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赣中变质岩带变质作用PTt轨迹演化及其地质意义*

, PP. 176-174

Keywords: 赣中变质岩带,石榴石环带,微区成分,P-T轨迹,大陆碰撞带,活动大陆边缘

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Abstract:

赣中变质岩带十字石榴云母片岩中石榴石成分环带是连续反应的结果,微区成分变化规律明显。本文根据该岩石的石榴石环带成分定量计算了变质作用P-T轨迹。P-T轨迹样式表明,赣中变质岩带的变质作用可以分两大期:第一期发生在大陆碰撞带环境中,变质作用的温度压力演化受均匀地壳增厚及隆起侵蚀过程控制;第二期发生在活动大陆边缘环境,变质作用温压条件与地壳回返上升,高温热流上涌有关。

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