华南地质2025，Vol.41Issue(3)：473-481,9.DOI:10.3969/j.issn.2097-0013.2025.03.001
北大别木子店地区冥古宙锆石地球化学揭示地球早期活动盖层构造
Geochemistry of Muzidian Hadean Zircon in the Northern Dabie Orogenic Belt Indicates Mobile-Lid Tectonics of the Early Earth
摘要
Abstract
The composition and origin of the Earth's Hadean continental crust are pivotal for understanding the accretion and evolution of the planet.In this study,we present trace-element data for the Hadean zircons discovered at the Muzidian region in the northern Dabie orogenic belt.Using experimentally determined partition coefficients between zircon and coexisting melt,we calculated the composition of the parental melts from which these zircons crystallized.The calculated melts exhibit SiO2 contents of 53.5-61.5 wt.%,with Th/Nb,Dy/Yb,and Th/Y ratios of 1.91-5.06,0.52-1.07,and 0.12-0.34,respectively.These geochemical signatures preclude their derivation from intraplate basalts,TTG(tonalite-trondhjemite-granodiorite)gneisses,impact-induced melts,or magmatisms associated with stagnant-lid tectonics.Instead,the calculated melts closely resemble modern basaltic andesites formed in subduction-related settings,indicating that mobile-lid tectonics may have been in operation at the earliest stages of Earth's history.关键词
木子店地体/冥古宙锆石/早期地球/大陆地壳/活动盖层构造Key words
Muzidian Terrane/Hadean zircon/early Earth/continental crust/mobile-lid tectonics分类
地质学引用本文复制引用
邱啸飞,陈伟雄,童喜润,邓新,彭旎..北大别木子店地区冥古宙锆石地球化学揭示地球早期活动盖层构造[J].华南地质,2025,41(3):473-481,9.基金项目
国家自然科学基金项目"北大别始太古代基底岩系的组成、地球化学特征及其对早期地壳演化的制约"(42272229)和广东省地质勘查与城市地质专项(2024-10)"广东1∶5万横陂、安流、双华、龙村圩幅区域地质调查"项目 （42272229）
