1998 年度実績報告書

インド東ガートグラニュライト帯の変成作用と造構史の研究

研究課題

研究課題/領域番号	08454160
研究機関	大阪市立大学
研究代表者	吉田勝大阪市立大学, 理学部, 教授 (30047112)
キーワード	インド楯状地 / 東ガート帯 / グラニュライト / 重複変動 / ゴンドワナランド / 原生代
研究概要	東ガート帯中部のヴィサカパトナム周辺地域の構造地質学的検討を実施したほか、平成8、9年度の研究成果をもとに、東ガート帯全体の変成造構史を考察し、さらに、周辺のゴンドワナ陸片地域の造構史との対比を行った。ヴィサカパトナム周辺地域では、早期の折り畳み褶曲やシース褶曲などの3時期の過褶曲構造と、後期の軸面急傾から垂直の等斜褶曲、開いた褶曲、塑性剪断、脆性剪断の少なくとも7時期の構造が認められ、2あるいは3の重複変動を被っていることが窺われた。さらに、変成作用は、13kb・1150℃を越す高圧高温条件から等温減圧、等圧降温〜等温減圧の少なくとも2回の等温減圧事件を示しており、これも複変動帯の特徴を持っていることが指摘される。年代データから見ると、主変成作用は約12〜14億年前のアルカリ深成岩類の貫入事件の前で、約20億年前と約15億年前と考えられる。その後、約10億年前にも圧縮場におけるグラニュライト変成作用があり、さらに約8億年前と約5億年前には、花崗岩の貫入を伴う再変動があった。東ガート帯西縁部分では約28〜26億年前の変成年代が得られている。この部分は基盤の再変動地帯であろう。東ガート帯のこのような多時階の変動は、そのすべてを周辺のゴンドワナ陸片に追跡することは出来ない。同帯の北東延長にあたる南西オーストラリアのアルバニー・フレイサー帯では、約10億年前変動とそれより古い事件が、南東延長である南極のナピア・レイナー帯では、10億年変動とそれより新しい事件が、よく追跡される。このことは、約10億年前頃に、東ガート帯周辺のゴンドワナ陸片地域に大きなテクトニクスの変換が生じたことを示していると考えられる。以上の研究成果は、国外誌や英文紀要等の学術論文7編、英文の論文集などの書籍2冊、国際学会などにおける学術講演12題として公表された。

研究成果
(24件)

すべてその他

すべて文献書誌 (24件)

