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Anatexis, Deformation and Exhumation Mechanism for UHP Metamorphic Rocks: A Case Study in the North Qaidam and South Altyn UHP Terrane, Western China
Author(s) -
YU Shengyao,
ZHANG Jianxin,
LI Sanzhong,
PENG Yinbiao,
SUN Deyou
Publication year - 2017
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13091
Subject(s) - china , geology , chinese academy of sciences , beijing , prospecting , terrane , marine geology , geochemistry , geological survey , oceanography , earth science , archaeology , tectonics , seismology , geography , paleontology
In recent years, hydrous silicate melts by dehydrationdriven in situ partial melting constrained from experiments and natural rocks have been increasingly recognized in UHP rocks, indicating partial melting of UHP slab. Partial melting of UHP metamorphic rocks can dramatically affect the rheology of deeply subducted crust and thus play a crucial role in accelerating the exhumation of UHP slabs. Understanding the extent, conditions and timing of partial melting in UHP rocks in as many individual terranes as possible will therefore provide important constraints on tectonic models for exhumation of UHP metamorphic rocks. The North Qaidam and South Altyn UHP terrane of western China is ideally suited to study the relationship between metamorphism, anatexis, deformation and exhumation mechanism of UHP metamorphic rocks in collisional orogen.