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The compositional zoning of garnet in eclogite from western segment of Altyn Tagh, northwestern China and its dynamic significance

机译:中国西北地区阿尔金塔格西部段榴辉岩中石榴石的成分分区及其动态意义

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摘要

The eclogites from the Altyn Tagh, northwestern China have been subjected to medium- temperature and high-pressure metamorphism, and then overprinted by the amphibolite to granulite facies retrograde metamorphism. A complex compositional zoning was well preserved in the garnet porphyroblast formed during the metamorphism of eclogite facies. This zoning recorded P-T path of multistage metamorphism, and an early retrogressive process with features of Decreasing pressure and increasing temperature.
机译:来自中国西北地区阿尔金塔格的榴辉岩经历了中温和高压变质作用,然后被角闪石叠印成粒状相逆向变质作用。在榴辉岩相变质过程中形成的石榴石成卟啉细胞中保留了复杂的成分区带。该分区记录了多级变质作用的P-T路径,以及具有压力降低和温度升高特征的早期回退过程。

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