Discovery of coesite in eclogite from Keqike Jianggalesayi: new evidence for ultrahigh-pressure metamorphism in South Altyn Tagh, northwestern China  

作　　者：Yongsheng Gai Liang Liu Chao Wang Wenqiang Yang Lei Kang Yuting Cao Xiaoying Liao 

机构地区：[1]State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University [2]College of Earth Science and Engineering, Shandong University of Science and Technology

出　　处：《Science Bulletin》2017年第15期1048-1051,共4页科学通报（英文版）

基　　金：supported by funds from the Key Project of National Natural Science Foundation of China (41430209);the Major State Basic Research Development Projects (2015CB856103);Most Special Fund from the State Key Laboratory of Continental Dynamics, Northwest University (BJ081331, 201210133);the National Natural Science Foundation of China (41020201, 41402045, 41602052);the Gold Geological Party of Chinese Armed Police Force Project (DD20160079)

摘　　要：Coesite is a polymorph of Si O2formed at speci?c high-pressure conditions, and its presence in some crustal rocks as relicts marks the exhumation of deep subducted material to mantle depths, thus providing robust evidence for the hypothesis on ultrahigh pressur (UHP) metamorphism [1]. The discovery of coesite and otherCoesite is a polymorph of SiO2 formed at specific high-pressure conditions, and its presence in some crustal rocks as relicts marks the exhumation of deep subducted material to mantle depths, thus providing robust evidence for the hypothesis on ultrahigh pressure （UHP） metamorphism [1 ]. The discovery of coesite and other UHP index minerals have added new dimensions to the geodynamic models at lithospheric plate convergent boundaries and continental subduction-collision zones.

关 键 词：超高压变质作用 柯石英榴辉岩 中国西北 证据 阿尔金 地球动力学模型 岩石圈板块 SiO2 

分 类 号：P588.3[天文地球—岩石学] P445.4[天文地球—地质学]