Geology of the Gobi Altai and Tseel terranes in the central part of the Sagsai River Watershed, SE Mongolian Altai

Hanžl, Pavel; Krejčí, Zuzana; Altanbaatar, Battushig; Lexa, Ondrej; Buriánek, David; Janoušek, Vojtěch; Schulmann, Karel; Jiang, Yingde; Hrdličková, Kristýna

doi:10.1080/17445647.2017.1297260

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Methods used to process the input data and compile the final map are described in recent papers (e.g. Abbà et al, 2018;Balestro, Fioraso, & Lombardo, 2013;Carmignani, Conti, Cornamusini, & Pirro, 2013;Hanžl et al, 2017). The topographic base is a national topographic map of Bosnia and Herzegovina at a scale of 1:25,000 made by Military-Geographical survey of former Yugoslavia.…”

Section: Methodsmentioning

confidence: 99%

Geological settings of the Jajce bauxite bearing-area (Bosnia and Herzegovina)

2019

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In the bauxite-bearing area of Jajce (Bosnia & Herzegovina), exploitation of karst bauxite has occurred for more than 40 years, during which time extensive geological and mining research was also conducted. Here, the geological map of the Jajce bauxite bearing-area (Bosnia & Herzegovina) at a scale of 1:25.000 is presented, accompanied by a geological column and regional geological cross-sections. The map shows the main stratigraphic and tectonic features and positions of the bauxite deposits of the area. This research area covers 343 km 2 , divided into two structural units with four bauxite districts, Liskovica, Bešpelj, Crvene Stijene and Poljane. The Liskovica-Bešpelj structural unit is tectonically very complex, characterized by WE trending structures in subvertical, vertical and overturned positions. The Crvene Stijene-Poljane structural unit is characterized by gentle folds and normal faults. The geological map summarizes all the available data and represents the necessary basis for further geological and mining research of the area.

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Section: Methodsmentioning

confidence: 99%

Geological settings of the Jajce bauxite bearing-area (Bosnia and Herzegovina)

2019

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“…Recent lithostratigraphic analysis of Buriánek et al (2022) provided more detailed definition of the whole Palaeozoic sequences of the Mongolian Altai Domain. The earliest Tugrug Group (Jiang et al 2017;Hanžl et al 2020) (flysch-like) sediments containing subalkaline volcanic rocks showing basalt-basaltic andesite and dacite-rhyolite compositional trends (Hanžl et al 2017). The Tugrug Group includes Tugrug s.s. and Ukhinuur formations described by Markova (1975) and Rauzer et al (1987) in the Gobi Altai Zone and Baatar and Zuunnuruu formations in the Khovd Zone (Buriánek et al 2022).…”

Section: Volcano-sedimentary Sequences Of the Mongolian Altai Domainmentioning

confidence: 99%

Late Ordovician magmatic pulse in the Tugrug Group, the Gobi Altai Zone, SW Mongolia

Hanžl,

Uhrová,

Hrdličková

et al. 2024

J. Geosci.

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district, 19 th khoroo, 3 rd building, Ulaanbaatar * Corresponding authorThe Mongolian Altai Domain of the Central Asian Orogenic Belt is formed by a giant Lower Palaeozoic accretionary wedge that was later thrust over the northerly Central Mongolian Microcontinent. This accretionary complex mainly consists of late Cambrian-Ordovician volcano-sedimentary rocks represented by various formations within the Tugrug Group which were deformed, metamorphosed and intruded by numerous plutons during the Devonian-Carboniferous orogenic events. In this work, we report new U-Pb zircon ages of two felsic igneous rocks indicating an existence of the so far neglected late Ordovician magmatic event affecting the Mongolian Altai accretionary wedge. The felsic volcanic sheet inside the upper part of the Tugrug Group in the western Gobi Altai Zone (eastern part of the Mongolian Altai Domain) yields an age of 457 ± 2 Ma and nearby granite pluton intruding the entire volcano-sedimentary sequence gives an age of 445 ± 1 Ma. Both rocks are high-K calc-alkaline, peraluminous, with similar geochemical patterns characterised by enrichment in mobile lithophile elements over Nb, Ti, P and Sr and nearly identical REE trends. All together, these features point to an analogous volcanic-arc-related magma source. This magmatism reflecting terminal stages of the accretionary wedge formation in the Mongolian Altai Domain may be related to the recently proposed late Ordovician orogenic event.

