新疆塔什库尔干岩群变质岩原岩及产出构造环境研究  

Research on Protolith and Tectonic Setting of Tashenkuergan Group Metamorphic Rocks in Tatulugou Area,Xinjiang Autonomous Region,China

作　　者：和志鹏[1,2] 刘继顺[1,2] 康亚龙[1,2,3] 

机构地区：[1]中南大学教育部有色金属成矿预测重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]四川省核工业地质调查院,四川成都610052

出　　处：《矿物学报》2017年第3期314-320,共7页Acta Mineralogica Sinica

摘　　要：新疆塔吐鲁沟地区大地构造位置属羌塘—三江造山系的塔什库尔干—甜水海陆块。塔什库尔干岩群构成了本区元古代结晶基底,主要为1套由区域变质作用形成的高绿片岩相-低角闪岩相变质岩系,其原岩和产出构造背景尚不明确。岩石学特征及岩石地球化学特征等研究表明,其原岩为1套正常沉积的碎屑岩夹基性-中酸性火山岩及碳酸盐岩建造,形成于板块拉张阶段的大陆裂谷、弧后盆地和稳定陆缘构造环境,分别反映了大陆裂解、洋壳形成及洋壳稳定伸展的大地构造背景,有助于进一步认识该区的地壳演化。Geotectonically, Tatulugou area is in Tashenkuergan-Tianshuihai landmass of Qiangtang Sanjiang orogenic belt, and Tashenkuergan group is Proterozoic basement. The group is mainly composed of a series of metamorphic rocks, which were metamorphised through high green-schist-low amphibolite faeies metamorphic series by regional metamorphism with uncertainty on protolith and tectonic setting. Research results of the characteristics of petrology and rock geochemistry of this sequence of rocks indieate that its protolith is a series of common sedimentary fragments rock construction with basicntermediate-acid volcanics with a little carbonatite. The tectonic environment of Tashenkuergan group is continental rift, back are basin and stable continental margin ocean basin of extension environment. These analytical results reflect the tectonic setting of continental splitting, the formation and extension of oceanic crust, which is helpful for the further study on crust evolution of this area.

关 键 词：变质岩 原岩 构造环境 塔什库尔干岩群 塔吐鲁沟 

分 类 号：P588.14[天文地球—岩石学]