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华北克拉通北缘西段宝音图群片岩中石榴子石变斑晶成分特征及其动力学意义
Authors
彭润民
闫岩
陆彬
陈思雨
Publication date
1 January 2019
Publisher
Abstract
石榴子石变斑晶微结构和成分特征对构造和变质作用研究有重要作用。本文以华北克拉通北缘西段宝音图群石榴子石云母片岩中的石榴子石变斑晶为研究对象,通过扫描电子显微镜搭载的二次电子(SE)显微结构形貌观测,背散射电子(BSE)成分分析、能谱仪(EDS)和电子探针(EPMA)分析,得到石榴子石变斑晶组构和化学成分信息,揭示出石榴子石晶界具有化学非均质性。在MnNCFMASHO体系下采用石榴子石云母石英片岩的全岩成分计算的锰铝榴石、钙铝榴石等值线图基础上,建立了石榴子石变斑晶的p-t轨迹,反映出石榴子石变斑晶在变质峰期后经历了一个近等温降压的地质动力学过程
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Last time updated on 11/04/2021