1996 Fiscal Year Annual Research Report

インド東ガ-トグラニュライト帯の変成作用と造構史の研究

Research Project

Project/Area Number	08454160
Research Category	Grant-in-Aid for Scientific Research (B)
Research Institution	Osaka City University
Principal Investigator	吉田勝大阪市立大学, 理学部, 教授 (30047112)
Keywords	インド楯状地 / 東ガ-ト帯 / グラニュライト / ミグマタイト / ゴンドワナランド
Research Abstract	東ガ-トグラニュライト帯中部のヴィサカパトナム周辺地域とその北方約200kmのテッカリ周辺地域を選び、詳しい構造地質学的岩石学的研究を実施した。ヴィサカパトナム周辺地域は、主として変表成岩類のコンダライトとレプチナイトからなり、チャルノカイトと花崗岩の貫入岩体が分布する。野外資料の解析の結果、この地域の一般構造は東西で、これに北北西-南南東及び北東-南西の軸面片理を持つ褶曲構造が重複していることが分かった。テッカリ周辺地域には、変表成岩類中に特徴的なガ-ネットミグマタイト岩体が数10km直径のまとまった岩体として分布する。ミグマタイト岩類の微組織解析、造岩鉱物の微小領域分析、全岩化学組成分析の結果、ミグマタイトは周辺の変表成岩類とよく似た岩石を源岩として、その急速な非平行溶融によって形成したこと、溶融は約11kb900ACの条件で行われ、その後ほぼ等圧で温度が約650ACまで降下したことが判った。ヴィサカパトナム周辺地域およびテッカリ周辺地域の岩類には流体包有物が特徴的に含まれていることが判ったが、具体的な分析・解析は次年度に実施することになった。ヴィサカパトナム周辺地域の重複変形事件とそれらの特徴は、従来の東ガ-ト帯の構造史に関する理解(例えばNarayanasuwamy, 1975, Yoshida et al., 1994)と整合的であり、今後さらに詳しい検討を進めることによって具体的な構造特徴を明らかにし、東ゴンドワナの他の陸片地域と対比することが可能であろう。テッカリ周辺で得られたミグマタイト化事件の実態は、従来の東ガ-ト帯における変成作用に関する理解の枠組みにはあてはまらず、今後の詳しい検討が必要である。

Research Products
(13 results)

All Other

All Publications (13 results)

[Publications] Yoshida, M. & Santosh, M.: "Southernmost Indian Peninsular and the Gondwanaland." Condwana Research Group Memoir 3 "The Archaean and Proterozoic Terrains of Southern India. Field Science Pub., Osaka.15-24 (1996)
[Publications] Chandran, R. R. et al., including Yoshida, M.: "proterozoic mineralization in southern Kerala : summary characteristics and genesis." Condwana Research Group Memoir 3 "The Archaean and Proterozoic terrains of Southern India. Field Science Pub., Osaka.117-144 (1996)
[Publications] Ajith-Kumar, S. et al. including Yoshida, M.: "The pyroxene granulites of Kunnampara, Trivandrum Block, southern India." Gondwana Research Group Memoir 3 "The Archaean and Proterozoic terrains of Southern India. Field Science Pub., Osaka.327-332 (1996)
[Publications] Yoshida, M. et al.: "Three major reworking events in the India-Sri Lanka-Antarctic sector of East Gondwana." Gondwana 9 (vol. 2). Oxford and IBH Pub., New Delhi.983-988 (1996)
[Publications] Yoshida, M. & Santosh, M.: "Precambrian India within East Gondwana : Introduction." Jour. Southeast Asian Earth Sciences.14・3-4. 117-118 (1996)
[Publications] Yoshida, M. et al.: "Geochronologic constraints of granulite terrains of South India and its implication to the Precambrian Gondwana assembly." Jour. Southeast Asian Earth Sciences.14・3-4. 137-147 (1996)
[Publications] Nagaswara Rao et al., including Yoshida, M.: "Geochemical characters of leptynites from Visakhapatnam area in Eastern Ghats Granulite Terrain." Jour. Southeast Asian Earth Sciences.14・3-4. 199-208 (1996)
[Publications] Rajesh. H. M. et al., including Yoshida, M.: "The felsic magmatic province in East Gondwana : Implications for Pan-African tectonics." Jour. Southeast Asian Earth Sciences.14・3-4. 275-291 (1996)
[Publications] Rao, A. T. et al., including Yoshida, M.: "Petrography and geochemistry of banded iron formation from Ongole-Konijedu area in the Eastern Ghats Belt, South India." Indian Mineralogists. (印刷中). (1997)
[Publications] Rao, A. T. et al., including Yoshida, M.: "Whole rock and mineral chemistry of aluminous granulites from the Eastern Ghats Granulite Belt, A. P., India." Jour. Geol. Soc. India. (印刷中).
[Publications] Santosh, M. & Yoshida, M. (editors): "The Archean and Proterozoic Terrains of Southern India Within East Gondwana." Field Science Publishers (Osaka)., 403 (1996)
[Publications] Yoshida, M. Santosh, M. & (editors): "Precambrian India Within East Gondwana. Special Issue of Jour. Southeast Asian Earth Sciences." Pergamon/Elsevier (Oxford), 329 (1996)
[Publications] Rao, A. T. Divi, R. S. & Yoshida, M.: "Crustal Section of Peninsular Gneiss-Gondwana-Eastern Ghats, India. Field Excursion Guide Book." Geological Society of India (Bangalore)(印刷中), (1997)

