Dating Kimberlite Using Apatite U-Pb Geochronology: A Case Study from Diamond-Bearing Dikes in South China  

作　　者：Jiawei Zhang Huan Wang Defeng He Yuhua Zhu Kun Wang Yuan Qiu 

机构地区：[1]Guizhou Geological Survey,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Guiyang 550081,China [2]College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China [3]Yanduzhongshi Geological Analysis Laboratory Ltd.,Beijing 100080,China [4]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

出　　处：《Journal of Earth Science》2024年第3期1059-1062,共4页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41963006 and 41603039)。

摘　　要：Kimberlite,one of the deepest known magmatic rocks on Earth,offers valuable glimpses into the deep mantle composition(Woodhead et al.,2019),craton structure(Gardiner et al.,2020),global geodynamic variation(Tappe et al.,2018),and diamond formation(Giuliani et al.,2023).The accurate determination of the emplacement of this special rock is crucial for revealing such information.However,dating kimberlite is challenging due to its silica-poor,volatile-rich,strongly altered,and hybrid nature(Mitchell et al.,2019).Zircon is unsuitable for dating kimberlite and related rocks due to its preference for crystallizing in intermediate to felsic melts(Gervasoni et al.,2016)rather than silica-poor ones.Even if present,zircon is prone to Pb loss through hydrothermal alteration(Zi et al.,2022)in a volatile-rich system like kimberlitic magmas.

关 键 词：DATING MAGMA ALTERATION 

分 类 号：P58[天文地球—岩石学]