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Intergranular coesite and coesite inclusions in dolomite from the Dabie Shan: Constraints on the preservation of coesite in UHP rocks
Author(s) -
Liu Penglei,
Massonne HansJoachim,
Zhang Junfeng,
Wu Yao,
Jin Zhenmin
Publication year - 2017
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/ter.12258
Subject(s) - coesite , dolomite , geology , intergranular corrosion , geochemistry , mineralogy , eclogite , materials science , subduction , microstructure , tectonics , metallurgy , paleontology
Intergranular coesite is extremely rare in, and bears crucial information on the formation and preservation of, ultrahigh‐pressure ( UHP ) rocks. Here, we report the first occurrence of intergranular coesite in a metasedimentary rock, which occurs in the Ganjialing area in the Dabie Shan, east‐central China, and contains abundant coesite inclusions in both garnet and dolomite. We investigated the content of structural water in these minerals with Fourier transform infrared spectroscopy. Our new results undermine the ubiquity of the “pressure‐vessel” model and highlight the role of reaction kinetics in preserving coesite due to the availability of water in UHP rocks.