孙载波, 胡绍斌, 周坤, 周听全, 赵江泰, 王云晓, 张星培, 张生泽, 王慧宁, 王巍. 滇西澜沧谦迈地区榴辉岩岩石学、矿物学特征及变质演化p-T轨迹[J]. 地质通报, 2019, 38(7): 1105-1115.
    引用本文: 孙载波, 胡绍斌, 周坤, 周听全, 赵江泰, 王云晓, 张星培, 张生泽, 王慧宁, 王巍. 滇西澜沧谦迈地区榴辉岩岩石学、矿物学特征及变质演化p-T轨迹[J]. 地质通报, 2019, 38(7): 1105-1115.
    SUN Zaibo, HU Shaobin, ZHOU Kun, ZHOU Tingquan, ZHAO Jiangtai, WANG Yunxiao, ZHANG Xingpei, ZHANG Shengze, WANG Huining, WANG Wei. Petrology, mineralogy and metamorphic p-T path of eclogites from the Qianmai area, Lancang County, western Yunnan Province[J]. Geological Bulletin of China, 2019, 38(7): 1105-1115.
    Citation: SUN Zaibo, HU Shaobin, ZHOU Kun, ZHOU Tingquan, ZHAO Jiangtai, WANG Yunxiao, ZHANG Xingpei, ZHANG Shengze, WANG Huining, WANG Wei. Petrology, mineralogy and metamorphic p-T path of eclogites from the Qianmai area, Lancang County, western Yunnan Province[J]. Geological Bulletin of China, 2019, 38(7): 1105-1115.

    滇西澜沧谦迈地区榴辉岩岩石学、矿物学特征及变质演化p-T轨迹

    Petrology, mineralogy and metamorphic p-T path of eclogites from the Qianmai area, Lancang County, western Yunnan Province

    • 摘要: 澜沧谦迈地区位于西南三江昌宁-孟连结合带中段。新近在该地区发现榴辉岩,与双江县勐库地区退变榴辉岩一样,谦迈地区榴辉岩也产于湾河蛇绿混杂岩带内,岩石新鲜,后期退变质作用改造弱,岩石学信息保留完整。主要矿物成分为石榴子石、绿辉石、多硅白云母、金红石、角闪石、绿帘石、石英等,直接围岩为白云(钠长)片岩和斜长角闪岩,白云(钠长)片岩主要由多硅白云母、石英和长石构成。根据岩石学和矿物学特征将谦迈地区榴辉岩划分为4个变质阶段,其中峰期矿物组合为石榴子石+绿辉石+多硅白云母+硬柱石+蓝闪石+金红石+石英。初步研究表明,峰期榴辉岩相变质温度和压力分别为600℃和2.5GPa。新发现的榴辉岩为研究三江地区特提斯构造演化提供了关键性资料,该榴辉岩变质演化p-T轨迹的研究对探讨古特提斯洋的俯冲-造山过程具有重要意义。

       

      Abstract: Eclogite was newly discovered in the Qianmai area within the Changning-Menglian suture zone in the Sangjiang area, southwest China. Qianmai eclogites, like retrograded eclogites in the Mengku area of Shuangjiang County, occur within the Wanhe ophiolitic mélange. The studied eclogites are fresh with weak retrogression. The main mineral compositions include garnet, omphacite, phengite, rutile, amphibole, epidote and quartz. The surrounding rocks include muscovite (albite) schist and plagioclase amphibolite. The muscovite (albite) schist is mainly composed of phengite, quartz and feldspar. Four-stage metamorphic evolution was identified in according to the petrological and mineralogical analyses. The peak mineral association includes garnet+omphacite+ phengite+ lawsonite+glaucophane+rutile+quartz. The peak eclogite-facies metamorphic temperature and pressure are 600℃ and 2.5GPa, respectively. The newly discovered eclogite provides important information for the study of the Tethyan tectonic evolution in Sanjiang region. The metamorphic p-T path of the eclogites is of great significance for investigating the subduction-orogeny process of the Paleo-Tethys Ocean.

       

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