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首页> 外文期刊>Journal of Asian earth sciences >Petrology and U-Pb zircon dating of coesite-bearing metapelite from the Kebuerte Valley, western Tianshan, China
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Petrology and U-Pb zircon dating of coesite-bearing metapelite from the Kebuerte Valley, western Tianshan, China

机译：中国天山西部克布尔特山谷含钙云母变质岩的岩石学和U-Pb锆石测年

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摘要

This paper deals with the petrology and U-Pb dating of coesite-bearing garnet-phengite schist from the Kebuerte Valley, Chinese western Tianshan. It mainly consists of porphyroblastic garnet, phengite, quartz and chlorite with minor amounts of paragonite, albite, zoisite and chloritoid. The well preserved coesite inclusions (～100 μm) in garnet are encircled by a narrow rim of quartz. They were identified by optical microscopy and confirmed by Raman spectroscopy. Using the computer program THERMOCALC, the peak metamorphic conditions of 29 kbar and 565 ℃ were obtained via garnet isopleth geothermobarometry. The predicted UHP peak mineral assemblage comprises garnet +jadeite + lawsonite + carpholite + coesite + phengite. The metapelite records prograde quartz-eclogite-facies metamorphism, UHP coesite-eclogite-facies peak metamorphism, and a late greenschist-facies overprint. Phase equilibrium modeling predicts that garnet mainly grew in the mineral assemblages garnet+ jadeite +lawsonite + chloritoid + glaucophane + quartz + phengite and garnet +jadeite + lawsonite + carpholite + glaucophane + quartz + phengite. SHRIMP U-Pb zircon dating of the coesite-bearing metapelite yielded the peak metamorphic age 320.4 ± 3.7 Ma. For the first time, age data of coesite-bearing UHP metapelite from the Chinese western Tianshan are presented in this paper. They are in accord with published ages obtained from eclogite from other localities in the Chinese western Tianshan and the Kyrgyz South Tianshan and therefore prove a widespread occurrence of UHP metamorphism.
机译：本文研究了来自中国天山西部克布尔特山谷的含铅矾石石榴石-片岩片岩的岩石学和U-Pb测年。它主要由卟啉石石榴石，辉石，石英和绿泥石组成，并有少量的石楠石，钠长石，沸石，类绿藻石。石榴石中保存完好的矾土夹杂物（〜100μm）被狭窄的石英边缘包围。它们通过光学显微镜鉴定并通过拉曼光谱法确认。利用石榴石等值地热气压计，通过计算机程序THERMOCALC获得了29 kbar和565℃的峰值变质条件。预测的UHP峰值矿物组成包括石榴石+硬玉+钠钙钠石+千佛石+堇青石+锂铁矿。变质岩记录了石英-榴辉岩相变质的演化，UHP钙云母-榴辉岩相的峰质变质，以及晚期绿片岩相的叠印。相平衡模型预测，石榴石主要生长在石榴石+翡翠+钠钠锰石+绿藻石+玻镁石+石英+辉石岩和石榴石+翡翠+钠锰矿+钙铝石+钙铝石+葡甲醚+石英+铅锌矿的矿物组合中。含钴岩的变质岩的SHRIMP U-Pb锆石测年产生了320.4±3.7 Ma的峰值变质年龄。本文首次提出了来自中国西部天山的含Coeite的UHP变质岩的年龄数据。它们与从中国西部天山和吉尔吉斯南天山的其他地方的榴辉岩获得的公开年龄一致，因此证明了UHP变质的广泛发生。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第7期|295-307|共13页
  • 作者

    Xin Yang; Lifei Zhang; Zuolin Tian; Thomas Bader;

  • 作者单位

    The Key Laboratory ofOrogenk Belts and Crustal Evolution, MOE, School of Earth and Space Science, Peking University, Beijing 100871, China;

    The Key Laboratory ofOrogenk Belts and Crustal Evolution, MOE, School of Earth and Space Science, Peking University, Beijing 100871, China;

    The Key Laboratory ofOrogenk Belts and Crustal Evolution, MOE, School of Earth and Space Science, Peking University, Beijing 100871, China;

    The Key Laboratory ofOrogenk Belts and Crustal Evolution, MOE, School of Earth and Space Science, Peking University, Beijing 100871, China;

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  • 正文语种 eng
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  • 关键词

    Coesite; UHP metapelite; P-T pseudosection; U-Pb zircon dating; Chinese western Tianshan;

    机译：堇青石;超高压变质岩;P-T假切片;U-Pb锆石约会;中国西部天山;

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