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  1. H300 宇宙地球環境研究所
  2. H300a 雑誌掲載論文
  3. 学術雑誌

An integrated EPMA-EBSD study of metamorphic histories recorded in garnet

http://hdl.handle.net/2237/26596
http://hdl.handle.net/2237/26596
7469c052-e4d8-453a-9735-34e20f4a3b05
名前 / ファイル ライセンス アクション
Enami_et_al_2017_AM.pdf Enami_et_al_2017_AM.pdf ファイル公開:2018/01/01 (3.9 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-06-07
タイトル
タイトル An integrated EPMA-EBSD study of metamorphic histories recorded in garnet
言語 en
著者 Enami, Masaki

× Enami, Masaki

WEKO 72229

en Enami, Masaki

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Nagaya, Takayoshi

× Nagaya, Takayoshi

WEKO 72230

en Nagaya, Takayoshi

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Maw, Maw Win

× Maw, Maw Win

WEKO 72231

en Maw, Maw Win

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
キーワード
主題Scheme Other
主題 EBSD
キーワード
主題Scheme Other
主題 EPMA
キーワード
主題Scheme Other
主題 garnet
キーワード
主題Scheme Other
主題 polycrystals
キーワード
主題Scheme Other
主題 growth process
キーワード
主題Scheme Other
主題 metamorphism
抄録
内容記述タイプ Abstract
内容記述 Growth histories recorded in garnet grains in metasedimentary rocks from the Sanbagawa belt in Japan and the Mogok belt in Myanmar were analyzed using an effective combination of electron backscatter diffraction (EBSD) and electron probe microanalysis (EPMA) data. Garnet in the Sanbagawa metapelite has inner and outer zones that formed in the eclogite and epidote-amphibolite facies stages, respectively. Based on EPMA element mapping, this garnet appears to have grown as a single crystal with a temporal break in growth between the inner and outer zones that occurred during exhumation. The EBSD data, however, document that the garnet grain is composed of four domains. The misorientation angles of crystallographic orientations between the domains are as large as 59°, and domain boundaries crosscut the growth zoning and the compositional boundary between the inner and outer zones. Sets of quartz grains included in the garnets on either side of the domain boundaries sometimes share the same crystallographic orientation with misorientation angles less than 4°. The garnet grains formed via a three-step process of prograde crystallization of polycrystalline garnet during the eclogite facies stage (inner zone) → resorption around garnet rims and along domain boundaries during exhumation → crystallization of the outer zone and in the domain boundaries during the prograde epidote-amphibolite facies stage. The garnet porphyroblasts in the Mogok pelitic gneisses, which formed during prograde metamorphism to the upper amphibolite-granulite facies (0.6–1.0 GPa/780–850 °C), are now separated into segments of various sizes by mosaic or symplectite aggregates of biotite, plagioclase, and quartz or monomineralic biotite veins. The segment texture formed at about 0.3–0.4 GPa/610–650 °C or lower-grade conditions. The EBSD analysis shows that most of the segments share the same crystallographic orientation with misorientation angles less than 4° and show no evidence of deformation and/or rotation processes after segmentation. These data suggest that the Mogok sample did not experience dynamic deformation of the garnet grains after the resorption and segmentation stage and may have been exhumed under static conditions from depths of 9–12 km.
言語 en
出版者
出版者 Mineralogical Society of America
言語 en
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.2138/am-2017-5666
ISSN
収録物識別子タイプ PISSN
収録物識別子 0003-004X
書誌情報 en : American Mineralogist

巻 102, 号 1, p. 192-204, 発行日 2017-01
著者版フラグ
値 author
URI
識別子 http://doi.org/10.2138/am-2017-5666
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/26596
識別子タイプ HDL
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