中国地质调查2026，Vol.13Issue(2)：48-62,15.DOI:10.19388/j.zgdzdc.2025.178
华南粤东盆地晚三叠世—中侏罗世沉积岩碎屑锆石物源分析及对构造体制转换的指示
Detrital zircon provenance analysis of the Late Triassic-Middle Jurassic sedimentary rocks in Eastern Guangdong Basin of South China and its implications for tectonic regime transition
摘要
Abstract
The transition of South China Block from the Paleo-Tethyan to the Paleo-Pacific tectonic domain ex-erted a profound influence on regional tectonic evolution,sedimentary basin architecture,and magmatic activity.However,the timing of this critical tectonic regime transition remains contentious.This study focused on the Late Triassic-Middle Jurassic sedimentary rocks in Heyuan area of Eastern Guangdong Basin in South China,and conducted U-Pb chronology research on detrital zircons from the Late Triassic-Early Jurassic Yinpingshan For-mation and the Middle Jurassic Zhangping Formation.The sedimentary environment and provenance distribution characteristics were analyzed and the regional tectonic evolution were integrated for comparative analysis,provi-ding new evidence for the study of tectonic domain transformation of South China Block.The results showed that Yinpingshan Formation formed in a littoral sedimentary environment,with detrital zircon age spectrums displaying peaks at 247 Ma,422 Ma,and 2 492 Ma.The youngest zircon age was(226.3±1.99)Ma,showing its deposi-tional age to no earlier than the Norian stage of the Late Triassic.Provenance analysis indicated dominant sedi-ment derivation from the southwest,including Jinshajiang-Ailaoshan suture zone,Songma belt,and Hainan Is-land,exhibiting the structural characteristics of NW-trending folds superimposed by NE-trending folds.In con-trast,Zhangping Formation representsed a lacustrine depositional environment,characterized by multi modal de-trital zircon age peaks at 173 Ma,273 Ma,442 Ma,781 Ma,1 858 Ma,and 2 472 Ma.The youngest zircon age was(173.1±1.56)Ma,suggesting deposition no earlier than the Aalenian stage of the Middle Jurassic.Prove-nance shifted to a multi-directional supply system,including the eastern Nanling Range,Wuyi Uplift Zone,Jiangnan Orogen,the southeastern coastal magmatic belt,and Hainan Island,showing a NE-trending fold pat-tern.It demonstrated that Eastern Guangdong Basin was in a transitional stage from the Paleo-Tethyan to Paleo-Pacific tectonic domains during the early Middle Jurassic,combined with the evidence from provenance shifts,fa-cies changes,and differential tectonic features demonstrates.关键词
粤东盆地/中生代/碎屑锆石/U-Pb测年/沉积物源分析/构造体制转换Key words
Eastern Guangdong Basin/Mesozoic/detrital zircon/U-Pb age/sedimentary provenance analysis/tectonic regime transition分类
天文与地球科学引用本文复制引用
白清霖,郑思琦,林振文,陆野,阳峰,罗俊超,余红霞..华南粤东盆地晚三叠世—中侏罗世沉积岩碎屑锆石物源分析及对构造体制转换的指示[J].中国地质调查,2026,13(2):48-62,15.基金项目
广东省地质勘查与城市地质专项基金"广东1∶5万蓝塘、观音阁幅区域地质调查(编号:2023-19、2024-01)""广东1∶25万惠州市幅区域地质调查(编号:2026-01)"及"广东1∶5万双江圩、义合圩、河源县、柏埔圩幅区域地质调查(编号:2025-01)"联合资助. （编号:2023-19、2024-01）
