2004 Fiscal Year Final Research Report Summary
Crust-formaticn processes in the Kontum Massif, Vietnam
| Project/Area Number |
14340150
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Kyushu University (2004)
Okayama University (2002-2003) |
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Principal Investigator |
OSANAI Yasuhito Kyushu University, Graduate School of Social and Cultural Studies, Professor, 大学院・比較社会文化研究院, 教授 (80183771)
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| Co-Investigator(Kenkyū-buntansha) |
ITAYA Tetsumaru Okayama University of Science, Research Inst Natural Sc., Professor, 自然科学研究所, 教授 (60148682)
OWADA Masaaki Yamaguchi University, Faculty of Science, Associate Professor, 理学部, 助教授 (50213905)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Vitnam / Kontum Massif / ultrahigh-temperature metamorphism / ultrahigh-pressure metamorphism / metamorphic evolution / precise geochronology / collision metamorphism / super-continent formation |
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| Research Abstract |
The Kontum massif in central Vietnam consists of low-grade schists and amphibolite- to granulite-facies metamorphic rocks, that have been intruded by S-type and I-type granites. This terrane was formerly considered to be composed mainly of Archean granulites (the Kannak Complex), Proterozoic amphibolite-facies metamorphic rocks (the Ngoc Linh Complex) and low-grade schists (the Kham Duc Complex). They were thought to be the basement of the Indochina Craton in south-east Asia. The Kannak Complex is dominated by pelitic-semipelitic gneisses metamorphosed under high- to ultrahigh-temperature (UHT) conditions into granulite-facies. A minor amount of mafic and calcsilicate rocks are also intercalated within the gneisses. The highest-grade metamorphic condition is determined from garnet-orthopyroxene-sillimanite-cordierite gneiss, which indicates that multi-stage symplectite formation during retrograde stage started from isothermal decompression in UHT condition (1000 ℃<). On the other hand,
… More
the newly found garnet-clinopyroxene-orthopyroxene granulites (eclogitic ultrahigh-temperature mafic granulite) from the Ngoc Linh Complex shows a series of changes in divariant assemblages from garnet-clinopyroxene-quartz to hornblende-quartz through clinopyroxene-orthopyroxene- plagioclase-(garnet). It was identified that these rocks were formed as a result of their metamorphic evolution of isothermal decompression followed by nearly isobaric cooling.
The ultrahigh-temperature metamorphic rocks in the Kontum massif, which are exposed along the Dac To Kan shear zone, show a clockwise pressure-temperature path with the peak metamorphic condition of ca. 1.2 GPa and ca. 1050 ℃ (M1 metamorphism). High-pressure M0 metamorphism (ca. 1.7 GPa<, ca. 1000 ℃) as part of the prograde metamorphism and low-pressure (but still ultrahigh-temperature) M2 metamorphism (0.9-1.0 GPa,ca. 1000 ℃) as part of the retrograde metamorphism during the clockwise pressure-temperature evolution are also recognized. The widely reported Permo-Triassic metamorphic event (ca. 240-260 Ma) from the ultrahigh-temperature metamorphic rocks would indicate a rapid metamorphic evolution from M0 stage to low-pressure and low-temperature retrograde stage (later M2 stage) during the continents collision in eastern Asia. The newly determined Sm-Nd internal isochron and SHRIMP ages from the Kannak and Ngoc Linh Complexes would also indicate that the Kontum massif had also undergone the Pan African metamorphic event (ca. 2.5,1.0 and 0.5 Ga). The present results of the metamorphic evolution of the Kontum massif including 41 journal papers indicate a strong constraint to consider the coninental evolution process in Eastern Asia. Less
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[Journal Article] Permo-Triassic ultrahigh-temperture metamorphism in Kontum Massif, central Vietnam.2004
Author(s)
Osanai, Y., Nakano, N., Owada, M., Nam, T.N., Toyoshima, T., Tsunogae, T., Binh, P.
