地质学报2025，Vol.99Issue(7)：2240-2250,11.DOI:10.19762/j.cnki.dizhixuebao.2023084
贵州埃迪卡拉系—寒武系凝灰岩中锆石U-Pb年龄及其地质意义
Zircon U-Pb ages and its geological significance of Ediacara-Cambrian tuff from Guizhou,South China
摘要
Abstract
The Dengying and Laobao formations are important Ediacaran-Cambrian stratigraphic units in South China.This study presents integrated zircon cathodoluminescence(CL)and U-Pb isotopic data from tuffaceous layers intercalated within these formations.Samples were collected from diverse depositional settings across Guizhou Province,encompassing platform facies(Xinzhai section,Yankong area;Jianfengding and Wangjianshan sections,Songlin area),the transition zone(Niujiaochong and Xinchong sections,Pianyan area),and slope facies(Guabang section,Sanshui area).Zircon LA-ICP-MS U-Pb dating of the tuffaceous layers yielded crystallization ages of 532±4 Ma,536±5 Ma,and 535±4 Ma for the Xinzhai,Wangjianshan,and Xinchong sections,respectively.The Jianfengding,Niujiaochong,and Guabang sections yielded ages of 520±4 Ma,517±3 Ma,and 521±3 Ma,respectively.Synthesizing these new data with previously published results,the depositional ages of the Dengying and Laobao formations are constrained from 551.1±0.7 Ma to 518±5 Ma and 550.6±3.3 Ma to 517±3 Ma,respectively.This extended temporal range suggests a period of contemporaneous,yet spatially heterogeneous sedimentation.Furthermore,uranium-rich phosphorite deposits associated with these formations exhibit distinct age ranges:546.3±2.7 Ma to 532±4 Ma in the Yankong area,536±5 Ma to 520±4 Ma in the Songlin area,and 535±4 Ma to 517±3 Ma in the Pianyan area.关键词
凝灰岩/磷块岩/灯影组/老堡组Key words
tuff/phosphorite/Dengying Formation/Laobao Formation引用本文复制引用
徐进鸿,黄启琳,吴承泉,张正伟,徐海,王琼,李艳桃,彭松,李溪遥,靳子茹..贵州埃迪卡拉系—寒武系凝灰岩中锆石U-Pb年龄及其地质意义[J].地质学报,2025,99(7):2240-2250,11.基金项目
本文为贵州省教育厅高等学校科学研究项目青年项目(编号黔教技[2022]349号,黔教技[2022]350号)、贵州省科技厅基础研究项目(编号黔科合基础-ZK[2024]一般684,黔科合基础-ZK[2023]一般463)、中国科学院战略性先导科技专项(编号XDA0430201)、铜仁市科技局博士人才项目(编号铜市科研(2024)3号)、喀斯特地质资源与环境教育部重点实验室(贵州大学,KST202305)、贵州省地质勘查基金项目(编号MCHC-ZG20212206-2)和国家自然科学基金项目(编号U1812402,U1603245,42362014)联合资助的成果. （编号黔教技[2022]349号,黔教技[2022]350号）
