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首页> 外文期刊>Journal of Asian earth sciences >Metamorphic evolution of eclogites and associated metapelites from the Yuka terrane in the North Qaidam ultrahigh pressure metamorphic belt, NW China: Constraints from phase equilibrium modeling
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Metamorphic evolution of eclogites and associated metapelites from the Yuka terrane in the North Qaidam ultrahigh pressure metamorphic belt, NW China: Constraints from phase equilibrium modeling

机译：中国西北部柴达木超高压变质带尤卡地块榴辉岩和伴生变质岩的变质演化：相平衡模拟的约束

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摘要

As the products of early Paleozoic continental collision, widespread eclogite facies rocks crop out in the Yuka terrane, western North Qaidam Mountains, NW China. Eclogites commonly reach ultrahigh pressure (UHP) metamorphic conditions. However, whether the associated metapelitic rocks also experience UHP metamorphism has not been thoroughly elucidated to date. In this contribution, we chose two eclogite samples and one metapelite sample to investigate their metamorphic evolution. Combining with petrographic observation and P-T pseudosections, similar clockwise P-T paths with peak stages at 25-34 kbar, 580-633 degrees C were obtained for eclogites and metapelites. Eclogite ZM871 records a prograde metamorphic condition at 21.6 kbar/552 degrees C, defined by the assemblage garnet + omphacite + epidote + lawsonite + talc (+ quartz + phengite + rutile) and a peak metamorphic condition at 34.0 kbar/633 degrees C by the assemblage garnet + omphacite + lawsonite + talc ( + coesite + phengite + rutile). Eclogite ZM641 records a prograde metamorphic condition at 21.5 kbar/520 degrees C, defined by the assemblage garnet + omphacite + glaucophane + lawsonite ( +quartz + phengite + rutile) and a peak condition at 30 kbar/616 degrees C by the assemblage garnet + omphacite + lawsonite + talc ( + quartz + phengite + rutile). Metapelite ZM8-1 records a prograde metamorphic condition at 18.2 kbar/530 degrees C defined by the assemblage garnet + chloritoid + chlorite ( + quartz + phengite + rutile), a peak condition at 25 kbar/580 degrees C by the assemblage garnet + kyanite + chloritoid ( + quartz + phengite + rutile), and a retrograde condition at 16.2 kbar/595-598 degrees C by the assemblage garnet + kyanite + chloritoid + chlorite ( + quartz + phengite + rutile). Combined with previous data from orthogneiss and impure marble in the Yuka terrane, which also recorded UHP metamorphic conditions, the Yuka eclogite-bearing unit commonly underwent UHP metamorphism, although further investigation is warranted to verify whether the Yuka unit represents a single coherent UHP metamorphic terrane or a collage of different UHP metamorphic slices.
机译：作为早期古生代大陆碰撞的产物，广泛的榴辉岩相岩石在中国西北部柴达木山脉西部的尤卡地貌中生长。榴辉岩通常达到超高压（UHP）变质条件。但是，至今尚未完全阐明相关的变质岩是否也经历了UHP变质作用。在这项贡献中，我们选择了两个榴辉岩样品和一个变质岩样品来研究它们的变质演化。结合岩相观测和P-T假剖面，获得了类似的顺时针P-T路径，其榴辉岩和变石的峰期在25-34 kbar，580-633摄氏度。榴辉岩ZM871记录了在21.6 kbar / 552摄氏度下的渐进变质状态，由组合石榴石+绿沸石+绿橄榄石+钠长石+滑石（+石英+锂铁矿+金红石）定义，并在34.0 kbar / 633摄氏度下达到了峰值变质状态。石榴石+绿榴石+钙钠锰石+滑石（+堇青石+锂铁矿+金红石）。榴辉岩ZM641在21.5 kbar / 520摄氏度下记录了一个渐进变质状态，由组合石榴石+绿沸石+葡甲酰胺+钙钠榴石（+石英+锂铁矿+金红石）定义，在30 kbar / 616摄氏度下由组合石榴石+绿辉石+钠钙钠石+滑石粉（+石英+锂铁矿+金红石）。变质石ZM8-1在组合石榴石+类固醇+亚氯酸盐+亚氯酸盐（+石英+辉石+金红石）定义的18.2 kbar / 530摄氏度下记录了一个渐进变质状态，在组合石榴石+蓝晶石的情况下，在25 kbar / 580摄氏度下出现了峰值状态。 +类盐（+石英+锂铁矿+金红石），并在组合石榴石+蓝晶石+类盐+亚氯酸盐（+石英+锂铁矿+金红石）下于16.2 kbar / 595-598℃逆行。结合以前也记录过UHP变质条件的原片麻岩和不纯大理石的数据，尤卡含榴石的单元通常经历了UHP变质，尽管有必要进行进一步研究以验证Yuka单元是否代表单个相干的UHP变质地层。或不同UHP变质片的拼贴。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第15期|161-175|共15页
  • 作者

    Zhou Guisheng; Zhang Jianxin; Yu Shengyao; Li Yunshuai; Lu Zenglong; Mao Xiaohong; Teng Xia;

  • 作者单位

    Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Land & Resources, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Land & Resources, Beijing 100037, Peoples R China;

    Ocean Univ China, Submarine Geosci & Prospecting Tech, MOE, Qingdao 266100, Shandong, Peoples R China|Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Shandong, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Land & Resources, Beijing 100037, Peoples R China|Tianjin Univ, Inst Surface Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Land & Resources, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Land & Resources, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Land & Resources, Beijing 100037, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Phase equilibrium modeling; Eclogites; Metapelites; North Qaidam; Yuka;

    机译：相平衡模型榴辉岩陨石柴达木北部尤卡;

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