华东地质2026，Vol.47Issue(3)：452-463,12.DOI:10.16788/j.hddz.32-1865/P.2024.12.009
闽东沿海构造窗晚古生代岩浆岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb ages of the Late Paleozoic magmatic rocks in the tectonic window along the eastern coastal Fujian Province and their geologic significance
摘要
Abstract
The coastal tectonic window of eastern Fujian is located on the eastern edge of the Cathaysia Block and contains a complex metamorphic basement,which provides key clues for exploring the tectonic evolu-tion of the Pre-Mesozoic.This paper focuses on the magmatic rocks in the Wufenglou and Daixi tectonic win-dows in Zhouning,Fujian Province,and applies LA-ICP-MS zircon U-Pb dating to further explore the petrogene-sis and geological significance.The dating results show that the magmatic rocks formed in the Late Carbonifer-ous(316-335 Ma)and contain inherited zircons of 843-2 384 Ma.Thus it can be determined that the magmatic event in the tectonic window occurred in the Late Paleozoic,and the magmatic rocks perhaps sourced from partial melting of Proterozoic sedimentary rocks(variable).Combining with the previous research and the analysis of lithofacies paleogeographic changes,it is believed that the Late Paleozoic magmatic rocks along the southeast coast formed in the extensional tectonic setting after intracontinental orogenesis,and the region may has under-gone a tectonic transition from extrusion orogeny to intracontinental extension in the Late Paleozoic,which is closely related to the intracontinental orogenesis mechanism.The research results contribute to a deeper under-standing on regional geological evolution and provide new perspectives and data support for related research.关键词
构造窗/片麻状花岗岩/锆石U-Pb定年/闽东沿海/晚古生代Key words
tectonic window/gneissic granites/zircon U-Pb dating/eastern coastal Fujian Province/Late Paleozoic分类
天文与地球科学引用本文复制引用
钟森芳..闽东沿海构造窗晚古生代岩浆岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].华东地质,2026,47(3):452-463,12.基金项目
福建省地矿局科技基金"闽东地区中生代火山岩基底构造与成矿作用关系研究(编号:闽地地[2013]34号)"项目资助. （编号:闽地地[2013]34号）