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Journal Title
Jour.Mineral.Petrol.Sci. 99
Pages: 225-241
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Decompresslon process of mafic granulite from eclogite to granulite facies under ultrahigh-temperature condition in the Kontum masif, central Vietnam.2004
Author(s)
Nakano, N., Osanai, Y., Owada, M., Tran Ngoc Nam, Tsunogae, T., Toyoshima, T., Pham Binh
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Journal Title
Jour.Mineral.Petrol.Sci. 99
Pages: 242-256
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Geological map of Skallen (Revised Edition), Antarctica.2004
Author(s)
Osanai, Y., Toyoshima, T., Owada, M., Tsunogae, T., Hokada, T., Crowe, WA., Ikeda, T., Kawakami, T., Kawano, Y., Kawasaki, T., Ishikawa, M., Motoyoshi, Shiraishi, K.
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Journal Title
Antarctic Geological Map Series, Sheet 39. National Institute of Polar Research
Pages: 23-23
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] New finding of granulite-facies metamorphic rocks from Sefuri Mountains, northern Kyushu.2004
Author(s)
Owada, M., Hata, R., Yada, J., Nakamura, M., Osanai, Y.
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Journal Title
Jour.Geol.Soc.Japan 111
Pages: 50-53
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Variety and genesis of the pyroxene bearing S- and l-type granitoids from the Hidaka Metamorphic Belt, Hokkaido, northern Japan.2004
Author(s)
Shimura, T., Owada, M., Osanai, Y., Komatsu, M., Kagami, H.
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Journal Title
Trans.Royal Soc.Edinburgh, Earth Sci. 95
Pages: 161-179
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Metamorphic evolution of high-pressure and ultrahigh-temperture granulites from the Kontum Massif, central Vietnam.2004
Author(s)
Osanai, Y., Nakano, N., Owada, M., Nam, T.N., Toyoshima, T., Tsunogae, T., Binh, P., Kagami, H.
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Journal Title
Gondwana Research 7
Pages: 1360-1363
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Finding of UHP metamorphic rocks from the Kontum Massif, central Vietnam.2004
Author(s)
Nakano, N., Osanai, Y., Owada, M., Tran Ngoc Nam, Tsunogae, T., Pham Binh
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Journal Title
Gondwana Research 7
Pages: 1350-1352
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Petrogenesis of the Late Permian Plei Man Ko granite in the Kontum Massif, central Vietnam.2004
Author(s)
Owada, M., Osanai, Y., Nakano, N., Nam, T.N., Binh, P., Matsushita, T., Tsunogae, T., Toyoshima, T., Kagami, H.
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Journal Title
Gondwana Research 7
Pages: 1363-1365
Description
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[Journal Article] Fluid-rock history of lower crustal metacarbonate rocks from Skallen, Lutzow Holm Bay, East Antarctica.2004
Author(s)
Satish-Kumar, M., Miyamoto, T., Tsunogae, T., Wada, H., Osanai, Y.
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Journal Title
Gondwana Res. 7
Pages: 1381-1382
Description
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[Journal Article] Metamorphism and tectonic evolution of the Kontum Massif, Vietnam.2003
Author(s)
Osanai, Y., Nakano, N., Owada, M., Tran Ngoc Nam, Toyoshima, T., Tsunogae, T., Kagami, H.
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Journal Title
Earth Monthly 25
Pages: 244-251
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Metamorphism and geochronology of UHT-HP mafic granulites from the Kontum Massif, Vietnam.2003
Author(s)
Nakano, N., Osanai, Y., Owada, M., Tran Ngoc Nam, Suzuki, S., Kagami, H.
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Journal Title
Earth Monthly 25
Pages: 236-243
Description
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[Journal Article] Early Proterozoic tectonothermal events in the Napier Complex, East Antarctica : implication to the formation of East Gondwana.2003
Author(s)
Owada, M., Osanai, Y., Toyoshima, T., Tsunogae, T., Hokada, T., Crowe, W.A., Kagami, H.
