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首页> 外文学位 >Zircon inclusion suite analysis of the Ashe Metamorphic Suite, North Carolina: Implications for exhumation history of eclogite.
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Zircon inclusion suite analysis of the Ashe Metamorphic Suite, North Carolina: Implications for exhumation history of eclogite.

机译：北卡罗莱纳州Ashe变质套件的锆石包裹体套件分析：对榴辉岩发掘史的影响。

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摘要

Previous research suggests the Ashe Metamorphic Suite (AMS) in northwestern North Carolina contains individual eclogite blocks which were entrained within an amphibolite-facies accretionary wedge. However, garnet inclusions within zircon from AMS amphibolite and amphibolite-facies biotite-hornblende gneiss preserve a record of near-peak eclogite-facies metamorphism. The Raman spectra from these garnet inclusions match a Raman spectrum from garnet inclusion within zircons in AMS eclogite. This indicates garnet inclusions from zircon in AMS amphibolite, biotite-hornblende gneiss, and eclogite have a similar composition forming under comparable P/T conditions. Inclusions in zircon from AMS eclogite include pyrope-rich garnet and omphacite, suggesting that zircon formed at near syn-peak eclogite-facies metamorphism. Therefore, growth of zircon in AMS amphibolite and biotite-hornblende gneiss occurred at near-eclogite facies conditions. These findings provide evidence that AMS eclogite, amphibolite, and biotite-hornblende gneiss once constituted a regional eclogite-facies terrane. This regional eclogite-facies terrane was likely exhumed by either extensional unroofing or slab extrusion.
机译：先前的研究表明，北卡罗来纳州西北部的Ashe变质套件（AMS）包含单个榴辉岩块，这些块岩被夹在两闪石相增生楔内。然而，AMS闪石和闪石相黑云母-角闪石片麻岩中的石榴石内含石榴石，保留了近峰榴辉岩相变质的记录。这些石榴石包裹体的拉曼光谱与AMS榴辉岩中锆石中石榴石包裹体的拉曼光谱匹配。这表明在可比较的P / T条件下，AMS闪石，黑云母-角闪石片麻岩和榴辉岩中锆石的石榴石包裹体具有相似的组成。 AMS榴辉岩中锆石中的夹杂物包括富吡啶石石榴石和绿辉石，这表明锆石形成于近峰峰榴辉岩相变质作用。因此，锆石在AMS闪石和黑云母角闪片麻岩中的生长发生在近榴辉岩相条件下。这些发现提供了证据，表明AMS榴辉岩，角闪石和黑云母角闪片麻岩曾经构成了一个区域榴辉岩相地层。该区域的榴辉岩相地层很可能是通过伸展的屋面或板状挤压而发掘出来的。

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  • 作者

    Dilts, Stefanie L.;

  • 作者单位

    The University of North Carolina at Chapel Hill.;

  • 授予单位 The University of North Carolina at Chapel Hill.;
  • 学科 Geology.; Geochemistry.
  • 学位 M.S.
  • 年度 2006
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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