The Ureg Nuur Pt-bearing volcanoplutonic picrite–basalt association in the Mongolian Altay as evidence for a Cambrian–Ordovician Large Igneous Province

Изох, А. Э.; Вишневский, А. В.; Polyakov, G. V.; Kalugin, V. M.; Oyunchimeg, Ts.; Shelepaev, R.A.; Egorova, V. V.

doi:10.1016/j.rgg.2010.04.003

Cited by 24 publications

(11 citation statements)

References 22 publications

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“…Locations of geochronological age in the Lake and Mongolian Altay. Numbers of each box refer to data from (1) Kovalenko et al, , (2) Gibsher et al, , (3) Jian et al, , (4) Khain et al, , (5) Pfänder et al, , (6) Dijkstra et al, , (7) Izokh et al, , , (8) Lehmann et al, , (9) Stipska et al, 2010, (10) Mongush, Lebedev, Travin, & Yarmolyuk, , (11) Hrdličková et al, , (12) Yarmolyuk et al, , (13) Rudnev et al, , ; Rudnev, Kovach, & Ponomarchuk, , (14) Buriánek et al, , and (15) Jiang et al, [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: The Geology Of the Lake And Mongolian Altay Zonesmentioning

confidence: 99%

“…Its U–Pb SHRIMP age was determined to be 511 ± 12 Ma (Izokh, Polyakov, Vishnevsky, Shelepaev, & Oyunchimeg, ). In the Tsagaan‐Shuvuut zone to the northwest, picrite, picrobasalt, and picrodolerite have yielded ages of 512 ± 6 Ma age (Izokh et al, ). In the southeast part of the Lake zone, there are small outcrops of high‐pressure eclogite rocks in the Zamtyn Nuruu mountains (Štípská et al, ).…”

Section: Is the Lake Zone With Ops A Remnant Part From The Paleo‐asiamentioning

confidence: 99%

“…Together with ophiolites, the Bayrim and Turgen zone metamorphic complexes are composed of greenschists with thin layers of marble and quartzite in their lower parts and, in upper parts, of terrigenous flysch with sills, flood basalts (Tomurtogoo, 2014) and intrusions of picrite, picrobasalt, and picrodolerite of 512 Ma age (Izokh et al, 2010;Izokh, Vishnevsky, Polyakov, & Shelepaev, 2011).…”

Section: The Geology Of the Lake And Mongolian Altay Zonesmentioning

confidence: 99%

“…, 571 ± 4 Ma (Khain et al, 2003), and 573 Ma (Jian et al, 2014), respectively, and have F I G U R E 3 Locations of geochronological age in the Lake and Mongolian Altay. Numbers of each box refer to data from (1) Kovalenko et al, 1996, (2) Gibsher et al, 2001, (3) Jian et al, 2014, (4) Khain et al, 2003, (5) Pfänder et al, 2002, (6) Dijkstra et al, 2006, (7)Izokh et al, 2010Izokh et al, , 2011 Lehmann et al, 2010, (9) Stipska et al, 2010 Mongush, Lebedev, Travin, & Yarmolyuk, 2011, (11) Hrdličková et al, 2008 …”

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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 Geology Of the Lake And Mongolian Altay Zonesmentioning

confidence: 99%

Section: Is the Lake Zone With Ops A Remnant Part From The Paleo‐asiamentioning

confidence: 99%

Section: The Geology Of the Lake And Mongolian Altay Zonesmentioning

confidence: 99%

mentioning

confidence: 99%

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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 Altai orogen is located in the western CAOB, which is the world largest accretionary orogen and has been expensively studied during the last 20 years (e.g., Zonenshain et al, 1990;Buslov et al, 2001;Kröner et al, 2007Kröner et al, , 2014Kovalenko et al, 2004;Xiao et al, 2003Xiao et al, , 2010Windley et al, 2007;Polyakov et al, 2008;Izokh et al, 2010Izokh et al, , 2011Safonova et al, 2011;Yarmolyuk et al, 2012). It is situated between the Gorny Altai in Russia to the north and the Western Junggar to the south (Fig.…”

Section: Geological Backgroundmentioning

confidence: 99%