Geology and geochemistry of the Palaeozoic plutonic bodies of the Trans-Altay Gobi, SW Mongolia: implications for magmatic processes in an accreted volcanic-arc system

Hanžl, Pavel; Dash, B.; Rejchrt, Miroslav; Košler, Jan; Bolormaa, Khasbar; Hrdličková, Kristýna

doi:10.3190/jgeosci.028

Cited by 10 publications

(22 citation statements)

References 21 publications

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“…Bivariate diagrams of trace and rare earth element ratios of sample from the Badain Jaran Desert and the red sand dune field, and compared to their potential source areas. AM field is potential source areas of Altay Mountains and Mongolia Gobi (data from Economos et al, 2008;Hanzl et al, 2008;Zhang et al, 2013); Q field is potential source areas of Qilian Mountains (data from Wan et al, 2006;Yan et al, 2010;Huang et al, 2014). Keys same as for Fig.…”

Section: Implication For Tracing Provenance Of Loess Sedimentsmentioning

confidence: 97%

“…Secondly, runoff volume of the Heihe River drainage is much greater than the ephemeral channels or past perennial (Taylor and McLennan, 1985;Fedo et al, 1995). In (b), the data of granite and granitoid in solid black triangle and star are from Qilian Mountains (Wan et al, 2006;Yan et al, 2010;Huang et al, 2014) and Altay Mountains and Mongolia Gobi (Economos et al, 2008;Hanzl et al, 2008;Zhang et al, 2013), respectively (Data of the potential source rocks are the average values of several samples with large spatial coverage.). Keys same as for Fig.…”

Section: Provenances Of Aeolian Sandsmentioning

confidence: 97%

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Geochemical and geomorphological evidence for the provenance of aeolian deposits in the Badain Jaran Desert, northwestern China

Yang

2016

Quaternary Science Reviews

128

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Section: Implication For Tracing Provenance Of Loess Sedimentsmentioning

confidence: 97%

Section: Provenances Of Aeolian Sandsmentioning

confidence: 97%

Geochemical and geomorphological evidence for the provenance of aeolian deposits in the Badain Jaran Desert, northwestern China

Yang

2016

Quaternary Science Reviews

128

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“…4C) with a wide compositional range (Hanzl et al, 2008a). Mutually intrusive fi eld relationships indicate that the dikes interacted with still-partially-molten magmas in the central Gobi-Tianshan intrusive complex (Fig.…”

Section: Geology Of the Gobi-tianshan Intrusive Complexmentioning

confidence: 99%

“…The study area, the Gobi-Tianshan intrusive complex (also called Zamyn Belgekh pluton by Hanzl et al, 2008a), is a Permian igneous complex located in the southwestern corner of Mongolia, along strike to the east of Tianshan tectono-magmatic belts (Fig. 2).…”

Section: Regional Geologymentioning

confidence: 99%

Gobi-Tianshan connections: Field observations and isotopes from an early Permian arc complex in southern Mongolia

Economos

Paterson

Said

et al. 2012

Geological Society of America Bulletin

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The Tianshan orogen, in the southern Central Asian orogenic belt, consists of continental fragments stitched together during mid-to late Paleozoic arc magmatism generated by the closure of the paleo-Asian Ocean. Controversy persists regarding the timing of fi nal structural amalgamation of the region and therefore whether Permian magmatism was generated in a subduction or intraplate environment. Based on new fi eld mapping, zircon U-Pb geochronology, and isotope data from the 295-290 Ma Gobi-Tianshan intrusive complex in southwestern Mongolia, we argue that this complex is a voluminous intermediate batholith generated by subduction and that it is related to plutons of similar age and character in Tianshan tectono-magmatic belts to the west. In the study area, as well as in Carboniferous and Permian plutons across the Tianshan, mantle isotopic signatures remain consistently primitive. Permian plutons show an increase in radiogenic Sr with no concurrent decrease in radiogenic Nd, which may be due to the infl uence of subducting continental sediment in the early Permian. This model explains the transitional nature of magmatic compositions and structures in the Gobi-Tianshan intrusive complex.

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“…Sandimirova et al 1980;Vladykin et al 1981; Kovalenko et al 2006). Alkaline signatures were described in the Permian post-tectonic plutons along the Trans-Altai shear zones and some such magmatic rocks form the Gobi-Tien Shan Batholith (Hanžl et al 2008) and Tsagaan Bogd Massif (Kozlovsky et al 2012). Granitic massifs related to the Gobi-Altai Rift Zone are predominantly Early Permian (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

Petrogenesis of the Late Carboniferous Sagsai Pluton in the SE Mongolian Altai

Buriánek¹,

Janoušek²,

Hanžl³

et al. 2016

J. Geosci.

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Sagsai Pluton intruded the low-grade metavolcanosedimentary complex of the Cambrian Tugrug Fm. in the Sagsai river valley SW of Tsogt soum, Gobi-Altai aimag (SE Mongolian Altai). This oval body (~9 × 12 km) is composed mainly of amphibole monzogabbros to quartz diorites, biotite to amphibole-biotite syenites to quartz monzonites. It is intruded by anatectic two-mica granites along the W rim. The abundant mafic microgranular enclaves enclosed by syenites to quartz monzonites are interpreted as an evidence of vigorous magma mingling and mixing. The newly obtained LA ICP-MS zircon ages for two samples of quartz monzonites gave emplacement ages of 307 ± 1 Ma and 309 ± 2 Ma (2σ), respectively. The zircons highly have ε t Hf values varying broadly from +2.4 to +11.6 ruling out a participation of an old, mature crust. One gabbro body gave zircon U-Pb age of 322 ± 2 Ma with positive ε t Hf values of +7.4 to +11.5. The latter suggest an exclusively juvenile, depleted mantle-derived magma source. According to calculated P-T conditions, we propose three main stages in the Sagsai Pluton evolution. The gabbro started to grow at >1000 °C and 0.8-0.9 GPa. The ensuing magma mixing with crustal melts and final crystallization of gabbro occurred at similar P-T conditions (740-830 °C and 0.5-0.6 GPa) as partial melting of migmatite xenoliths in the Sagsai Pluton. The P-T conditions of the Sagsai Pluton final emplacement calculated from quartz syenite (c. 600 to 670 °C and 0.4-0.5 GPa) are consistent with the mineral assemblage in the contact aureole (cordierite-biotite and biotite-chlorite schists). The magmatic evolution of Sagsai Pluton confirms a model of deep lithosphere thermal anomaly associated with heterogeneous melting of crust in a post-subduction extensional regime, perhaps shortly after the slab break-off.

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Geology and geochemistry of the Palaeozoic plutonic bodies of the Trans-Altay Gobi, SW Mongolia: implications for magmatic processes in an accreted volcanic-arc system

Cited by 10 publications

References 21 publications

Geochemical and geomorphological evidence for the provenance of aeolian deposits in the Badain Jaran Desert, northwestern China

Geochemical and geomorphological evidence for the provenance of aeolian deposits in the Badain Jaran Desert, northwestern China

Gobi-Tianshan connections: Field observations and isotopes from an early Permian arc complex in southern Mongolia

Petrogenesis of the Late Carboniferous Sagsai Pluton in the SE Mongolian Altai

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