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

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doi: 10.1016/j.gr.2007.01.003
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
Other:
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.]
Sections:Petrology
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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