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Emplaced and Metallogenetic Times of Tongchang Diorities,Southern Shaanxi Province and Its Geological Implications

WANG Wei1,LIU Shuwen1,WU Fenghui1,LI Qiugen1,WANG Zongqi2,YANG Kai3,YAN Quanren2,WANG Ruiting4,YANG Pengtao1 1.The Key Laboratory of Orogenic Belt and Crustal Evolution(MOE),School of Earth and Space Sciences,Peking University,Beijing 100871;2.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037;3.China Coal Geological Engineering Corporation,Beijing 100073;4.Geological Exploration Institution of Northwest Mining and Geological Exploration Bureau for Nonferrous Metals,Xi'an 710054  
Tongchang dioritic pluton in Southern Shaanxi Province is located in the tectonic domain of the Mianxian-Lueyang-Yangpingguan triangle block,northern margin of Yangzi Craton,and consists mainly of diorite,quartzdiorite and granodiorite.Zircon grains separated from these rocks are dated using LA-ICPMS and SHRIMP U-Pb isotopic methods.The dating results indicate three intrusive stages of the Tongchang dioritic pluton,and early diorite emplaced at 879±7 Ma;middle quartz diorite at 848±5 Ma to 840±7 Ma,with copper ore-bearing albitite emplced at 834±7 Ma,which is consistent with the crystallization age of quartz diorite within error range,and the last granodiorite at 824±5 Ma.These zircon U-Pb isotopic dating results reveal that the emplacements of the Tongchang diorites and related copper deposit did not occur in Paleozoic but in Jinning stage of Neoproterozoic era.The magmatic activity and related copper deposit mineralization are important responses to the breakup event of global Rodinia supercontinent(860-750 Ma).
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