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極東ネパールヒマラヤ泥質片麻岩の形成条件
https://doi.org/10.18999/sumrua.21.40
https://doi.org/10.18999/sumrua.21.40e444a53a-568f-4afa-b0c2-f9e650770d04
名前 / ファイル | ライセンス | アクション |
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21-6.pdf (3.0 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2011-05-09 | |||||
タイトル | ||||||
タイトル | 極東ネパールヒマラヤ泥質片麻岩の形成条件 | |||||
言語 | ja | |||||
その他のタイトル | ||||||
その他のタイトル | Formation condition of pelitic gneisses in far-eastern Nepal Himalaya | |||||
言語 | en | |||||
著者 |
今山, 武志
× 今山, 武志× Imayama, Takeshi |
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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 | Nepal Himalaya | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Main Central Thrust | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | THERMOCALC | |||||
抄録 | ||||||
内容記述 | The metamorphic pressure conditions at peak-T show a high field pressure gradient (c. 1.2-1.6 kbar/km) near the Main Central Thrust (MCT), which juxtaposes the high-grade Higher Himalayan Crystalline Sequences (HHCS) over the low-grade Lesser Himalaya Sequences (LHS) in far-eastern Nepal. Maximum recorded pressure conditions occur just above the MCT (-11 kbar), and decrease southward to -6 kbar in the garnet zone and northward to -7 kbar in the kyanite ± staurolite zone. Exhumation of the lowermost HHCS from deeper crustal depths than the flanking regions is perhaps caused by ductile extrusion along the MCT, not the emplacement along a single thrust. The peak metamorphic temperatures show a progressive increase of temperature structurally upward (c. 570 to 740 ℃) near the MCT and roughly isothermal conditions (c. 710-810 ℃) in the upper structural levels of the HHCS. The observed field temperature gradient is much lower than those predicted in channel flow models. However, the discrepancy could be resolved by taking into account heat advection by melt and/or fluid migrations, as these can produce low or nearly no field temperature gradient in the exhumed midcrust, as observed in nature. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | 第22回名古屋大学年代測定総合研究センターシンポジウム平成21(2009)年度報告 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | ja | |||||
出版者 | 名古屋大学年代測定資料研究センター | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
ID登録 | ||||||
ID登録 | 10.18999/sumrua.21.40 | |||||
ID登録タイプ | JaLC | |||||
書誌情報 |
ja : 名古屋大学加速器質量分析計業績報告書 巻 21, p. 40-45, 発行日 2010-03 |
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著者版フラグ | ||||||
値 | publisher |