Evolution of the Early Permian volcanic-plutonic complex in the western part of the Permian Gobi-Altay Rift (Khar Argalant Mts., SW Mongolia)

Buriánek, David; Hanžl, Pavel; Budil, Petr; Gerdes, Axel

doi:10.3190/jgeosci.116

Cited by 8 publications

(9 citation statements)

References 36 publications

(31 reference statements)

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“…The Late Paleozoic rift-related intrusive and extrusive acid igneous rocks are relatively common in northern China and south-western Mongolia (Wang ZG et al 1993;Litvinovsky et al 2002;Wu et al 2002;Chen and Jahn 2004;Jahn 2004;Chen and Arakawa 2005;Wang Q et al 2007;Buriánek et al 2012;Liu et al 2013;Mao et al 2014). These generally undeformed, anorogenic-type intrusions provide evidence of the final amalgamation of terranes in this part of the CAOB (Jahn 2004; Liu et al 2013;Mao et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Astrophyllite-alkali amphibole rhyolite, an evidence of early Permian A-type alkaline volcanism in the western Mongolian Altai

et al. 2016

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A dyke of alkali rhyolite intrudes the Tsetseg and Zuun Nuruu volcanosedimentary sequence of Ordovician-Silurian age (Hovd Zone, Central Asian Orogenic Belt) at the Botgon bag, Mankhan Soum, Hovd District in Western Mongolia. The rock consists of quartz and K-feldspar phenocrysts set in fine-grained groundmass composed of quartz, K-feldspar, albite, blue alkali amphibole (riebeckite-arfvedsonite containing up to 1.94 wt. % ZrO 2 ), tiny brown radial astrophyllite, annite and accessory zircon, ilmenite, fluorite, monazite, hematite, chevkinite and bastnäsite. Astrophyllite has unusual, highly ferroan composition and occurs as two sharply bound zones of astrophyllite I and II with the average empirical formulae: (K , poor in CaO (0.26-0.37 wt. %), MgO (0.01-0.11 wt. %), and P 2 O 5 (0.01 wt. %). The rock is enriched in Zr, Nb, Ta, Ga, Sn, Y, Rb, Cs, U and Th, depleted in V, Sr, Ba, Sc, and exhibits a pronounced negative Eu anomaly (Eu/Eu* = 0.03-0.05). The conventional whole-rock K-Ar geochronology yielded an age of 299.9 ± 9.1 Ma (1σ), which indicates latest Carboniferous or early Permian extension associated with the A-type alkaline volcanic activity. Received: 29 October, 2015; accepted: 12 January, 2016; handling editor: K. Schulmann This paper is intended to provide new geochemical and geochronological data on the astrophyllite-and alkali amphibole-bearing rhyolite dyke cutting the Lower Paleozoic volcanosedimentary and plutonic sequence in the Hovd Zone in Western Mongolia. Keywords: rhyolite, A-type, astrophyllite, K-Ar geochronology, CAOB

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Section: Introductionmentioning

confidence: 99%

Astrophyllite-alkali amphibole rhyolite, an evidence of early Permian A-type alkaline volcanism in the western Mongolian Altai

et al. 2016

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“…Late Carboniferous to Early Permian bimodal magmatism has commonly been ascribed to a continentalrift setting (Kovalenko VI et al 2004;Yarmolyuk et al 2008;Zhang X et al 2008;Jahn et al 2009;Buriánek et al 2012). This within-plate magmatic activity at the margin of Siberia was related to Late Palaeozoic-Early Mesozoic Central Asian rifting that was manifested in several rifts of different ages (e.g.…”

Section: Geotectonic Implicationsmentioning

confidence: 99%

“…Late Palaeozoic rift-related intrusive and extrusive igneous rocks are relatively common in northern China and Mongolia (Gavrilova et al 1975;Wang ZG et al 1993;Litvinovsky et al 2002;Wu et al 2002;Chen and Jahn 2004;Jahn 2004;Chen and Arakawa 2005;Wang Q et al 2007;Buriánek et al 2012;Liu W et al 2013;Mao et al 2014). These undeformed anorogenic-type intrusions provide evidence of the final amalgamation of terranes in this part of the CAOB (Jahn 2004;Liu W et al 2013;Mao et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Anorogenic Early Permian dykes in the western Mongolian Altai - petrography, geochemistry and K-Ar geochronology

et al. 2019

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A variety of felsic and mafic dykes grouped into swarms intruded the Lower Palaeozoic volcano-sedimentary sequences (flysch) and Late Devonian to Early Carboniferous plutonic rocks in the Hovd and Altai zones of the Central Asian Orogenic Belt (CAOB), western Mongolian Altai. The dykes reach a thickness of 0.5-20 m, length of approximately 50-2,500 m and strike mostly SW-NE or E-W. The felsic rocks chemically correspond to high-K calc-alkaline to alkaline rhyolites. Compositional trends of mafic rocks pass from alkaline-and calc-alkaline basalts to trachyandesite. The bimodal nature of the association and the transitional calc-alkaline to alkaline character of the dykes indicate magma production through partial melting of the mantle and continental crust in an intra-plate (rift) geodynamic setting. The new conventional whole-rock K-Ar dating of mafic and felsic dykes yielded ages ranging from 300 ± 9 to 281 ± 9 Ma (1σ). This indicates anorogenic volcanic activity associated with Late Carboniferous to Early Permian extension coeval with magmatism in the Gobi-Altai Rift and in the adjacent parts of the Chinese Altai. The calculated crystallization pressures of 1-2 kbar and 0.3-0.4 kbar for felsic and mafic rocks, respectively, indicate emplacement at shallow levels.

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“…Granitic massifs related to the Gobi-Altai Rift Zone are predominantly Early Permian (e.g. Shar Oroy Massif dated at 285 ± 1 Ma; Buriánek et al 2012); Zuun-Bogd, Serkh-Uul, Ulaan-Uul and KharUzuur massifs were emplaced from 293 ± 1 to 279 ± 1 Ma (Kozlovsky et al 2015).…”

Section: Geological Settingmentioning

confidence: 99%

“…Kovalenko et al 2006;Buriánek et al 2012). This suggests an intrusion at relative shallow crustal levels; however, its exact mecha- nism and depth of emplacement has not yet been studied.…”

Section: P-t Conditionsmentioning

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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Evolution of the Early Permian volcanic-plutonic complex in the western part of the Permian Gobi-Altay Rift (Khar Argalant Mts., SW Mongolia)

Cited by 8 publications

References 36 publications

Astrophyllite-alkali amphibole rhyolite, an evidence of early Permian A-type alkaline volcanism in the western Mongolian Altai

Astrophyllite-alkali amphibole rhyolite, an evidence of early Permian A-type alkaline volcanism in the western Mongolian Altai

Anorogenic Early Permian dykes in the western Mongolian Altai - petrography, geochemistry and K-Ar geochronology

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

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