Metamorphic P–T evolution of garnet–kyanite–staurolite schist and garnet amphibolite from Bodonch area, western Mongolian Altai: Geothermobarometry and mineral equilibrium modeling

Zorigtkhuu, Oyun-Erdene; Tsunogae, Toshiaki; Dash, B.

doi:10.1016/j.jseaes.2011.04.026

Cited by 15 publications

(12 citation statements)

References 38 publications

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“…We studied the Tseel area in the eastern part of this terrane. The terrane records widespread greenschist to amphibolite facies metamorphism (Sukhorukov, 2007;Zorigtkhuu et al, 2011), and a migmatized granulite-facies mafic gneiss (Cpx + Pl + Hbl + Opx + Bt) has been reported from the Tsogt area, approximately 50 km east of Tseel. The granulite-and amphibolite-facies metamorphism has been dated at 360-390 Ma, and retrograde metamorphism at 350-360 Ma, related to intrusions of granitoids and gabbro, although some of the granitoids have been dated at 240-270 Ma (e.g., Kozakov et al, 2007 and references therein).…”

Section: Geological Settingmentioning

confidence: 99%

“…Previous studies estimated the P-T conditions by geothermobarometers for several samples from the limited areas (Kozakov et al, 2002;Sukhorukov, 2007;Zorigtkhuu et al, 2011); however, the entire P-T paths of the Tseel metamorphic rocks and their special variation have not been constrained. One of the important constraints on the metamorphic P-T history of the Tseel terrane is recorded in aluminosilicate-bearing quartz veins, because these veins contain the assemblage of kyanite (Ky)-sillimanite (Sil)-andalusite (And) (Sukhorukov, 2007).…”

Section: Introductionmentioning

confidence: 99%

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An exhumation pressure–temperature path and fluid activities during metamorphism in the Tseel terrane, SW Mongolia: Constraints from aluminosilicate-bearing quartz veins and garnet zonings in metapelites

Ulziiburen

Okamoto

Meguro

et al. 2012

Journal of Asian Earth Sciences

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An exhumation pressure–temperature path and fluid activities during metamorphism in the Tseel terrane, SW Mongolia: Constraints from aluminosilicate-bearing quartz veins and garnet zonings in metapelites

Ulziiburen

Okamoto

Meguro

et al. 2012

Journal of Asian Earth Sciences

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“…The examined quartz is a matrix medium -grained phase and occurs together with biotite. The calculated P -T condition of the assemblage is 635 -685 °C and 6.3 -7.3 kbar (Zorigtkhuu et al, 2011).…”

Section: Petrographymentioning

confidence: 96%

“…We therefore regard that primary fluid inclusions trapped in quartz probably preserve fluids around peak metamorphism. Zorigtkhuu et al (2011) estimated metamorphic conditions of 655 -695 °C and 7.8 -10.6 kbar using mineral equilibrium modeling technique for the assemblage.…”

Section: Petrographymentioning

confidence: 99%

“…The garnet -biotite -sillimanite schist (sample 24 -8) is composed of idioblastic to subidioblastic garnet (Alm 76−78 Prp 16−18 Grs 3−4 Sps 2−3 ) with biotite (X Mg = 0.55), fi- Kozakov et al, 2002 (Zorigtkhuu et al, 2011). The matrix quartz, which contains primary fluid inclusions, is texturally in equilibrium with biotite, suggesting that the quartz might have formed during high -grade metamorphism at T >650 °C.…”

Section: Petrographymentioning

confidence: 99%

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Carbonic fluid inclusions in amphibolite-facies pelitic schists from Bodonch area, western Mongolian Altai

Zorigtkhuu

Tsunogae

Dash

2012

Journal of Mineralogical and Petrological Sciences

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We report first fluid inclusion data on amphibolite -facies pelitic schists from Bodonch area of western Mongolian Altai in the Central Asian Orogenic Belt. Three categories of fluid inclusions have been observed in quartz: dominant primary and secondary inclusions, and least dominant pseudosecondary inclusions. The melting temperatures of all the categories of inclusions lie in the narrow range of −57.5 °C to −56.6 °C, close to the triple point of pure CO 2 . Homogenization of fluids occurs into liquid phase at temperature between −33.3 °C to +19.4 °C, which convert into densities in the range of 0.78 g/cm 3 to 1.09 g/cm 3. The estimated CO 2 isochores for primary and pseudosecondary high -density inclusions is broadly consistent with the peak metamorphic condition of the studied area (6.3 -7.3 kbar at 655 °C). The results of this study, together with the primary and pseudosecondary nature of the inclusions, indicate CO 2 was the dominant fluid component during the peak amphibolitefacies metamorphism of the study area. The examined quartz grains are texturally associated with biotite, kyanite and staurolite, which are regarded as high -grade minerals formed during prograde to peak metamorphism. Therefore quartz probably formed by high -grade metamorphism and the primary fluid inclusions trapped in the minerals probably preserve fluids at around peak metamorphism.

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Anatexis of accretionary wedge, Pacific-type magmatism, and formation of vertically stratified continental crust in the Altai Orogenic Belt

et al. 2016

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Granitoid magmatism and its role in differentiation and stabilization of the Paleozoic accretionary wedge in the Chinese Altai are evaluated in this study. Voluminous Silurian‐Devonian granitoids intruded a greywacke‐dominated Ordovician sedimentary succession (the Habahe Group) of the accretionary wedge. The close temporal and spatial relationship between the regional anatexis and the formation of granitoids, as well as their geochemical similarities including rather unevolved Nd isotopic signatures and the strong enrichment of large‐ion lithophile elements relative to many of the high field strength elements, may indicate that the granitoids are product of partial melting of the accretionary wedge rocks. Whole‐rock geochemistry and pseudosection modeling show that regional anatexis of fertile sediments could have produced a large amount of melts compositionally similar to the granitoids. Such process could have left a high‐density garnet‐ and/or garnet‐pyroxene granulite residue in the deep crust, which can be the major reason for the gravity high over the Chinese Altai. Our results show that melting and crustal differentiation can transform accretionary wedge sediments into vertically stratified and stable continental crust. This may be a key mechanism contributing to the peripheral continental growth worldwide.

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Metamorphic P–T evolution of garnet–kyanite–staurolite schist and garnet amphibolite from Bodonch area, western Mongolian Altai: Geothermobarometry and mineral equilibrium modeling

Cited by 15 publications

References 38 publications

An exhumation pressure–temperature path and fluid activities during metamorphism in the Tseel terrane, SW Mongolia: Constraints from aluminosilicate-bearing quartz veins and garnet zonings in metapelites

An exhumation pressure–temperature path and fluid activities during metamorphism in the Tseel terrane, SW Mongolia: Constraints from aluminosilicate-bearing quartz veins and garnet zonings in metapelites

Carbonic fluid inclusions in amphibolite-facies pelitic schists from Bodonch area, western Mongolian Altai

Anatexis of accretionary wedge, Pacific-type magmatism, and formation of vertically stratified continental crust in the Altai Orogenic Belt

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