CHEN Xuanhua,WANG Xiaofeng,George GEHRELS,YANG Yi,QIN Hong,CHEN Zhengle,YANG Feng,CHEN Bailin and LI Xuezhi Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China,Department of Geosciences,University of Arizona,USA,Xinjiang Geological Survey,Urumqi,Xinjiang 830011,China,Geological Lab. Center,China University of Geosciences,Beijing 100083,China
P618.51
This paper discusses the relationships between granitic magmatism and gold mineralization and the exhumation history of the Dapinggou gold deposit in northern Altun, NW China based on the geochronological data, including zircon U-Pb ages, Rb-Sr isochron age and 40Ar-39Ar dating and MDD modeling data. The main granitic magmatism age in this area is attained from the ID TIMS U-Pb geochronology of zircons from the Kuoshibulak granite, the biggest granite in the northern Altun area, which gives a concordant age of 443±5 Ma in the Late Ordovician. Zircon ID TIMS U-Pb geochronology of the West Dapinggou biotite granite west of the Dapinggou gold deposit gives concordant ages around 485±10 Ma, representing the early stage of Ordovician magmatism. The Rb-Sr isochron age (487±21 Ma) of 6 quartz inclusion samples from quartz veins in this gold deposit is very close to that of the West Dapinggou granite. MDD modeling of step heating 40Ar-39Ar data of K-feldspar from the same West Dapinggou biotite granite gives
CHEN Xuanhua, WANG Xiaofeng, George GEHRELS, YANG Yi, QIN Hong, CHEN Zhengle, YANG Feng, CHEN Bailin, LI Xuezhi Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, China, Department of Geosciences, University of Arizona, USA, Xinjiang Geological Survey, Urumqi, Xinjiang, China, Geological Lab. Center, China University of Geosciences, Beijing, China.2004. Early Paleozoic Magmatism and Gold Mineralization in the Northern Altun, NW China[J]. Acta Geologica Sinica(),78(2):
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