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Journal Title
Gondwana Research 6
Pages: 231-240
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Evolution of the highest-grademetamorphic rocks from central Highland Complex, Sri Lanka.2003
Author(s)
Osanai, Y., Sajeev, K., Owada, M., Kehelpannala, K.V.VV., Prame, W.K.B.N., Nakano, N., Jayatileke, S.
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Journal Title
Proceedings of the IGCP-440 and LEGENDS International Symposium and Field Workshop on The Role of Sri Lanka in Rodinia and Gondwana Assembly and Break-up (ed.Kehelpannala, W.)(Centenary Publ., Geol.Surv.Mines Bureau, Sri Lanka)
Pages: 25-31
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Retrograde tectonothermal events in the Napier Complex, East Antarctica : Correlation with the East Gondwana fragments2003
Author(s)
Owada, M., Osanai, Y., Toyoshima, T., Tsunogae, T., Hokada, T., Crowe, W.A., Kagami, H.
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Journal Title
Proceedings of the IGCP-440 and LEGENDS International Symposium and Field Workshop on The Role of Sri Lanka in Rodinia and Gondwana Assembly and Break-up (ed.Kehelpannala, W.)(Centenary Publ., Geol.Surv.Mines Bureau, Sri Lanka)
Pages: 76-78
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] High fluorine pargasites in ultrahigh temperature granulites from Tonagh Island in the Archean Napier Complex, East Antarctica.2003
Author(s)
Tsunogae, T., Osanai, Y., Owada, M., Toyoshima, T., Hokada, T., Crowe, W.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Crustal section and anatexis of lower crust due to mantle flux in the Hidaka metamorphic belt, Hokkaido, Japan.2003
Author(s)
Owada, M., Osanai, Y., Shimura, T., Thyoshima, T., Katsui, Y.
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Journal Title
Geological Survey of Japan, Interim-Report no.28
Pages: 81-102
Description
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[Journal Article] Fluid inclusions in an osumilite-bearing granulite from Bunt Island in the Archean Napier Complex, East Antarctica : implications for a clockwise P-T path?2003
Author(s)
Tsunogae, T., Santosh, M., Osanal, Y., Owada, M., Toyoshima, T., Hokada, T., Crowe, W.
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Journal Title
Polar Geoscinece 16
Pages: 61-75
Description
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[Journal Article] Resetting and closing condition of Rb-Sr whole-rock isochron system : some samples of metamorphic and granitic rocks from the Gondwana super-continent and Japan Arc.2003
Author(s)
Kagami, H., Shimura, T., Yuhara, M., Owada, M., Osanai, Y., Shiraishi, K.
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Journal Title
Polar Geoscinece 16
Pages: 227-242
Description
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[Journal Article] Very high-density carbonic fluid inclusions in sapphirine-bearing granulites from Tonagh Island in the Arcean Napier Complex, East Antarctica : implications for CO_2 infiltration during ultrahigh-temperature (T>1100℃) metamorphism.2002
Author(s)
Tsunogae, T., Santosh, M., Osanai, Y., Owada, M., Toyoshima, T., Hokada, T
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Journal Title
Contrib.Mineral.Petrol. 143
Pages: 279-299
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] SHRIMP geochronology of a mylonite zone on Tonagh Island : characterisation of the last high-grade tectonothermal event in the Napier Complex, East Antarctica.2002
Author(s)
Crowe, W.A., Osanai, Y., Toyoshima, T., Owada, M., Tsunogae, T., Hokada, T.
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Journal Title
Polar Geoscinece 15
Pages: 17-36
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Metamorphic evolution of ultrahigh-temperature and high-pressure granulites from the Highland Complex, Sri Lanka.
Author(s)
Osanai, Y., Sajeev, K., Owada, M., Kehelpannala, K.V.W., Prame, W.K.B, Nakano, N., Jayatileke, S.
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Journal Title
Jour.Asian Earth Sci. 21(in press)
Description
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