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 other
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.
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)