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“…1) The northern super-unit includes Precambrian basement in Tuva-Mongolia, Zavkhan and Baidrag blocks, as well as Neoproterozoic to Lower Palaeozoic accretionary wedge and ophiolites of the Lake Zone; 2) The southern generally Palaeozoic super-unit was subdivided by Kröner et al (2010) from north to south to (a) the Mongol Altai and Gobi Altai zones, (b) the Trans-Altai Zone, and (c) the Gobi Tien Shan Zone. The Mongol Altai and Gobi Altai zones consist of accreted Lower Palaeozoic back-arc/fore-arc basins, island arcs, granite-migmatite complexes and turbidite sequences (Burenjargal et al 2014;Hanžl et al 2017;Jiang et al 2017;Lehmann et al 2017;Buriánek et al 2022). The Devonian-Carboniferous volcanic rocks and turbidites in the Trans-Altai Zone are imbricated with Early Palaeozoic ophiolites and oceanic sediments (Ruzhentsev and Pospelov 1992;Helo et al 2006;Edel et al 2018).…”

Section: General Regional Subdivisionmentioning

confidence: 99%

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

Hanžl¹,

Janoušek²,

Hrdličková³

et al. 2023

J. Geosci.

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The Trans-Altai Zone in the southern tract of the Central Asian Oceanic Belt is composed of Early Palaeozoic oceanic crust preserved in Ordovician to Devonian ophiolite fragments and Devonian-Carboniferous igneous arcs. The Edren and Baaran subzones at the NW tip of the Trans-Altai Zone were intruded by Late Palaeozoic plutons that have been examined by the combined geochronological and geochemical study. Mississippian subduction-related plutons intruded Devonian and Carboniferous volcano-sedimentary sequences in two magmatic pulses. The older, Tournaisian plutons (dated at 352 ± 1 and 347 ± 4 Ma) occur in both subzones; the younger Visean/Serpukhovian ones (331 ± 1 Ma) are found only at the northern boundary of the Edren Subzone. All Mississippian rocks are high-K calc-alkaline and characterised by a strong enrichment of hydrous fluid mobile lithophile elements over conservative Nb, Ta and Ti relative to normal mid-ocean ridge basalts. Low 87 Sr/ 86 Sr i (~ 0.7035-0.7038) and highly positive ε i Nd values (+ 6.6 to + 5.2) suggest a relatively juvenile parental magma source with a short mean crustal residence. This corresponds well with the age of scarce inherited zircons, none of which is older than 530 Ma. The Early Permian post-tectonic plutons intruded the shallow crust of the Baaran Subzone (Devonian-Carboniferous flysch and Early Carboniferous volcanic arc). The prominent concentric body of the Aaj Bogd Pluton is composed of monzodiorites to monzogabbros (284 ± 1 and 294 ± 3 Ma) in its centre, surrounded by granite with syenite (282 ± 1 Ma) in the main mass of the pluton. Whole-rock Sr-Nd isotopic ratios match those of Carboniferous magmatic rocks, while trace-element patterns point to an intra-plate origin influenced by a fertile asthenospheric mantle component. On the other hand, the slightly older (290 ± 1 Ma) quartz syenites to alkali feldspar granites in the Baaran Subzone have spurious arc-like geochemistry inherited from their arc-related crustal source(s). Regional distribution of the numerous oval-shaped Early Permian alkaline post-orogenic plutons, some with A 2 -type granite affinity, follows the major Permian strike-slip zones spanning from the Dulate Arc in the west to the Khan Bogd Pluton in the east. These late, transcurrent zones apparently played an important role in late-orogenic magma generation, ascent and emplacement.

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Geology of the Gobi Altai and Tseel terranes in the central part of the Sagsai River Watershed, SE Mongolian Altai

Cited by 5 publications

References 16 publications

Geological settings of the Jajce bauxite bearing-area (Bosnia and Herzegovina)

Geological settings of the Jajce bauxite bearing-area (Bosnia and Herzegovina)

Late Ordovician magmatic pulse in the Tugrug Group, the Gobi Altai Zone, SW Mongolia

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

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