Geologic and metamorphic evolution of the basement complexes in the Kontum Massif, central Vietnam

Nobuhiko Nakano, Yasuhito Osanai, M. Owada, Ngoc Nam Tran Ngoc Nam, T. Toyoshima, P. Binh, T. Tsunogae, H. Kagami

研究成果: ジャーナルへの寄稿記事

42 引用 (Scopus)

抄録

This paper presents a regional scale observation of metamorphic geology and mineral assemblage variations of Kontum Massif, central Vietnam, supplemented by pressure-temperature estimates and reconnaissance geochronological results. The mineral assemblage variations and thermobarometric results classify the massif into a low- to medium-temperature and relatively high-pressure northern part characterised by kyanite-bearing rocks (570-700 °C at 0.79-0.86 GPa) and a more complex southern part. The southern part can be subdivided into western and eastern regions. The western region shows very high-temperature (> 900 °C) and -pressure conditions characterised by the presence of garnet and orthopyroxene in both mafic and pelitic granulites (900-980 °C at 1.0-1.5 GPa). The eastern region contains widespread medium- to high-temperature and low-pressure rocks, with metamorphic grade increasing from north to south; epidote- or muscovite-bearing gneisses in the north (< 700-740 °C at < 0.50 GPa) to garnet-free mafic and orthopyroxene-free pelitic granulites in the south (790-920 °C at 0.63-0.84 GPa). The Permo-Triassic Sm-Nd ages (247-240 Ma) from high-temperature and -pressure granulites and recent geochronological studies suggest that the south-eastern part of Kontum Massif is composed of a Siluro-Ordovician continental fragment probably showing a low-pressure/temperature continental geothermal gradient derived from the Gondwana era with subsequent Permo-Triassic collision-related high-pressure reactivation zones.

元の言語英語
ページ(範囲)438-453
ページ数16
ジャーナルGondwana Research
12
発行部数4
DOI
出版物ステータス出版済み - 11 1 2007

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orthopyroxene
low pressure
garnet
Triassic
temperature
kyanite
geothermal gradient
mineral
epidote
reactivation
muscovite
Gondwana
rock
Ordovician
collision
geology

All Science Journal Classification (ASJC) codes

  • Geology

これを引用

Geologic and metamorphic evolution of the basement complexes in the Kontum Massif, central Vietnam. / Nakano, Nobuhiko; Osanai, Yasuhito; Owada, M.; Tran Ngoc Nam, Ngoc Nam; Toyoshima, T.; Binh, P.; Tsunogae, T.; Kagami, H.

:: Gondwana Research, 巻 12, 番号 4, 01.11.2007, p. 438-453.

研究成果: ジャーナルへの寄稿記事

Nakano, N, Osanai, Y, Owada, M, Tran Ngoc Nam, NN, Toyoshima, T, Binh, P, Tsunogae, T & Kagami, H 2007, 'Geologic and metamorphic evolution of the basement complexes in the Kontum Massif, central Vietnam', Gondwana Research, 巻. 12, 番号 4, pp. 438-453. https://doi.org/10.1016/j.gr.2007.01.003
Nakano, Nobuhiko ; Osanai, Yasuhito ; Owada, M. ; Tran Ngoc Nam, Ngoc Nam ; Toyoshima, T. ; Binh, P. ; Tsunogae, T. ; Kagami, H. / Geologic and metamorphic evolution of the basement complexes in the Kontum Massif, central Vietnam. :: Gondwana Research. 2007 ; 巻 12, 番号 4. pp. 438-453.
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abstract = "This paper presents a regional scale observation of metamorphic geology and mineral assemblage variations of Kontum Massif, central Vietnam, supplemented by pressure-temperature estimates and reconnaissance geochronological results. The mineral assemblage variations and thermobarometric results classify the massif into a low- to medium-temperature and relatively high-pressure northern part characterised by kyanite-bearing rocks (570-700 °C at 0.79-0.86 GPa) and a more complex southern part. The southern part can be subdivided into western and eastern regions. The western region shows very high-temperature (> 900 °C) and -pressure conditions characterised by the presence of garnet and orthopyroxene in both mafic and pelitic granulites (900-980 °C at 1.0-1.5 GPa). The eastern region contains widespread medium- to high-temperature and low-pressure rocks, with metamorphic grade increasing from north to south; epidote- or muscovite-bearing gneisses in the north (< 700-740 °C at < 0.50 GPa) to garnet-free mafic and orthopyroxene-free pelitic granulites in the south (790-920 °C at 0.63-0.84 GPa). The Permo-Triassic Sm-Nd ages (247-240 Ma) from high-temperature and -pressure granulites and recent geochronological studies suggest that the south-eastern part of Kontum Massif is composed of a Siluro-Ordovician continental fragment probably showing a low-pressure/temperature continental geothermal gradient derived from the Gondwana era with subsequent Permo-Triassic collision-related high-pressure reactivation zones.",
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AU - Tran Ngoc Nam, Ngoc Nam

AU - Toyoshima, T.

AU - Binh, P.

AU - Tsunogae, T.

AU - Kagami, H.

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AB - This paper presents a regional scale observation of metamorphic geology and mineral assemblage variations of Kontum Massif, central Vietnam, supplemented by pressure-temperature estimates and reconnaissance geochronological results. The mineral assemblage variations and thermobarometric results classify the massif into a low- to medium-temperature and relatively high-pressure northern part characterised by kyanite-bearing rocks (570-700 °C at 0.79-0.86 GPa) and a more complex southern part. The southern part can be subdivided into western and eastern regions. The western region shows very high-temperature (> 900 °C) and -pressure conditions characterised by the presence of garnet and orthopyroxene in both mafic and pelitic granulites (900-980 °C at 1.0-1.5 GPa). The eastern region contains widespread medium- to high-temperature and low-pressure rocks, with metamorphic grade increasing from north to south; epidote- or muscovite-bearing gneisses in the north (< 700-740 °C at < 0.50 GPa) to garnet-free mafic and orthopyroxene-free pelitic granulites in the south (790-920 °C at 0.63-0.84 GPa). The Permo-Triassic Sm-Nd ages (247-240 Ma) from high-temperature and -pressure granulites and recent geochronological studies suggest that the south-eastern part of Kontum Massif is composed of a Siluro-Ordovician continental fragment probably showing a low-pressure/temperature continental geothermal gradient derived from the Gondwana era with subsequent Permo-Triassic collision-related high-pressure reactivation zones.

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