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LA-ICP-MS Zircon U-Pb Geochronology and Geological Significance of Zhashui Granitoids and Dongjiangkou Granitoids from Qinling,Central China

YANG Kai1,LIU Shuwen1, LI Qiugen1,WANG Zongqi2,HAN Yigui3,WU Fenghui1,ZHANG Fan11.The Key Laboratory of Orogenic Belt and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences, Peking University,Beijing 100871;2.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;3.The Geolosical Lab Center,China University of Geosciences,Beijing 100083  
Zhashui granitoids and Dongjiangkou granitoids in the South Qinling tectonic domain of the Qinling orogen,ShanXi province,are composed of porphyry-like granodiorites and porphyry-like monzogranites.LA-ICP-MS zircon U-Pb dating,in conjunction with CL-imagery,reveals that the Zhashui porphyry-like monzogranite(sample ZS01-01) emplaced from 209±2 Ma to 199±2 Ma,and Dongjiangkou porphyry-like monzogranite(sample ZS04-01) from 219±2 Ma to 209±2 Ma.Integrated with the previous studies in regional tectonic setting and geochemical characteristics,the two granitoids formed in one geological event.Emplacement of the Dongjiangkou instrusion is slightly earlier than Zhashui intrusion,and second emplacement of the Dongjiangkou intrusion occurred at synchronous time with the main emplacement of the Shashui intrusion.These new dating data of these two intrusions indicates existing three stages of the tectono-magma activities during ~219 Ma to ~199 Ma along Shangdan suture belt in the north margin of the South Qinling tectonic domain.
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