1996 Fiscal Year Annual Research Report

インド東ガ-トグラニュライト帯の変成作用と造構史の研究

Principal Investigator

吉田 勝 大阪市立大学, 理学部, 教授 (30047112)

Research Products

[Publications] Yoshida, M. & Santosh, M.: "Southernmost Indian Peninsular and the Gondwanaland." Condwana Research Group Memoir 3 "The Archaean and Proterozoic Terrains of Southern India. Field Science Pub., Osaka.15-24 (1996)

[Publications] Chandran, R. R. et al., including Yoshida, M.: "proterozoic mineralization in southern Kerala : summary characteristics and genesis." Condwana Research Group Memoir 3 "The Archaean and Proterozoic terrains of Southern India. Field Science Pub., Osaka.117-144 (1996)

[Publications] Ajith-Kumar, S. et al. including Yoshida, M.: "The pyroxene granulites of Kunnampara, Trivandrum Block, southern India." Gondwana Research Group Memoir 3 "The Archaean and Proterozoic terrains of Southern India. Field Science Pub., Osaka.327-332 (1996)

[Publications] Yoshida, M. et al.: "Three major reworking events in the India-Sri Lanka-Antarctic sector of East Gondwana." Gondwana 9 (vol. 2). Oxford and IBH Pub., New Delhi.983-988 (1996)

[Publications] Yoshida, M. & Santosh, M.: "Precambrian India within East Gondwana : Introduction." Jour. Southeast Asian Earth Sciences.14・3-4. 117-118 (1996)

[Publications] Yoshida, M. et al.: "Geochronologic constraints of granulite terrains of South India and its implication to the Precambrian Gondwana assembly." Jour. Southeast Asian Earth Sciences.14・3-4. 137-147 (1996)

[Publications] Nagaswara Rao et al., including Yoshida, M.: "Geochemical characters of leptynites from Visakhapatnam area in Eastern Ghats Granulite Terrain." Jour. Southeast Asian Earth Sciences.14・3-4. 199-208 (1996)

[Publications] Rajesh. H. M. et al., including Yoshida, M.: "The felsic magmatic province in East Gondwana : Implications for Pan-African tectonics." Jour. Southeast Asian Earth Sciences.14・3-4. 275-291 (1996)

[Publications] Rao, A. T. et al., including Yoshida, M.: "Petrography and geochemistry of banded iron formation from Ongole-Konijedu area in the Eastern Ghats Belt, South India." Indian Mineralogists. (印刷中). (1997)

[Publications] Rao, A. T. et al., including Yoshida, M.: "Whole rock and mineral chemistry of aluminous granulites from the Eastern Ghats Granulite Belt, A. P., India." Jour. Geol. Soc. India. (印刷中).

[Publications] Santosh, M. & Yoshida, M. (editors): "The Archean and Proterozoic Terrains of Southern India Within East Gondwana." Field Science Publishers (Osaka)., 403 (1996)

[Publications] Yoshida, M. Santosh, M. & (editors): "Precambrian India Within East Gondwana. Special Issue of Jour. Southeast Asian Earth Sciences." Pergamon/Elsevier (Oxford), 329 (1996)

[Publications] Rao, A. T. Divi, R. S. & Yoshida, M.: "Crustal Section of Peninsular Gneiss-Gondwana-Eastern Ghats, India. Field Excursion Guide Book." Geological Society of India (Bangalore)(印刷中), (1997)

吉田勝大阪市立大学, 理学部, 教授 (30047112)