Metamorphic P-T-t path of mafic granulite in the Bashiwake area, South Altyn Tagh

被引：0
|
作者：
Guo J. [1 ]
Li Y. [2 ]
Zhang J. [3 ]
机构：
[1] College of Architectural and Surveying Engineering, Shanxi Datong University, Datong, 037001, Shanxi
[2] School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin
[3] Institute of Geology, Chinese Academy of Geological Sciences, Beijing
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2020年 / 94卷 / 09期
关键词：
Genetic mineralogy; Mafic granulite; P-T-t path; South Altyn Tagh; Zircon U-Pb dating;
D O I：
10.19762/j.cnki.dizhixuebao.2020178
中图分类号：
学科分类号：
摘要：
Deciphering the P-T-t path of high-pressure (HP) granulites in collisional orogeny can provide crucial constraints on the geodynamic evolution of subduction-exhumation especially in scenarios where linking of isotopic ages to the metamorphic evolution presents a challenge. Petrographic observations suggested that the studied mafic granulites have suffered multi-stage metamorphism, and the conventional geothermobarometry and the thermobarometry of rare earth element (REE) in garnet and clinopyroxene gave the P-T conditions of 17.5~22.6 kbar, 901~985℃ and 17~28 kbar,1012~1049℃ for HP-UHT stage, respectively. Zircon U-Pb dating of metamorphic zircons yielded an age of 491±3.5 Ma, representing the HP-UHT stage based on the REE distribution coefficients between zircon and garnet. © 2020, Science Press. All right reserved.
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页码：2698 / 2711
页数：13
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