Late Permian plume-related magmatism and tectonothermal events in the Kontum Massif, central Vietnam

Masaaki Owada, Yasuhito Osanai, Nobuhiko Nakano, Tatsuro Adachi, Ippei Kitano, Tran Van Tri, Hiroo Kagami

研究成果: ジャーナルへの寄稿記事

6 引用 (Scopus)

抄録

The Kontum Massif is situated in the southern part of Trans Vietnam Orogenic Belt (TVOB), central Vietnam, and contains various types of magmatic and metamorphic rocks, the latter including both ultrahigh-pressure and ultrahigh-temperature units. While geochronological data indicate the existence of two main tectonothermal events at 480-420 Ma and 270-240 Ma, the most intense metamorphic and magmatic activity occurred between the Late Permian and Early Triassic due to continental collision between the South China and Indochina cratons. In this study, U-Pb LA-ICP-MS geochronological analyses of zircon obtained from two samples of metagabbro and one sample of charnockite from the massif yielded a magmatic age range of 260-250 Ma for all three samples and an inherited age of ~ 1400 Ma for the charnockite. These magmatic ages overlap with those documented for peak metamorphism in the Kontum Massif. When combined with Nd isotopic data for granitic rocks and pelitic gneisses from the region, these data suggest that the massif may have been derived from reworked continental crust. Geochemical characteristics of metagabbros from the massif reveal that the parental basaltic magma can be correlated with the Song Da igneous suite situated in the northern part of the TVOB, and was assimilated by crustal materials. The Song Da igneous suite is a member of the Emeishan large igneous province and resulted from Late Permian mantle plume activity. We conclude that the plume-related magma intruded into the deeper part of Kontum Massif and induced ultrahigh-temperature metamorphism of the lower crust by acting as a heat source.

元の言語英語
ページ(範囲)181-195
ページ数15
ジャーナルJournal of Mineralogical and Petrological Sciences
111
発行部数3
DOI
出版物ステータス出版済み - 7 22 2016

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Vietnam
plumes
magmatism
charnockite
Permian
plume
song
orogenic belt
magma
crusts
ultrahigh temperature metamorphism
rocks
metagabbro
large igneous province
metamorphic rocks
inductively coupled plasma mass spectrometry
cratons
continental collision
mantle plume
heat source

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology

これを引用

Late Permian plume-related magmatism and tectonothermal events in the Kontum Massif, central Vietnam. / Owada, Masaaki; Osanai, Yasuhito; Nakano, Nobuhiko; Adachi, Tatsuro; Kitano, Ippei; Van Tri, Tran; Kagami, Hiroo.

:: Journal of Mineralogical and Petrological Sciences, 巻 111, 番号 3, 22.07.2016, p. 181-195.

研究成果: ジャーナルへの寄稿記事

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abstract = "The Kontum Massif is situated in the southern part of Trans Vietnam Orogenic Belt (TVOB), central Vietnam, and contains various types of magmatic and metamorphic rocks, the latter including both ultrahigh-pressure and ultrahigh-temperature units. While geochronological data indicate the existence of two main tectonothermal events at 480-420 Ma and 270-240 Ma, the most intense metamorphic and magmatic activity occurred between the Late Permian and Early Triassic due to continental collision between the South China and Indochina cratons. In this study, U-Pb LA-ICP-MS geochronological analyses of zircon obtained from two samples of metagabbro and one sample of charnockite from the massif yielded a magmatic age range of 260-250 Ma for all three samples and an inherited age of ~ 1400 Ma for the charnockite. These magmatic ages overlap with those documented for peak metamorphism in the Kontum Massif. When combined with Nd isotopic data for granitic rocks and pelitic gneisses from the region, these data suggest that the massif may have been derived from reworked continental crust. Geochemical characteristics of metagabbros from the massif reveal that the parental basaltic magma can be correlated with the Song Da igneous suite situated in the northern part of the TVOB, and was assimilated by crustal materials. The Song Da igneous suite is a member of the Emeishan large igneous province and resulted from Late Permian mantle plume activity. We conclude that the plume-related magma intruded into the deeper part of Kontum Massif and induced ultrahigh-temperature metamorphism of the lower crust by acting as a heat source.",
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T1 - Late Permian plume-related magmatism and tectonothermal events in the Kontum Massif, central Vietnam

AU - Owada, Masaaki

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AU - Adachi, Tatsuro

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AU - Kagami, Hiroo

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