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

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doi: 10.1016/
Authors:Nakano, N.; Osanai, Y.; Owada, M.; Tran Ngoc Nam; Toyoshima, T.; Binh, P.; Tsunogae, T.; Kagami, H.
Author Affiliations:Primary:
Kyushu University, Division Evolution of Earth Environment, Fukuoka, Japan
Yamaguchi University, Japan
Hue University, Vietnam
Niigata University, Japan
Research Institute of Geology and Mineral Resources, Vietnam
University of Tsukuba, Japan
Volume Title:Gondwana Research
Source:Gondwana Research, 12(4), p.438-453. Publisher: Elsevier on behalf of International Association for Gondwana Research, Amsterdam and Kochi, International. ISSN: 1342-937X
Publication Date:2007
Note:In English. 74 refs.; illus., incl. 1 plate, 6 tables, geol. sketch map
Summary: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. Abstract Copyright (2007) Elsevier, B.V. [G.L.B.]
Subsections:General; Igneous rocks; Metamorphism: regional, dynamic
Subjects:Absolute age; Basement; Chemical composition; Complexes; Crystal chemistry; Dates; Deformation; Electron probe data; Fabric; Geochemistry; Geologic barometry; Geothermal gradient; Granulites; Heat flow; High-grade metamorphism; Isotope ratios; Isotopes; Major elements; Mesozoic; Metals; Metamorphic rocks; Metamorphism; Mineral composition; Nd-144/Nd-143; Neodymium; Ordovician; P-T conditions; Paleozoic; Petrology; Plate collision; Plate tectonics; Rare earths; Reactivation; Sm/Nd; Stable isotopes; Textures; Trace elements; Triassic; Asia; Far East; Vietnam; Kannak Complex; Kham Duc Complex; Kontum Massif; Ngoc Linh Complex
Coordinates:N140000 N160000 E1090000 E1080000
Abstract Numbers:08M/0220
Record ID:2008035941
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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