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Discovery of the Mafic Granulites in the Muzhaerte area, SW Tianshan, China
Version 1
: Received: 29 August 2023 / Approved: 29 August 2023 / Online: 30 August 2023 (14:11:45 CEST)
A peer-reviewed article of this Preprint also exists.
Yan, J.; Cui, Y.; Liu, X. Discovery of Mafic Granulites in the Muzhaerte Area, SW Tianshan, China. Minerals 2023, 13, 1214. Yan, J.; Cui, Y.; Liu, X. Discovery of Mafic Granulites in the Muzhaerte Area, SW Tianshan, China. Minerals 2023, 13, 1214.
Abstract
Accretionary and collisional orogeny are often accompanied by the disturbance of the geothermal gradient, leading to high-temperature metamorphism. High-temperature metamorphic rocks are significant in their ability to help the reconstruction of the thermal histories of orogenic belts. The Tianshan Orogenic Belt, at the southwest margin of the Central Asian Orogenic Belt, is a record of the long-term subduction–collision–post-collision orogenic process that has taken place in the Phanerozoic Eon. Here, we report the discovery of mafic granulites in the Muzhaerte area, SW Tianshan. Petrographic observation reveals that the mafic granulites underwent two metamorphic stages. The peak mineral assemblages of the first stage are dominated by clinopyroxene + orthopyroxene + plagioclase + quartz + hornblende ± biotite, and the post-peak mineral assemblages of the second stage are dominated by clinopyroxene + plagioclase + quartz + amphibole + biotite. The calculated results obtained from the two-pyroxene thermobarometers and the Al-in-hornblende barometer for the mafic granulites indicate that the metamorphic conditions of mafic granulites are 760–860 ℃ and < 0.39–0.41 Gpa. The mafic granulites recorded a high-grade granulite facies thermal metamorphic event with the highest temperature limit currently recorded in the Central Tianshan Block.
Keywords
mafic granulites; Tianshan; Muzhaerte; high-temperature metamorphism; geothermobarometry
Subject
Environmental and Earth Sciences, Geochemistry and Petrology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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