新疆额尔齐斯构造带哲兰德金矿白云母^(40)Ar/^(39)Ar同位素年龄及地质意义  

^(40)Ar/^(39)Ar Dating of Muscovite from the Zhelande Au Deposit,Irtysh Tectonic Zone,Xinjiang and Its Geological Implications

作　　者：刘国仁[1] 李彦 王蕊[3] 王海培 杨成栋[3] 陈琦 祁世军 LIU Guo-ren;LI Yan;WANG Rui;WANG Hai-pei;YANG Cheng-dong;CHEN Qi;QI Shi-jun(Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;No.7 Geological Party of the Hebei Bureau of Geology,Yanjiao 065201,China;Key Laboratory of Metallogeny and Mineral Assessment,Ministry of National Resources;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Xinjiang Urgur Autonomous Region Institute of Geology for Mineral Resources,Urumqi 830001,China)

机构地区：[1]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [2]河北省地矿局第七地质大队,河北燕郊065201 [3]自然资源部成矿作用与资源评价重点实验室中国地质科学院矿产资源研究所,北京100037 [4]新疆维吾尔自治区地质矿产研究所,新疆乌鲁木齐830001

出　　处：《岩矿测试》2018年第6期705-712,共8页Rock and Mineral Analysis

基　　金：新疆维吾尔自治区天山英才培养工程项目;新疆维吾尔自治区2014年国家高层次人才特殊支持计划项目

摘　　要：哲兰德金矿是额尔齐斯构造带上重要的造山型金矿,产出于韧性剪切带中,金矿化赋存于黄铁矿化闪长岩脉、含金石英脉和黄铁矿化千枚岩中,矿化与韧脆性剪切变形有关。沿剪切面理发育的白云母、绿泥石等新生矿物,为测定金矿形成时代提供了依据。本研究利用白云母^(40)Ar/^(39)Ar年代学手段,确定了韧性剪切带的形成时代和金成矿时代。结果表明白云母坪年龄为295. 4±1. 6 Ma,韧性剪切变形和金成矿作用发生在295 Ma,略早于多拉纳萨依金矿形成时间。结合前人资料认为,新疆额尔齐斯构造带造山型金矿形成于295～270 Ma。BACKGROUND:The Zhelande gold deposit is an important orogenic gold deposit in the Irtysh tectonic belt.This deposit is hosted in the ductile shear zone.Mineralization occurs as gold-bearing pyritized diorite veins,gold-bearing quartz veins,and gold-bearing pyritized phyllite.The mineralization is related to the brittle-ductile shear deformation.Muscovite,chlorite and other new minerals occurred in the shear surface.OBJECTIVES:To determine the metallogenic age by^40Ar/^39Ar method.METHODS:Muscovite^40Ar/^39Ar dating was used to constrain the timing of ductile shear deformation and gold mineralization.RESULTS:Results show that the plateau age of the muscovite is 295.4±1.6 Ma,suggesting that the ductile shear deformation and gold mineralization occurred at about 295 Ma,slightly earlier than the formation of the Duolanasayi gold deposit.CONCLUSIONS:Combined with previous data,the orogenic gold deposits in the Irtysh tectonic belt of Xinjiang possibly formed at 295-270 Ma.

关 键 词：地质特征 40Ar/^39Ar年龄 造山型金矿 哲兰德 额尔齐斯构造带 

分 类 号：P597.3.[天文地球—地球化学] P619.27[天文地球—地质学]