Burd Gol Granite Massif as a product of the Late Cambrian post-orogenic magmatism in the SE part of the Lake Zone, Gobi Altay, SW Mongolia

Hrdličková, Kristýna; Gerdes, Axel; Gilíková, Helena; Dash, B.; Hanžl, Pavel

doi:10.3190/jgeosci.081

Cited by 7 publications

(10 citation statements)

References 15 publications

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“…While ages of c. 430-440 Ma are not known from the Tseel and adjacent terranes (Tab. 1), ages of c. 510-530 Ma correspond well with those of magmatic rocks in the Lake Zone (e. g. Dijkstra et al 2006;Hrdličková et al 2010;Rudnev et al 2012Rudnev et al , 2013Jian et al 2014). Moreover, the age of ~740 Ma resembles that known from coarse-grained orthogneiss of the Zamtyn Nuruu range, also in the Lake Zone (Demoux et al 2009b;Hanžl et al 2014) Therefore, the lower-middle crust underlying the studied region seems to have an affinity to the Neoproterozoic rocks of the Lake Zone.…”

Section: Age and Character Of The Protolith To The Orthogneissessupporting

confidence: 55%

Making continental crust: origin of Devonian orthogneisses from SE Mongolian Altai

Hanžl¹,

Schulmann²,

Janoušek³

et al. 2016

Jour. Geosci.

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Orthogneiss and meta-rhyolite bodies from different crustal levels of the Tseel Terrane in the Mongolian Altai were examined using multidisciplinary approach involving structural geology, whole-rock geochemistry and U-Pb zircon geochronology. The orthogneisses form sheet-like bodies parallel with dominant sub-horizontal metamorphic fabric which was heterogeneously verticalized along localized zones of deformation at boundaries of lower and middle crustal domains. Three samples of orthogneisses yielded Late Devonian LA-ICP-MS U-Pb zircon ages of 373 ± 3, 377 ± 5 and 379 ± 2 Ma (2σ), which are interpreted as crystallization ages of felsic magmas. The meta-rhyolite displays poorly constrained, older U-Pb zircon ages of 380 ± 4 and 403 ± 5 Ma, which are also considered as intrusive. Whole-rock geochemistry, including relatively little fractionated REE patterns, as well as radiogenic whole-rock Nd and zircon Hf isotopic signatures point to a rather primitive source of the granitic protoliths. The high-K calc-alkaline chemistry and LILE over HFSE enrichments in the NMORB-normalized spider plots indicate an arc-related origin. Juvenile character of the studied rocks was confirmed by Nd and Hf crustal residence ages that are mostly 0.8-0.9 Ga. The origin of the metaigneous rocks is interpreted in terms of partial melting of Neoproterozoic to Cambrian magmatic arc-derived material, probably dominated by immature psammitic sediments (graywackes). This study brings important arguments that the orthogneisses do not represent an old crystalline basement previously assumed in the Mongolian Altai. A model is proposed suggesting formation of mature and layered continental crust by syn-orogenic melting of youthful volcanosedimentary wedge and emplacement of sub-horizontal syn-orogenic magmatic sheets at all crustal levels during crustal-scale vertical shortening. The vertical shortening was probably connected to lithospheric-scale extensional event associated with massive heat influx and emplacement of juvenile magmas at the bottom of the crust. It is suggested that this mechanism represents potentially a viable model for cratonization of accretionary systems worldwide.

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Section: Age and Character Of The Protolith To The Orthogneissessupporting

confidence: 55%

Making continental crust: origin of Devonian orthogneisses from SE Mongolian Altai

Hanžl¹,

Schulmann²,

Janoušek³

et al. 2016

Jour. Geosci.

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“…1B; Hrdlickova et al, 2010). The Burd Gol granite is believed to be a post -collisional intrusive rock (Hrdlickova et al, 2010). The age of 506 Ma is similar to that of the Leucogranite in the Hanhohiyn region although it cannot be confirmed yet that the Leucogranite originated from the post -collision magmatism.…”

Section: Regional Extension Of the Cambrian Tectonothermal Eventmentioning

confidence: 93%

“…The southern part of the orogenic belt contains the Burd Gol granite, which has an intrusive age of 506 ± 5 Ma ( Fig. 1B; Hrdlickova et al, 2010). The Burd Gol granite is believed to be a post -collisional intrusive rock (Hrdlickova et al, 2010).…”

