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THE "BREAKING" AND "MAKING" OF CHARNOCKITES : EVIDENCE FROM THE EAST GONDWANIAN CRUSTAL FRAGMENTS
https://doi.org/10.15094/00002705
https://doi.org/10.15094/00002705a72e0157-0e4e-42f7-b964-84897d094d99
名前 / ファイル | ライセンス | アクション |
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KJ00002368288 (72.9 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1991-09-01 | |||||
タイトル | ||||||
タイトル | THE "BREAKING" AND "MAKING" OF CHARNOCKITES : EVIDENCE FROM THE EAST GONDWANIAN CRUSTAL FRAGMENTS | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002705 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
論文名よみ | ||||||
その他のタイトル | THE "BREAKING" AND "MAKING" OF CHARNOCKITES : EVIDENCE FROM THE EAST GONDWANIAN CRUSTAL FRAGMENTS | |||||
著者名よみ |
ヨシダ, マサル /
× ヨシダ, マサル / |
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著者名(英) |
YOSHIDA, Masaru
× YOSHIDA, Masaru× SANTOSH, M. |
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著者所属(英) | ||||||
en | ||||||
Department of Geosciences, Faculty of Science, Osaka City University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Geosciences, Faculty of Science, Osaka City University:Centre for Earth Science Studies | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Observed and published examples of the retrogression of regional charnockite masses (breaking) and in situ formation of veins and patches of "incipient charnockites" (making) in the East Gondwanian crustal fragments are presented. In southern India and Sri Lanka, charnockite masses of varying ages show hydrous alteration and retrogression into amphibolite facies gneisses. The incipient charnockites, constrained at ca. 500Ma, post-date the breaking events and form along fracture systems or pre-existing s-planes, reflecting relatively low pressure and shallow environments. In some places, the incipient charnockites are associated with pink granite veins, as in Kabbaldurga in S. India and Kurungegala in Sri Lanka. The latest tectonic regime in Sri Lanka, comprising the development of gentle folds, ductile faults and pink granite veining, identified as D_4 structures, is considered to compose a definite group of events which include the incipient charnockite formation. In the region around Lutzow-Holm Bay in East Antarctica, the tectonics associated with pink granite-pegmatite development are ductile faults, fractures and gentle folds, similar to those associated with the incipient charnockite formation in India and Sri Lanka. We consider that there is a close similarity in the tectonic environment of incipient charnockite formation and related phenomena of ca. 500Ma among the three Gondwana segments, namely, South India, Sri Lanka and East Antarctica. The differences in the occurrence of incipient charnockites or their association with pink granite veins may simply be a reflection of the different levels of uplift and denudation. Considered in this light, a genetically coeval event of charnockite making could be traced commonly in all the East Gondwanian crustal segments, which occurred during the waning stage of the last regional high grade metamorphism and uplift. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 5, p. 168, 発行日 1991-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |