Ages of the Laocheng Granitoids and Crustal Growth in the South Qinling Tectonic Domain,Central China:Zircon U-Pb and Lu-Hf Isotopic Constraints

作     者：YANG Pengtao LIU Shuwen LI Qiugen ZHANG Fan WANG Zongqi WANG Dongsheng WANG Ruiting YAN Quanren YAN Zhen 

作者机构：The Key Laboratory of Orogenic Belts and Crustal EvolutionPeking UniversityBeijing 100871 Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037 Northwest Geological Exploration and Mining Bureau for Nonferrous MetalsXi＇anShaanxi 710054 Institute of GeologyChinese Academy of Geological SciencesBeijing 100037 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2011年第85卷第4期

页      面：854-869页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：financially supported by the National Project of Scientific and Technological Support(Grant No:2006BAB01A11) 

主　　题：Laocheng granitoid pluton LA-MC-ICP-MS zircon U-Pb dating zircon Hf isotopes petrogenesis south Qinling tectonic domain 

摘      要：The Laocheng granitoid pluton is located in the South Qinling tectonic domain of the Qinling orogenic belt,southern Shaanxi Province,and consists chiefly of quartz diorite,granodiorite and monzogranite.A LA-ICP-MS zircon U-Pb isotopic dating,in conjunction with cathodoluminescence images,reveals that the quartz diorite and granodiorite were emplaced from 220 Ma to 216 Ma,while the monzogranite was emplaced at～210 ***-situ zircon Hf isotopic analyses show that theε_（Hf）（t） values of the quartz diorite and granodiorite range from-8.1 to ＋1.3,and single-stage Hf model ages from 809 Ma to 1171 Ma,while theε_（Hf）（t）values of the monzogranite are-14.5 to ＋16.7 and single-stage Hf model ages from 189 Ma to 1424 *** Hf isotopic features reveal that the quartz diorite, granodiorite and monzogranite were formed from the mixing of the magmas derived from partial melting of the depleted mantle and the lower continent crustal materials,and there were two stages of continental crust growth during the Neoproterozoic（～800 Ma）and Indosinian（～210 Ma）eras, respectively,in the south Qinling tectonic domain of the Qinling orogrnic belt,Central China.