Crystalline complexes of the Tarbagatai block of the Early Caledonian superterrane of Central Asia

Козаков, И. К.; Kozlovsky, A. M.; Yarmolyuk, V. V.; Ковач, В. П.; Bibikova, Elena; Kirnozova, T. I.; Plotkina, Yu. V.; Zagornaya, N. Yu.; Fugzan, M. M.; Erdenejargal, Ch.; Лебедев, В. И.; Eenjin, G.

doi:10.1134/s0869591111040047

Cited by 52 publications

(30 citation statements)

References 17 publications

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“…At almost the same time as in the Dzabkhan Man dal zone the Late Riphean orogeny took place in the northern and northwestern framing of the Tarbagatai block and directly north of the Dzabkhan Mandal zone within the Bayannur zone of the Songino block (Kozakov et al, , 2011Yarmolyuk et al, 2009). The episodes of amphibolite metamorphism of rocks of the Riphean Jargalant complex of Tarbagatai block were dated as about 0.80 and 0.81 Ga.…”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 93%

“…It is quite obvious that the age and isotope charac teristics of rocks in the Dzabkhan Mandal zone signif icantly differ from that of the Early Precambrian crys talline rocks of the Baidarik block (T Nd (DM) = 3.3⎯2.9 Ga) and Ider complex of the Tarbagatai block (T Nd (DM) = 3.0⎯2.9 Ga) (Kozakov et al, 1997(Kozakov et al, , 2007(Kozakov et al, , 2011 (Fig. 5).…”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 95%

“…The episodes of amphibolite metamorphism of rocks of the Riphean Jargalant complex of Tarbagatai block were dated as about 0.80 and 0.81 Ga. The Nd isotope characteristics of the Jargalant rocks (ε Nd = -5.0… ⎯4.0, T Nd (DM) = 1.9⎯1.3 Ga; Kozakov et al, 2011) therefore differ from those of the Dzabkhan Mandal zone (Fig. 5).…”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 98%

“…In the modern structure of Central Asia the Baid arik block of DM is separated by the Bayan Khongor (2) synmetamorphic granitoids of Dzabkhan Mandal zone; (3) crystalline rocks of Jargalant complex of Tarbagatai block (Koza kov et al, 2011); (4-7) fields of Nd isotope evolution in: (4) crystalline rocks of Jargalant complex of Tarbagatai block (Kozakov et al, 2011), (5) gneisses and ultrametagenic granites of the Bayannur complex of Songino block, (6) rocks of Early Baikalian complexes of Param Shaman zone of the Baikal Muya belt (Rytsk et al, 2007), (7) crystalline rocks of Baidarik block (Kozakov et al, 2007) and Ider complex of the Tarbagatai block (Kozakov et al, 2011) ophiolitic zone from the Precambrian crust blocks of Central Hangay located to the north. The northeast ern extension of the Bayan Khongor zone in some schemes (Tektonika…, 1974;Karta…, 1989) (Zhao et al, 2006;Levashova et al, 2010), we cannot exclude that it overlies both Early Precambrian units of the Baidarik block and Early Baikalian formations of the Dzabkhan Mandal zone (Karta…, 1989).…”

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 99%

“…It was therewith revealed that the southeastern part of the Baidarik block basement of DM is represented by Late and not by Early Precambrian crystalline forma tions of the Tatsaingol complex associated with the Late Baikalian orogeny (Kozakov et al, 2008). It was also noted that the western part of the Tarbagatai block and a significant part of the Songino block were formed during the Early Baikalian orogeny (Kozakov et al, 2011). These data suggest a more complicated history of formation of the Precambrian blocks of the Khangai group, in turn raising the question of the extent of distribution in their limits of the Early and Late Precambrian complexes.…”

Section: Introductionmentioning

confidence: 95%

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The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

Козаков

Yarmolyuk

Ковач

et al. 2012

Stratigr. Geol. Correl.

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Fragments of continental blocks or microcontinents are represented in the Early Caledonian oro genic area of Central Asia (or Early Caledonian superterrane); the largest of these are the Dzabkhan and Tuva Mongolian microcontinents, with Early and Late Precambrian crystalline basements, respectively. In the linkage zone of these microcontinents, crystalline rocks of the Tarbagatai and Songino blocks that are considered as units of the Early Precambrian ensialic basement of the superterrane are also known. They are composed of strongly metamorphosed rocks formed during the Early Baikalian orogeny about 790 to 820 Ma. U Pb zircon dating and Nd isotope studies revealed, within the northwestern Dzabkhan microcontinent, the Dzabkhan Mandal zone of crystalline rocks associated with the Riphean crust forming process. The age of the gneiss substrate of this zone is estimated as 1.3 to 0.86 Ga. An early episode of metamorphism is dated at about 856 ± 2 Ma. The data available so far indicate a heterogeneous structure of the Dzabkhan microconti nent basement represented by Early Precambrian and Early and Late Baikalian crystalline formations.

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Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 93%

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 95%

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 98%

Section: Nd Isotopic Composition Of the Magmatic And Metamorphic Rocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

Козаков

Yarmolyuk

Ковач

et al. 2012

Stratigr. Geol. Correl.

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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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Accretionary complex: Geological records from oceanic subduction to continental deep subduction

Zhou

2020

Sci. China Earth Sci.

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Crystalline complexes of the Tarbagatai block of the Early Caledonian superterrane of Central Asia

Cited by 52 publications

References 17 publications

The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

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

Accretionary complex: Geological records from oceanic subduction to continental deep subduction

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