[文献書誌] Bindu,R.S.,Yoshida,M.& Santosh,M.*: "Electron microprobe dating of monazite from Chittikara granulite,South India:Evidence for polymetamorphic events." Jour.Geosci.,Osaka City University. No.41. 77-83 (1998)
[文献書誌] Rajesh,H.M.他4名*: "Pigeonite exolution in pyroxene phenocrysts from a massive anorthosite in South India:Implications for petrogenesis." Indian Mineralogist. v.32. 30-31 (1998)
[文献書誌] Rajesh,M.,Santosh,M.& Yoshida,M.*: "Exsolution features in pyroxene phenocrysts from an anorthosite massif in northern Kerala,South India." Jour.Geosci.,Osaka City University. No.41. 85-107 (1998)
[文献書誌] Rajesh,H.M.他4名*: "Large-scale silicate liquid immiscibility:A possible example from South India." Indian Mineralogist. v.32. 31-32 (1998)
[文献書誌] Satish-Kumar,M.他4名*: "Fluid flow along micro-fractures in calcite marbles oxigen isotopic zonation." Geology. vol.23. 251-254 (1998)
[文献書誌] Tani,Yasutaka他5名*: "Some Structural observations in the Eastern Ghats Mobile Belt surrounding Visakhapatnam,South India." Jour.Geosci.,Osaka City University. No.41. 109-122 (1998)
[文献書誌] Yamamoto,Tetsuya他4名*: "Migmatite of the Tekkali area,central Eastern Ghats,India." Jour.Geosci.,Osaka City University. No.41. 123-142 (1998)
[文献書誌] Yoshida,Masaru,ほか15名*: "Geological Survey of southern to eastern Peninsular India,1996." Jour.Geosci.,Osaka City University. No.41. 47-75 (1998)
[文献書誌] Bindu,R.S.ほか3名: "The first report of CHIME monazite age from the South Indian granulite terrain." Current Science. v.74. 852-858 (1998)
[文献書誌] A.T.Rao,Satyanarayana,P.V.V.& Yoshida,M.: "Geothermometry of coexiting pyroxenes from Chimakurti Anorthosite Complex at the contact of Eastern Ghats Granulite and Nellore Granite-Greenstone Belt,A.P.,India" Gondwana Research Group Memoir. No.4. 165-184 (1998)
[文献書誌] Yoshida,M.,Bindu,R.S.& Santosh,M.: "Electron microprobe monazite ages from the Trivandrum Granulite Belt of South India." Journal of African Earth Sciences,Special Abstracts Issue,Gondwana 10:Event Stratigraphy of Gondwana. v.27. 216-217 (1998)
[文献書誌] Kovach,V.ほか6名: "U-Pb zircon age and Nd isotope systematics of megacrystic charnockites in the Eastern Ghats Granulite Belt,India,and their implications for East Gondwana Rec." Journal of African Earth Sciences,Special Abstracts Issue,Gondwana 10:Event Stratigraphy of Gondwana. v.27. 125-127 (1998)
[文献書誌] Binu-La1,S.S.,Santosh,M.& Yoshida,M.: "Shear-zone hosted Proterozoic vein gold mineralization in the Wynad Gold Field.India." Gondwana Res.Group Miscl.Publ.(Abstracts,Intn'l.Sem.Prcambrian Crust in Eastern and Central India,UNESCO-IUGS-IGCP-368,1998). No.8. 179-181 (1998)
[文献書誌] Bindu,R.S.,Yoshida,M.& Santosh,M.: "Multiple metamorphism in Eastern Ghats Granulite Belt:Evidence from Electron microprobe monazite ages." Gondwana Res.Group Miscl.Publ.(Abstracts,Intn'l.Sem.Prcambrian Crust in Eastern and Central India,UNESCO-IUGS-IGCP-368,1998). No.8. 123-125 (1998)
[文献書誌] Rajesh,H.M.,Santosh,M.& Yoshida,M.: "Progressive exsolution in pyroxene phenocrysts from an anorthositic mass in South India:Implications for petrogenesis." Gondwana Res.Group Miscl.Publ.(Abstracts,Intn'l.Sem.Prcambrian Crust in Eastern and Central India,UNESCO-IUGS-IGCP-368,1998). No.8. 223-224 (1998)
[文献書誌] Moses,V.C.B,Ram Mohan,V.& Yoshida,M.: "Mineralogy and metamorphic history of the garnetiferous granulites from the Archaean layered complexes of the Bhavani Shear Zone,in the South Indian G T." Gondwana Res.Group Miscl.Publ.(Abstracts,Intn'l.Sem.Prcambrian Crust in Eastern and Central India,UNESCO-IUGS-IGCP-368,1998). No.8. 246-247 (1998)
[文献書誌] Yoshida,Masaru,et al.: "Field studies of Proterozoic terrains in Peninsular India and Sri Lanka during 1997-1998." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)
[文献書誌] Rajneesh-Kumarほか3名: "Structural features around the Archaean-Proterozoic terrain boundarya in Kammam District,South India." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)
[文献書誌] Hari Prasadほか3名: "Structural features of the Archaean Ncllore-Kammam Schist Belt,southeastern India" Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)
[文献書誌] Moses,B.V.C.ほか3名: "Geochemical charactersitics of mafic granulites and associated websterites from the Sittampundi Complex,South India." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)
[文献書誌] Yamamoto,T.: Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)
[文献書誌] Satish-Kumar,M.: "An overview of petrologic characteristics of granulite facies metacarbonate rock from the Trivandrum Block,southern India." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)
[文献書誌] Yoshida,M.ほか3名: "Eastern Ghats and Surrounding Areas within East Gondwana" Field Science Publishers(Osaka), 456 (1998)
[文献書誌] Rao,A.T.,Divi,R.S.& Yoshida,M.: "Precambrian Crustal Processes in East Coast Granulite-Greenstone Regions of India and Antarctica within East Gondwana" Field Science Publishers(Osaka), 198 (1998)

1998 年度 実績報告書

インド東ガートグラニュライト帯の変成作用と造構史の研究

研究代表者

吉田 勝 大阪市立大学, 理学部, 教授 (30047112)