Section: Regional Extension Of the Cambrian Tectonothermal Eventmentioning

confidence: 99%

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An early Paleozoic tectonothermal event in western Mongolia: Implications for regional extension of the Cambrian orogenic belt

Owada

Osanai

Nakano

et al. 2013

Journal of Mineralogical and Petrological Sciences

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The Central Asian Orogenic Belt consists of various terranes amalgamated in several periods from the Late Precambrian/Early Paleozoic to the Late Mesozoic. Mongolia is situated in the center of this belt. Foliated garnet granite (Grt metagranite) and andalusite -bearing massive leucogranite (Leucogranite) are exposed in the Hanhohiyn region of northwest Mongolia. The results of monazite Th -U -Pb dating of the Grt metagranite and Leucogranite give ages of 508 ± 10 Ma and 496 ± 4 Ma, respectively. Cambrian granite with an age of ~ 500 Ma is also reported from the south -central part of Mongolia. Combined with previously published age data of metamorphic and intrusive rocks, these results show that the Cambrian orogenic belt spans over 800 km, from the northwest to the south -central part of Mongolia.

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“…Based on a concordia intercept age of 950 ± 16 Ma obtained from metabasalts, the Zamtyn Nuruu Formation has been interpreted as a basement block . U/Pb zircon ages of 542 ± 4 Ma (diorite) and 517 ± 7 Ma and 511 ± 5 Ma (granite), and monazite age of 513 ± 5 Ma have also been determined for plutonic rocks of the Zamtyn Nuruu Formation (Hanžl and Aichler, 2007;Hrdličková et al, 2010). The Zamtyn Nuruu Formation is over -thrusted by both the Alag Khadny metamorphic complex and the Maykhan Tsakhir Formation, which themselves are over -thrusted by the Khantaishir Formation .…”

Section: Geologymentioning

confidence: 99%

Metamorphic pressure-temperature evolution of garnet-chloritoid schists from the Lake Zone, SW Mongolia

Javkhlan

Takasu

Dash

et al. 2013

Journal of Mineralogical and Petrological Sciences

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Garnet -chloritoid schists occur in the Chandman district of the Lake Zone, SW Mongolia, which is located within the central part of the Central Asian Orogenic Belt. The Chandman district is composed of Neoproterozoic ophiolites of the Khantaishir Formation, eclogite -bearing orthogneisses and micaschists of the Alag Khadny metamorphic complex, marbles of the Maykhan Tsakhir Formation, and the basement block of the Zamtyn Nuruu Formation. Garnet -chloritoid schists occur as lenses or layers within marbles of the Maykhan Tsakhir Formation, which lie in contact with eclogite bodies. They consist mainly of garnet, chloritoid, phengitic muscovite, chlorite and quartz, with minor amounts of kyanite, rutile, ilmenite, zircon and carbonaceous matter. The texture and mineral chemistry of the garnet -chloritoid schists record prepeak and peak stages of high -pressure intermediate type metamorphism. The pre -peak stage of epidote -amphibolite facies conditions (T = 500 -510 °C and P = 7 -8 kbar) is deduced from cores of garnet containing mineral inclusions of chloritoid, Fe -rich chlorite, phengitic muscovite, and quartz. The peak mineral assemblage of the garnet -chloritoid schists defined by garnet rims containing chloritoid, phengitic muscovite, Mg -rich chlorite, kyanite and quartz as inclusions indicates T = 560 -590 °C and P = 10 -11 kbar, falling in transitional conditions between the epidote -amphibolite and the eclogites facies. The pressure conditions of the garnet -chloritoid schists are distinctly lower than those of the eclogites (T = 590 -610 °C and P = 20 -25 kbar), whereas temperature conditions are similar. The eclogites are considered to have formed by subduction of oceanic crust. In contrast, the metamorphism of the garnet -chloritoid schists was probably related to collisional tectonic event in the Central Asian Orogenic Belt.

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Burd Gol Granite Massif as a product of the Late Cambrian post-orogenic magmatism in the SE part of the Lake Zone, Gobi Altay, SW Mongolia

Cited by 7 publications

References 15 publications

Making continental crust: origin of Devonian orthogneisses from SE Mongolian Altai

Making continental crust: origin of Devonian orthogneisses from SE Mongolian Altai

An early Paleozoic tectonothermal event in western Mongolia: Implications for regional extension of the Cambrian orogenic belt

Metamorphic pressure-temperature evolution of garnet-chloritoid schists from the Lake Zone, SW Mongolia

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