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.
作者
刘国仁
李彦
王蕊
王海培
杨成栋
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)
出处
《岩矿测试》
CAS
CSCD
北大核心
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
