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《Acta Petrologica Sinica》 2011-09
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Geochronology,geochemistry and tectonic significance of granites in the Tinh Túc W-Sn ore deposits,Northeast Vietnam

WANG DongSheng1,LIU JunLai1**,TRAN MyDung2,NGYUEN QuangLuat2,GUO Qiang1,WU WenBin1,ZHANG ZhaoChong1 and ZHAO ZhiDan1 1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China 2.Hanoi University of Geology and Mining,Hanoi,Vietnam  
The Tnh Túc W-Sn ore deposit in Cao Bng,Northeast Vietnam,is located in the Ngn Sn-Tnh Túc metallogenic belt,which is a part of the Northeast Vietnam-Southwest China granite-related W-Sn metallognic belt.SIMS U-Pb dating results of zircons from the granite samples show that the granite was empaced at 93.9±3.0Ma.Geochemical analysis indicates that the granite is S-type granite,charactered by high SiO2(73.5%~74.6%),peraluminous(Al2O3:14.21%~14.88%),alkali(Na2O+K2O:6.64%~8.47%).The rocks are rich in potassium,but poor in sodium(K2O/Na2O1).They also have relatively high Rb,Th,U,Zr,Hf,and low Ba,Nb,Sr,Ti,Eu.They are rich in LREE,with an obvious negative Eu anomaly.The rocks have initial 87Sr/86Sr of 0.749±0.027,and their εNd(t) ranges from-10.71 to-10.42.Based on the geochemical results,isotope data and zircon U-Pb results of the Pia Oc granite,it is concluded that the granite was emplaced during a post-orogenic extensional setting and resulted from high differentiation magma.Comparing with the characteristics of the ore-bearing granites in southwestern South China,we suggest that the Pia Oc in Tnh Túc ore deposit be grouped into the Gejiu-Dachang granite belt.After comparison with the granites in the Tengchong-Moulmein granite belt and applying the geochemical discrimination of tectonic settings,we conclude that the Gejiu-Dachang granite belt are related to both Pacific tectonic domain and Tethyan tectonic domain;The latter is predominant relative to the former.
【Fund】: 国家“973”项目(2009CB421001);; 国土资源部公益性行业科研专项经费项目(200811008、201011027-1);; 地质调查局项目(1212010913036)联合资助
【CateGory Index】: P588.121
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