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  1. 紀要論文
  2. 琉球大学理学部紀要
  3. 75号
  1. 部局別インデックス
  2. 理学部

Geology, structure and metamorphism of the Mai khola area, southwestern part of Ilam Bazaar, eastern Nepal

http://hdl.handle.net/20.500.12000/2618
http://hdl.handle.net/20.500.12000/2618
75663ade-80cd-420e-8294-ea1f11c961f9
名前 / ファイル ライセンス アクション
No75p55.pdf No75p55.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2007-12-10
タイトル
タイトル Geology, structure and metamorphism of the Mai khola area, southwestern part of Ilam Bazaar, eastern Nepal
言語 en
作成者 Chamlagain, Deepak

× Chamlagain, Deepak

en Chamlagain, Deepak

Rai, Santa Man

× Rai, Santa Man

en Rai, Santa Man

Hayashi, Daigoro

× Hayashi, Daigoro

en Hayashi, Daigoro

林, 大五郎

× 林, 大五郎

ja 林, 大五郎

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
内容記述
内容記述タイプ Other
内容記述 The study area consists of three tectonic zones from south to north, they are the Siwalik, Lesser Himalayan Sequence and Higher Himalaya Crystalline thrust sheet. The Lesser Himalayan Sequence is composed of chlorite, biotite and garnet grade metasediments and augen gneiss. The Higher Himalayan Crystalline thrust sheet is composed of kyanite to sillimanite grade paragneiss, orthogneiss and quartzite. The area is affected mainly by two deformational episodes (i) Syn-MCT metamorphic ductile deformation and (ii) Post-MCT metamorphic deformation. Syn-MCT metamorphic ductile deformation is characterized by (a) development of bedding-parallel foliation and syn-metamorphic stretching lineations trending NNE- SSW and (b) development of S-C structure. Three sub phases of the post-MCT metamorphic deformation are observed in the study area viz. (a) development of folds, (b) new generation of foliation and extensional shearing features and (c) small-scale brittle fault, shear bands and cross-cut veins.\nThe Lesser Himalayan Sequence has been metamorphosed to greenschist-amphibolite facies whereas the Higher Himalayan Crystalline thrust sheet has been metamorphosed to amphibolite to granulite facies. At least two metamorphic events could be recorded in the Lesser Himalayan Sequence. During Pre Himalayan metamorphic phase, the Lesser Himalayan Sequence might be metamorphosed up to anchizone grade prograde metamorphism(?). But Eo-Himalayan metamorphic phase could not affect the Lesser Himalayan Sequence. The Neo-Himalayan (Syn-MCT) metamorphic phase has been recorded on S-C fabric and is revealed by inverted metamorphic zonation in the Lesser Himalayan Sequence. The final phase in the Lesser Himalayan Sequence was retrograde phase shown by chloritization of garnet and biotite. At least three metamorphic events are recognized in the Higher Himalayan Crystalline thrust sheet of the study area. In the Eo-Himalayan (pre-MCT) metamorphic event kyanite grade prograde metamorphism has been occurred. This is followed by sillimanite grade retrograde metamorphism (lower P/high T) on the hanging wall of MCT and is assigned as Neo-Himalayan (Syn-MCT) metamorphic event. Finally the replacement of garnet and biotite by chlorite is the third (retrogressive metamorphic event) occurred during post MCT movement.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学理学部
言語
言語 eng
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/2618
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0286-9640
収録物識別子タイプ NCID
収録物識別子 AN00250774
収録物名
言語 ja
収録物名 琉球大学理学部紀要
書誌情報
号 75, p. 55-74
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