研究成果

[文献書誌] Bindu,R.S.,Yoshida,M.& Santosh,M.*: "Electron microprobe dating of monazite from Chittikara granulite,South India:Evidence for polymetamorphic events." Jour.Geosci.,Osaka City University. No.41. 77-83 (1998)

[文献書誌] Rajesh,H.M.他4名*: "Pigeonite exolution in pyroxene phenocrysts from a massive anorthosite in South India:Implications for petrogenesis." Indian Mineralogist. v.32. 30-31 (1998)

[文献書誌] Rajesh,M.,Santosh,M.& Yoshida,M.*: "Exsolution features in pyroxene phenocrysts from an anorthosite massif in northern Kerala,South India." Jour.Geosci.,Osaka City University. No.41. 85-107 (1998)

[文献書誌] Rajesh,H.M.他4名*: "Large-scale silicate liquid immiscibility:A possible example from South India." Indian Mineralogist. v.32. 31-32 (1998)

[文献書誌] Satish-Kumar,M.他4名*: "Fluid flow along micro-fractures in calcite marbles oxigen isotopic zonation." Geology. vol.23. 251-254 (1998)

[文献書誌] Tani,Yasutaka他5名*: "Some Structural observations in the Eastern Ghats Mobile Belt surrounding Visakhapatnam,South India." Jour.Geosci.,Osaka City University. No.41. 109-122 (1998)

[文献書誌] Yamamoto,Tetsuya他4名*: "Migmatite of the Tekkali area,central Eastern Ghats,India." Jour.Geosci.,Osaka City University. No.41. 123-142 (1998)

[文献書誌] Yoshida,Masaru,ほか15名*: "Geological Survey of southern to eastern Peninsular India,1996." Jour.Geosci.,Osaka City University. No.41. 47-75 (1998)

[文献書誌] Bindu,R.S.ほか3名: "The first report of CHIME monazite age from the South Indian granulite terrain." Current Science. v.74. 852-858 (1998)

[文献書誌] A.T.Rao,Satyanarayana,P.V.V.& Yoshida,M.: "Geothermometry of coexiting pyroxenes from Chimakurti Anorthosite Complex at the contact of Eastern Ghats Granulite and Nellore Granite-Greenstone Belt,A.P.,India" Gondwana Research Group Memoir. No.4. 165-184 (1998)

[文献書誌] Yoshida,M.,Bindu,R.S.& Santosh,M.: "Electron microprobe monazite ages from the Trivandrum Granulite Belt of South India." Journal of African Earth Sciences,Special Abstracts Issue,Gondwana 10:Event Stratigraphy of Gondwana. v.27. 216-217 (1998)

[文献書誌] Binu-La1,S.S.,Santosh,M.& Yoshida,M.: "Shear-zone hosted Proterozoic vein gold mineralization in the Wynad Gold Field.India." Gondwana Res.Group Miscl.Publ.(Abstracts,Intn'l.Sem.Prcambrian Crust in Eastern and Central India,UNESCO-IUGS-IGCP-368,1998). No.8. 179-181 (1998)

[文献書誌] Yoshida,Masaru,et al.: "Field studies of Proterozoic terrains in Peninsular India and Sri Lanka during 1997-1998." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)

[文献書誌] Rajneesh-Kumarほか3名: "Structural features around the Archaean-Proterozoic terrain boundarya in Kammam District,South India." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)

[文献書誌] Hari Prasadほか3名: "Structural features of the Archaean Ncllore-Kammam Schist Belt,southeastern India" Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)

[文献書誌] Moses,B.V.C.ほか3名: "Geochemical charactersitics of mafic granulites and associated websterites from the Sittampundi Complex,South India." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)

[文献書誌] Yamamoto,T.: Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)

[文献書誌] Satish-Kumar,M.: "An overview of petrologic characteristics of granulite facies metacarbonate rock from the Trivandrum Block,southern India." Jour.Geosci.,Osaka City University. No.42(印刷中). (1999)

[文献書誌] Yoshida,M.ほか3名: "Eastern Ghats and Surrounding Areas within East Gondwana" Field Science Publishers(Osaka), 456 (1998)

[文献書誌] Rao,A.T.,Divi,R.S.& Yoshida,M.: "Precambrian Crustal Processes in East Coast Granulite-Greenstone Regions of India and Antarctica within East Gondwana" Field Science Publishers(Osaka), 198 (1998)

1998 年度実績報告書

吉田勝大阪市立大学, 理学部, 教授 (30047112)