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

Nakano, Nobuhiko; Osanai, Yasuhito; Owada, Masaaki; Nam, Tran Ngoc; Toyoshima, Tsuyoshi; Binh, Pham; Tsunogae, Toshiaki; Kagami, Hiroo

doi:10.1016/j.gr.2007.01.003

Cited by 75 publications

(71 citation statements)

References 43 publications

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“…The gray area indicates P-T conditions obtained from geothermobarometric results for several types of UHT granulites (Osanai et al, 2016a). (c) P-T paths of UHT granulites from the Kontum Massif (after Nakano et al, 2007a). P-T paths for granulite-, eclogite-and amphibolite-facies metamorphic rocks showing similar metamorphic ages to UHT granulites in Vietnam are also compiled (Nakano, 2016).…”

Section: °C 1 Gpamentioning

confidence: 99%

Recent progress in lower crustal process:

Osanai

Nakano

Adachi

2017

Jour. Geol. Soc. Japan

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Ultrahigh-temperature (UHT) and ultrahigh-pressure metamorphism indicate extreme metamorphic conditions in regional metamorphic settings. In particular, the metamorphic temperature of UHT metamorphism is the highest limit of crustal metamorphism, exceeding °C and is equivalent to the temperature of basaltic magma. Typical UHT metamorphic rocks have Mg-Al-rich bulk chemical compositions and are easily identified by a characteristic mineral assemblage of sapphirine + quartz garnet, orthopyroxene + sillimanite quartz, or garnet + osumilite + quartz. Precise reconstruction of the metamorphic evolution of UHT metamorphic rocks on the basis of metamorphic reaction textures, mineral inclusion studies, pressure-temperature estimations, and micro-geochronological analyses is a powerful tool for understanding orogenic processes.

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Section: °C 1 Gpamentioning

confidence: 99%

Recent progress in lower crustal process:

Osanai

Nakano

Adachi

2017

Jour. Geol. Soc. Japan

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“…The Kham Duc Complex is composed of low-to mediumtemperature and relatively high-pressure kyanite-bearing metamorphic rocks (Nakano et al, 2007a(Nakano et al, , 2007b, whereas the Ngoc Linh and Kannak Complexes contain hightemperature (HT) to UHT granulite that reached peak metamorphic P-T conditions of 1.2 GPa and 1050°C Osanai et al, 2004Osanai et al, , 2008. Some of the UHT mafic granulites from the Ngoc Linh Complex record petrological evidence of an earlier eclogite-facies metamorphism , and low-grade metamorphic rocks that may belong to the Kham Duc Complex are exposed in the southern part of the Kannak Complex (Fig.…”

Section: General Geology Of the Kontum Massifmentioning

confidence: 99%

“…1). Parts of these complexes are suggested to have experienced extreme metamorphism in a deep-crustal environment due to continental collision Nakano et al, 2004Nakano et al, , 2007aNakano et al, , 2007bOsanai et al, 2008). Intrusive igneous rocks exposed in the Kannak Complex occur as stocks and lenses within granulite-facies metamorphic lithologies.…”

Section: General Geology Of the Kontum Massifmentioning

confidence: 99%

“…1a and 1b). Both of these metamorphic rock types experienced a similar clockwise P-T evolution during the Late Permian and Early Triassic periods (270-240 Ma: Osanai et al, 2004;Nakano et al, 2004Nakano et al, , 2007aNakano et al, , 2007bNakano et al, , 2008Osanai et al, 2008;Nakano et al, 2009Nakano et al, , 2010. This led Osanai et al (2008) to propose the name 'Trans Vietnam Oro-genic Belt' (TVOB) for the region containing metamorphic and igneous rocks of this age ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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

Owada

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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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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“…In contrast, the Kontum massif in the Indochina Terrane consists of granitoids without Sn mineralization and metamorphic rocks (up to granulite facies) with the ages ranging widely from Neoproterozoic to Triassic (e.g., Carter et al, 2001;Nakano et al, 2007). These petrological and geochronological studies were conducted in central Vietnam but the Kontum massif is continuous to southeasternmost Laos (Fig.…”

Section: Introductionmentioning

confidence: 99%

40Ar/39Ar ages of granitoids from the Truong Son fold belt and Kontum massif in Laos

Sanematsu

Murakami

Duangsurigna

et al. 2011

Journal of Mineralogical and Petrological Sciences

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Geochemical and geochronological studies were conducted on granitoids in central -southern Laos. S -type ilmenite -series granitoids associated with Sn mineralization are distributed in the Truong Son fold belt of central Laos. Plateau ages determined by 40 Ar/ 39Ar incremental heating method for biotite and muscovite of the granitoids range from 253 Ma to 247 Ma and from 244 Ma to 199 Ma in the southwest and northeast of the fold belt, respectively. During this period, the fractionated granites in the early stage are related to mineralization of medium -large Sn deposits. The granitoids of the Truong Son fold belt formed in the Indosinian orogeny are contemporaneous with the Late Permian -Early Jurassic Sn -bearing granites in the Southeast Asian Sn Belt. In contrast, I -type magnetite -series granitoids are distributed in the Kontum massif of southeasternmost Laos. Plateau ages for biotite and previously reported mineral ages of the magnetite -series granitoids range widely from 414 Ma to 252 Ma. The Carboniferous -Permian granitoids represents adakitic characteristics and the Permian adakitic granodiorites are associated with Cu ± Au mineralized quartz veins.

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

Cited by 75 publications

References 43 publications

Recent progress in lower crustal process:

Recent progress in lower crustal process:

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

40Ar/39Ar ages of granitoids from the Truong Son fold belt and Kontum massif in Laos

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