新疆巴音布鲁克地区那拉提岩群变质岩原岩恢复及成因环境探讨  

Reconstruction of Protoliths of Metamorphic Rocks and Genetic Environment of the Nalati Group in Bayanbulak,Xinjiang

作　　者：凤骏 穆利修 王哲 李平 屈涛 Feng Jun;Mu Lixiu;Wang Zhe;Li Ping;Qu Tao(Xinjiang Institute of Geological Survey,Urumqi,Xinjiang,831100,China)

机构地区：[1]新疆维吾尔自治区地质调查院,新疆乌鲁木齐831100

出　　处：《新疆地质》2017年第4期407-416,共10页Xinjiang Geology

摘　　要：将巴音布鲁克地区艾尔宾山西段格尔廷恩郭勒一带原划为中泥盆统萨阿尔明组古老的具高绿片岩相-角闪岩相的变质岩重新厘定为古元古界那拉提岩群。对那拉提岩群变质岩岩石特征、原岩性质及形成构造环境研究表明,其主体为一套副变质岩系。其中,片麻岩、变粒岩的原岩为杂砂岩、亚杂砂岩、岩屑砂岩及硅铁质沉积岩。斜长角闪片岩和角闪斜长片麻岩的原岩为玄武质沉凝灰岩或基性火山杂砂岩,为副变质火山碎屑岩。构造环境判别表明,那拉提岩群变质岩以被动大陆边缘构造环境为主,可能经历了从被动大陆边缘向活动大陆边缘转化的构造过程。The authors designated the ancient、high greenschist to amphibolite facies metamorphosed rock series used to be considered as Saaerming formation of Middle Devonian as Palaeoproterozoic Nalati Group,which located in west Eerbin mountain,Bayanbulak.Based on the study of rock characteristics and nature of the protoliths,the tectonic setting shows that the main body of Nalati Group should belong to a pair of metamorphic rocks,gneiss,granulite protolith greywacke,sub greywacke and sedimentary lithic sandstone,silicon iron.Amphibolite schist and amphibolite plagioclase gneiss protolith of basaltic tuff or mafic volcano greywacke,parametamorphic volcano clastic rocks.Tectonic discrimination shows that Nalati Group metamorphic rocks in passive continental margin tectonic environment,and it may be changed from passive continental margin to active continental margin tectonic transformation process.

关 键 词：巴音布鲁克 那拉提岩群 原岩恢复 成因环境 

分 类 号：P588.3[天文地球—岩石学]