北京大学学报（自然科学版）2017，Vol.53Issue(4)：667-682,16.DOI:10.13209/j.0479-8023.2017.009
广西大宁岩体和初洞岩体锆石U-Pb年代学 及Hf同位素研究
Zircon Geochronology and Hf Isotopes of Daning and Chudong Intrusions, Guangxi Prvince
摘要
Abstract
LA-ICP-MS zircon U-Pb dating for Daning pluton, dark inclusions and Chudong pluton yield the weighted mean206Pb/238Pb ages of 441.1±3.0 Ma, 439.5±3.6 Ma and 423.5-434.2 Ma, respectively, revealing that Daning pluton and the dark inclusions were formed almost concurrently, while the Daning pluton was intruded by the Chudong pluton. In-situ zircon Lu-Hf isotopic analyses of Daning pluton, dark inclusions and Chudong pluton show same characteristics with negativeεHf(t) values, plotted within the revolution areas of the 1440-1960 Ma old continental crust in the age vs.εHf(t) diagrams. The Hf isotopic characteristics indicate that the magmas could be derived from the partial melting of Early Proterozoic to Mesoproterozoic crust materials. The dark inclusions were produced by the fractional crystallization of parental magma. The Chudong pluton was the advanced stage product of the magma crystallization differentiation.关键词
锆石U-Pb年代学/Hf同位素/大宁岩体/初洞岩体Key words
zircon U-Pb dating/Hf isotopes/Daning pluton/Chudong pluton分类
天文与地球科学引用本文复制引用
郭丽爽,吕鑫,王政华,毛佐国,张继林,刘玉琳,陈旭..广西大宁岩体和初洞岩体锆石U-Pb年代学 及Hf同位素研究[J].北京大学学报（自然科学版）,2017,53(4):667-682,16.基金项目
中国黄金集团勘查项目(KY2010-01)资助 （KY2010-01）
