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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Geologic and metamorphic evolution of the basement complexes in the Kontum Massif, central Vietnam
Gondwana Research, Volume 12, No. 4, Year 2007
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Description
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. © 2007 International Association for Gondwana Research.
Authors & Co-Authors
Nakano, Nobuhiko
Japan, Fukuoka
Kyushu University
Osanai, Yasuhito
Japan, Fukuoka
Kyushu University
Owada, Masaaki
Japan, Yamaguchi
Yamaguchi University
Toyoshima, Tsuyoshi
Japan, Niigata
Niigata University
Tsunogae, Toshiaki
Japan, Tsukuba
University of Tsukuba
Kagami, Hiroo
Japan, Niigata
Niigata University
Statistics
Citations: 71
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.gr.2007.01.003
ISSN:
1342937X