滇西始新世十里村正长岩的成因及构造意义  

Petrogenesis and tectonic implications of the Eocene Shilicun syenite from western Yunnan

作　　者：张江苏[1,2] 廖世勇[3] 刘铮 Zhang Jiang-su Liao Shi-yong Liu Zheng(College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China No.3 Geology and Mineral Exploration Team, Gansu Provincial Bureau of Geology and Mineral Explora- tion and Development, Lanzhou 730050, China Chengdu Institute of Geology and Mineral Resources, China Geological Surgey, Chengdu 610081, China School of Geological Sciences and Mineral Resources, Lanzhou University, Lanzhou 730000, China)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]甘肃省地矿局第三地质矿产勘查院,兰州730050 [3]中国地质调查局成都地质矿产研究所,成都610081 [4]兰州大学地质科学与矿产资源学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2017年第5期588-592,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家危机矿山接替资源找矿项目(200662061);中央高校基本科研业务费专项资金项目(lzujbky-2015-255)

摘　　要：十里村岩体出露于滇西哀牢山走滑断裂带附近,主要由石英碱长正长岩和石英正长岩构成,形成于始新世(~36.8 Ma).样品呈现出准铝质的特征,具有高碱、高Si、低Yb、低Y.Sr-Nd同位素值落在来自下地壳的斜长角闪岩捕虏体同位素范围内.岩石学和地球化学特征表明十里村岩体很可能产出在厚的岩石圈地幔移除诱发软流圈上涌的后碰撞环境下.The Shilicun pluton from western Yunnan is exposed adjacent to the Ailaoshan fault zone. It comprises quartz alkali-feldspar syenite and quartz syenite. The pluton was emplaced at ~36.8 Ma. All the samples,being metaluminous, have a high alkali content,high Sr and low Yb and low Y content.The initial Sr-Nd isotopic data were plotted in the field of xenolithes from the mafic lower crust. The occurrence of the Shilicun pluton indicated that the Cenozoic potassic magmatic belt was formed in a post-collisional setting, in response to asthenospheric upwelling triggered by removal of the thickened lithospheric mantle root.

关 键 词：正长岩 始新世 埃达克质岩石 十里村岩体 

分 类 号：P581[天文地球—岩石学]