Late Paleozoic anorogenic magmatism of the Gobi Altai (SW Mongolia): Tectonic position, geochronology and correlation with igneous activity of the Central Asian Orogenic Belt

Kozlovsky, A. M.; Yarmolyuk, V. V.; Сальникова, Е. Б.; Травин, А. В.; Kotov, A. B.; Plotkina, J. V.; Kudryashova, E. A.; Саватенков, В. М.

doi:10.1016/j.jseaes.2015.01.013

Cited by 36 publications

(20 citation statements)

References 100 publications

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“…Plutonic rocks in the area formed in three main stages associated with early Palaeozoic (E–O), middle Palaeozoic (D–C1), and Permian–Triassic (P–T) tectonomagmatic events (Buriánek et al, ; Cai et al, ; Gavrilova, ; Kovalenko et al, , ; Kozlovsky et al, ; Pavlova et al, ; Soejono et al, ).…”

Section: The Early Palaeozoic Mega‐thrusting Of the Altay–lake Zonementioning

confidence: 99%

The Early Palaeozoic mega‐thrusting of the Gondwana‐derived Altay–Lake zone in western Mongolia: Implications for the development of the Central Asian Orogenic Belt and Paleo‐Asian Ocean evolution

Khukhuudei

Kusky

Otgonbayar³

et al. 2020

Geological Journal

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The position of structures of Mongolia during Rodinia break‐up and Paleo‐Asian Ocean opening is debatable, and reconstructions between them are poorly known. In this paper, we apply an integrated approach to the not widely known yet distinctive structure (ribbon‐like) of the Lake and Mongolian Altay zones in western Mongolia, relating these with the surrounding Tuva–Mongolian and central Mongolian microcontinents (CMMs) development within the Central Asian Orogenic Belt (CAOB) and Paleo‐Asian Ocean evolution. We present a summary of the Neoproterozoic–early Palaeozoic tectonic development of western Mongolia and the CAOB and suggest a new comprehensive model for its evolution. The Lake zone of Mongolia is a major zone of ophiolite and arc complexes within the CAOB. The main sections of ophiolites are located along the west margin, bordering with Precambrian crystalline basement of the CMM. The ophiolites are distributed from north to south and have been dated to have similar ages. A classic oceanic plate stratigraphy section is preserved in the Lake zone. Serpentinite mélange and other volcanogenic‐terrigenous assemblages from the Lake zone are characterized by a system of nappe sheets thrust over the Dzavkhan block of the CMM. The ribbon‐like structure that the southern part of the Altay–Lake zone preserves at present provides an explanation for the development between the Gondwana‐derived microcontinent and Paleo‐Asian Ocean. During the pre‐Neoproterozoic, convergence accretion between Siberia and the CMM formed the Tuva–Mongolian belt, which later converted to the Altay–Lake collision zone associated with the thrusting of its eastern margin. All well‐known ophiolites of western Mongolia (Agardag, Khantayshir, and Dariv) as well as ophiolites of the Erdene Uul area mostly correspond to an “open‐ocean” phase with drifting microcontinents between 655 and 540 Ma or Neoproterozoic. In the early Neoproterozoic, the Altay peninsula‐like ribbon microcontinent after rifting of East Gondwana gradually drifted to Siberia. In this time, the east margin of the Paleo‐Asian Ocean was developed as a passive margin with the Dzavkhan Block. The Paleo‐Asian ocean plate simultaneously drifted to the CMM, whereas the Altay microcontinent moved into Siberia‐CMM. In middle‐upper Neoproterozoic times, the eastern part of the Paleo‐Asian ocean plate was thrusted over the CMM, obducting ophiolites (e.g., Tas Khairkhan), in the early Cambrian time, an oceanic spreading centre (?) of the Paleo‐Asian Ocean reached the CMM and stopped obduction. In the Neoproterozoic, the west margin of the Paleo‐Asian Ocean was developed as an active continental margin, with subduction under the Gondwana‐derived microcontinent. In the early Cambrian, there was significant subduction rollback and accretion of seamounts (Turgen). Later, in middle Cambrian–early Ordovician times, a large turbidite sequence was deposited in Altay. During the Devonian to Carboniferous, the Paleo‐Asian Ocean was preserved as a remnant ocean or big sea (Lake zone), accumulating ...

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Section: The Early Palaeozoic Mega‐thrusting Of the Altay–lake Zonementioning

confidence: 99%

The Early Palaeozoic mega‐thrusting of the Gondwana‐derived Altay–Lake zone in western Mongolia: Implications for the development of the Central Asian Orogenic Belt and Paleo‐Asian Ocean evolution

Khukhuudei

Kusky

Otgonbayar³

et al. 2020

Geological Journal

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“…Mainly relatively short interval between final closure of the basins of the Palaeo-Asian Ocean (latest arc-type magmatic rocks in the Gobi Altai area were emplaced at c. 332 Ma, Kozlovsky et al 2015) demonstrates the suitability of a slab break-off model (Davies and von Blanckenburg 1995) for genesis of the Sagsai Pluton (initial stage of magmatism dated at 322 ± 2 Ma).…”

Section: Geodynamic Contextmentioning

confidence: 93%

“…1a). The alkaline granite massifs in the SW Mongolia coincide with Gobi-Altai, Main Mongolian Lineament and the Gobi-Tien Shan rift zones which are spatially related with major tectonic boundaries between Precambrian blocks (Kozlovsky et al 2015). The formation of the Main Mongolian Lineament and the Gobi-Tien Shan rift zones corresponded to early evolution of this rift system (Kuzmin et al 2011).…”

Section: Introductionmentioning

confidence: 92%

“…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%

“…Predominant, slightly peraluminous calc-alkaline granites with migmatite xenoliths are products of partial melting of psammitic rocks or orthogneisses. Kozlovsky et al (2015) advocated two models for the formation of Palaeozoic alkaline massifs in the SW Mongolia: (1) influence of the Tarim mantle plume on the lithosphere of the Central Asian Orogenic Belt or (2) slab break-off after blocking the subduction as a consequence of terrane accretion. The magmas generated in both cases would have similar geochemical signatures.…”

Section: Valuesmentioning

confidence: 99%

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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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Late Paleozoic to early Triassic multiple roll-back and oroclinal bending of the Mongolia collage in Central Asia

Xiao

Windley

Han

et al. 2018

Earth-Science Reviews

424

281

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Late Paleozoic anorogenic magmatism of the Gobi Altai (SW Mongolia): Tectonic position, geochronology and correlation with igneous activity of the Central Asian Orogenic Belt

Cited by 36 publications

References 100 publications

The Early Palaeozoic mega‐thrusting of the Gondwana‐derived Altay–Lake zone in western Mongolia: Implications for the development of the Central Asian Orogenic Belt and Paleo‐Asian Ocean evolution

The Early Palaeozoic mega‐thrusting of the Gondwana‐derived Altay–Lake zone in western Mongolia: Implications for the development of the Central Asian Orogenic Belt and Paleo‐Asian Ocean evolution

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

Late Paleozoic to early Triassic multiple roll-back and oroclinal bending of the Mongolia collage in Central Asia

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