Re-Os Dating of the Suoerkuduke Cu (Mo) Deposit,Fuyun County,Xinjiang,and Its Geodynamic Implications  

作　　者：刘秀金 刘伟 

机构地区：[1]State Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Journal of Earth Science》2013年第2期188-202,共15页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 41273019,40972053);the Chinese State 973 Program (No. 2007CB411302);the Fund of Chinese Academy of Sciences (No. KZCX2-YW-JS109)

摘　　要：The Suoerkuduke Cu （Mo） deposit, in the same metallogenic belt with Xilekuduke Cu-Mo deposit, is located in the Armantai island arc belt on the northern margin of East Junggar, Northwest China. Rhenium and osmium isotopic analysis of seven molybdenite samples from the deposit was used to determine the age of mineralization. A seven-point isochron age of 317.7±7.6 Ma, which is consistent, within analytical error, with the average model age of 323.3±1.9 Ma indicates that this deposit was formed at transitional period between the Early and Late Carboniferous. This age is obviously later than that of the Lower Devonian Tuoranggekuduke Formation acting as the wall rock but contemporaneous with the early stage of plutonism （330-268 Ma） in East Junggar. Based on the characteristics of mineralization age and tectonic setting of many typical deposits on the northern margin of East Junggar, we proposed that the mineralization age of Suoerkuduke deposit is a key period of East Junggar for the tectonic regime transforming from compression to extension and also the time when granitoids and deposits widely spread in this area. Mineralization and formation of skarn in this deposit are closely related to felsic-intermediate magmatism. The distinct characteristic from typical skarn-type deposits is that the metallogenic parent intrusion is a huge batholith in the depth. The Cu （Mo） mineralization, moyitc, and granite porphyry are all derived products of the batholith.The Suoerkuduke Cu （Mo） deposit, in the same metallogenic belt with Xilekuduke Cu-Mo deposit, is located in the Armantai island arc belt on the northern margin of East Junggar, Northwest China. Rhenium and osmium isotopic analysis of seven molybdenite samples from the deposit was used to determine the age of mineralization. A seven-point isochron age of 317.7±7.6 Ma, which is consistent, within analytical error, with the average model age of 323.3±1.9 Ma indicates that this deposit was formed at transitional period between the Early and Late Carboniferous. This age is obviously later than that of the Lower Devonian Tuoranggekuduke Formation acting as the wall rock but contemporaneous with the early stage of plutonism （330-268 Ma） in East Junggar. Based on the characteristics of mineralization age and tectonic setting of many typical deposits on the northern margin of East Junggar, we proposed that the mineralization age of Suoerkuduke deposit is a key period of East Junggar for the tectonic regime transforming from compression to extension and also the time when granitoids and deposits widely spread in this area. Mineralization and formation of skarn in this deposit are closely related to felsic-intermediate magmatism. The distinct characteristic from typical skarn-type deposits is that the metallogenic parent intrusion is a huge batholith in the depth. The Cu （Mo） mineralization, moyitc, and granite porphyry are all derived products of the batholith.

关 键 词：Re-Os isotopic age Early to Late Carboniferous tectonic regime transformation Suoerkuduke Cu （Mo） deposit East Junggar. 

分 类 号：P597.3[天文地球—地球化学]