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

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2017,（15）
• 页码范围: 1048-1051
• 页数: 4页
• 语种: 英文

摘要

Coesite 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.