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Post-Collisional Volcanism of Kalamaili Suture Zone
详细信息   
摘要
///Kalamaili suture zone is an important plate boundary in north Xinjiang, and there are plenty of Neopaleozoic volcanic rocks around it. These volcanic rocks are enriched in LILEs and relatively depleted in HFSEs, and they are also characterized by high Nb, Zr, TiO2 contents and Zr/Y, Nb/Y ratios, and depleted Sr-Nd isotopes. The characteristics of these volcanic rocks suggest that they were produced in post-collisional period. The post-collisional volcanic rocks around Kalamaili suture zone become younger from west to east, which indicates that this suture zone entered post-collisional period gradually from west to east, and reflects that the Kalamaili Ocean had been closed gradually from west to east. As to the Kalamaili suture zone in post-collisional period, the lithosphere extended and thinned, and the asthenosphere materials upwelled and melted partially, and intensive mantle convection occurred, leading to a plenty of mantle-derived magmas underplating the suture zone. The lithospheric mantle metasomatized by fluid in subduction period melted partially under decompression and high temperature, the resulting melts contaminated the underplating asthenospheric materials, and the erupted lavas became the Neopaleozoic post-collisional volcanic rocks.

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