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首页> 外文期刊>Journal of Asian earth sciences >Diverse mineral compositions, textures, and metamorphic P-T conditions of the glaucophane-bearing rocks in the Tamayen melange, Yuli belt, eastern Taiwan
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Diverse mineral compositions, textures, and metamorphic P-T conditions of the glaucophane-bearing rocks in the Tamayen melange, Yuli belt, eastern Taiwan

机译：台湾东部玉里带塔马延混杂岩中含葡聚糖的岩石的矿物成分，质地和变质P-T条件

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This paper presents new petrologic data for high-pressure, low-temperature (HP-LT) metamorphic rocks at Juisui. We reinterpret the so-called "Tamayen block" (Yang and Wang, 1985) or "Juisui block" (Liou, 1981; Beyssac et al., 2008) as a tectonic melange. It is not a coherent sheet but rather a mixture dominated by greenschist and pelitic schist with pods of serpentinite, epidote amphibolite, and rare blueschist. Four types of glaucophane-bearing rocks are newly recognized in this melange. Type 1 is in contact with greenschist lacking glaucophane and garnet. Glaucophane is present only as rare inclusions within parg-asite. This type records metamorphic evolution from epidote blueschists-, epidote amphibolite-, to green-schist-facies. Type II contains characteristic zoned amphiboles from barroisite core to Mg-katophorite mantle and glaucophane rim, implying an epidote amphibolite-facies stage overprinted by an epidote blueschists-facies one. Type III includes winchite and indicates P-T conditions of about 6-8 kbar, approaching 400 ℃. Type IV contains paragonite but lacks garnet; amphibole shows a Na-Ca core surrounded by a glaucophane rim. This type shows a high-pressure (?) epidote amphibolite-facies stage overprinted by an epidote blueschists-facies one. Amphibole zoning trends and mineral assemblages imply contradictory P-T paths for the four types of glaucophane-bearing rocks—consistent with the nature of a tectonic melange. The new P-T constraints and petrologic findings differ from previous studies (Liou et al., 1975; Beyssac et al., 2008).
机译：本文介绍了瑞穗高压，低温（HP-LT）变质岩的新岩石学数据。我们将所谓的“ Tamayen地块”（Yang和Wang，1985）或“ Juisui地块”（Liou，1981； Beyssac等人，2008）重新解释为构造混杂岩。它不是一个连贯的片材，而是由绿片岩和片岩片岩和蛇纹石，山茱ote闪石和稀有的蓝片岩构成的混合物。在这种混杂物中新发现了四种类型的含葡聚糖的岩石。 1型与缺乏葡甘露糖和石榴石的绿党接触。 Glaucophane仅以parg-asite中的稀有夹杂物形式存在。这种类型记录了从附子blueschists-，附子角闪石-到绿色片岩相的变质演化。 II型包含特征性的带状闪石，从钡铁矿岩心到镁-钾镁辉石地幔和青光岩边缘，暗示着带状的蓝闪石相叠印的带状的闪石岩相阶段。类型III包括Winchite，指示P-T条件约为6-8 kbar，接近400℃。 IV型含有方石，但缺乏石榴石。闪石显示出一个Na-Ca核，周围被一个葡聚糖环所包围。这种类型显示出高压（？）的史密斯闪石岩相阶段被史密斯蓝化岩相盖印。闪石的地带化趋势和矿物组合暗示了四种类型的含玻璃石的岩石的P-T路径相互矛盾，这与构造混杂岩的性质一致。新的P-T约束和岩石学发现与以前的研究不同（Liou等，1975； Beyssac等，2008）。

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