,唐婷婷,覃永军,张嘉伟.黔南晚古生代早期碎屑锆石记录及物源转换响应[J].贵州地质,2024,(1):1-8

黔南晚古生代早期碎屑锆石记录及物源转换响应

Record and Provenance Conversion Response of Detrital Zircon in Early Paleozoic of South Guizhou

投稿时间：2023-09-07

DOI：

中文关键词: 碎屑锆石地质意义晚古生代黔南

英文关键词:Detrital zircon Geological significance Late Paleozoic South Guizhou

基金项目:贵州省地矿局科研项目(黔地矿科合〔2017〕29号、黔地矿科合〔2021〕13号)；贵州省科技厅科技支撑计划(黔科合支撑〔2020〕4Y034号)联合资助。

作者	单位
唐佐其	贵州省地质调查院，贵州贵阳550081
刘凌云	贵州省地质调查院，贵州贵阳550081
韩雪	贵州省地质调查院，贵州贵阳550081
唐婷婷	贵州省地质调查院，贵州贵阳550081
覃永军	贵州省地质调查院，贵州贵阳550081
张嘉伟	贵州省地质调查院，贵州贵阳550081

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中文摘要:

贵州黔南独山地区处扬子陆块东南缘，出露较完整的下古生界地层，对该区开展碎屑锆石U-Pb年龄谱研究可为晚古生代之前扬子地块与华夏地块结合带构造属性的进一步确定和对华南大地构造演化的深入研究提供新依据。本文对该区下泥盆统丹林组5件石英砂岩分析了375颗碎屑锆石:锆石阴极发光具有典型的振荡环带、不规则分带，Th/U比值多大于01，强Ce正异常、弱Eu负异常特征；346组谐和年龄显示来自多个源区，5组主要年龄峰值2 456 Ma、1 366 Ma、970 Ma、536 Ma、402 Ma，以970 Ma为最突出峰值。研究认为古生代锆石源于桂北-湘西内陆加里东期花岗岩、新元古代锆石主要来自江南造山带内新元古代四堡群、丹州群的火成岩；中元古代-太古宙锆石可能从华夏板块内部搬运到扬子板块。进一步论证了古生代华夏板块和扬子板块之间不存在沉积阻隔区，是一个整体板块；丹林组沉积于华南地块内的一个克拉通盆地。

英文摘要:

The Dushan area in southern Guizhou Province is located on the southeastern margin of the Yangtze landmass，where relatively complete Lower Paleozoic strata are foundThe study of detritastic zircon U-Pb age spectrum in this area can provide a new basis for further identification of the tectonic attributes of the pre-Late Paleozoic junction zone between the Yangtze Block and the Chinese Block and further study of the tectonic evolution of South ChinaIn this paper，375 detrite zircons from 5 quartz sandstones of the Lower Devonian Danlin Formation in this area are analyzedThe cathodic luminescence of zircons is characterized by typical oscillating bands，irregular zonings，Th/U ratio greater than 01，strong positive Ce anomaly and weak negative Eu anomalyThe 346 groups of harmonic ages were from multiple source regions，and the main age peaks of the 5 groups were 2 456 Ma，1 366 Ma，970 Ma，536 Ma and 402 Ma，with 970 Ma being the most prominent peakIt is believed that Paleozoic zircons originate from Caledonian granites in northern Guian-western Hunan，and Neoproterozoic zircons mainly originate from Neoproterozoic igneous rocks in Sibao Group and Danzhou Group in Jiangnan Orogenic beltMesoproterozoic Archean zircon may have been transported from the inner Cathaysia Plate to the Yangtze PlateIt is further proved that there is no sedimentary barrier between the Cathaysia plate and the Yangtze plate in the Paleozoic era，and it is a whole plateThe Danlin Formation was deposited in a craton basin in the South China block

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