Precambrian ophiolite belts of southern Siberia, Russia, and their metallogeny

Konnikov, E. G.; Dobretsov, N. L.

doi:10.1016/0301-9268(92)90128-b

Cited by 29 publications

(22 citation statements)

References 8 publications

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“…5). They are intruded by ultramafics and layered gabbro and later by 820-Ma plagiogranites and gabbro (the Sunuekit, Irokindin, and Marinkin massifs) (Dobretsov et al, 1992;Konnikov et al, 1994) (Table 1). …”

Section: Baikal-muya East Sayan and Mongolian Ophiolites And Islandmentioning

confidence: 96%

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Opening and Tectonic Evolution of the Paleo-Asian Ocean

Dobretsov

Berzin

Buslov

1995

International Geology Review

323

127

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The Paleo-Asian ocean is defined by units located between the Russian (East European), Siberian, Tarim, and Sino-Korean (North China) continents. The study of the composition, age, and structural position of island-arc magmatic rocks, ophiolites, and high-pressure metamorphic assemblages and their mutual correlations made it possible to identify similarities and differences in the evolution of the Paleo-Asian and Paleo-Pacific oceans. The initial stage of the evolution of the Paleo-Asian ocean defined its opening at 900 Ma, whereas opening of the PaleoPacific took place at 750 to 700 Ma. Closing of the Paleo-Asian ocean in the Carboniferous (NE branch) and the Permian corresponds to the main stage of reorganization and re-opening of the Paleo-Pacific.The maximal opening of the Paleo-Asian ocean occurred after or simultaneously with the first accretion-collision event at 600 to 700 Ma, resulting from the collision of microcontinents and the Siberian continent. Vendian-Early Cambrian boninite-bearing island-arc complexes occur as lavas, sheeted dikes, and sill-dikes associated with gabbro-pyroxenites and ultramafics. These complexes are widely distributed in the Gornyy Altay, East Sayan, and West Mongolian regions and can be considered fragments of a giant boninite-bearing belt.In the late Early Cambrian, collision of seamounts with an island arc caused the squeezing of the subduction zone and return flows within the accretionary wedge. Serpentinite melange within fragments of ophiolites and high-pressure rocks are typical components of the Late Paleozoic accretionary wedges. Because of Middle Cambrian-Early Ordovician collisional events, two new oceans (Junggar-Irtysh-Kazakhstan and Uralian-South Tien Shan-South Mongolian) were formed. The junction of both oceans in East Mongolia opened to the PaleoPacific.

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Section: Baikal-muya East Sayan and Mongolian Ophiolites And Islandmentioning

confidence: 96%

“…7). It includes a restite of ultramafics, banded gabbro, pyroxenites, a dike complex, and pillow lavas (Dobretsov et al, 1992;Konnikov et al, 1994). The maximum age for the ophiolites is given by the 923 +72-Ma Kelanskaya volcanics, mostly of calc-alkaline island-arc type (Fig.…”

Section: Baikal-muya East Sayan and Mongolian Ophiolites And Islandmentioning

confidence: 97%

Opening and Tectonic Evolution of the Paleo-Asian Ocean

Dobretsov

Berzin

Buslov

1995

International Geology Review

323

127

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“…The basement of the Siberian platform (Figure 1) is made of Archean continental crust [e.g., Khain and Bozhko , 1988; Dobretsov et al , 1992; Delvaux et al , 1995a; Gusev and Khain , 1996]. Around 1900–1700 Ma the Siberian craton grows by the accretion of Archean blocks, which induces compressional deformation, plutonism, and metamorphism [e.g., Gusev and Khain , 1996].…”

Section: Geology and Tectonic Setting Of The Baikal Rift Systemmentioning

confidence: 99%

“…Around 1900–1700 Ma the Siberian craton grows by the accretion of Archean blocks, which induces compressional deformation, plutonism, and metamorphism [e.g., Gusev and Khain , 1996]. During the Riphean, rifting occurs in several places leading to the formation of intracontinental basins and of a passive margin along the southern border of the craton, north of the Paleo‐Asian ocean [ Zonenshain et al , 1990a, 1990b; Dobretsov et al , 1992; Belichenko et al , 1994; Delvaux et al , 1995a; Gusev and Khain , 1996]. Several microcontinents are scattered in this ocean: the Khamar Daban, Barguzin, Tuva‐Mongolia, and Kansk‐Derba blocks (Figure 1) [ Belichenko et al , 1994; Berzin et al , 1994; Melnikov et al , 1994; Delvaux et al , 1995a].…”

Section: Geology and Tectonic Setting Of The Baikal Rift Systemmentioning

confidence: 99%

How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

et al. 2009

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[1] Apatite fission track analysis (AFTA) data are used to bring new light on the long-term and recent history of the Baikal rift region (Siberia). We describe the evolution of the topography along a NW-SE profile from the Siberian platform to the Barguzin range across the Baikal-southern Patom range and the northern termination of Lake Baikal. Our results show that the Baikal-Patom range started to form in the Early Carboniferous and was reactivated in Middle Jurassic-Lower Cretaceous times during the orogenic collapse of the Mongol-Okhotsk belt. Samples located in the Siberian platform recorded a continuous sedimentation up to the early Carboniferous but remain unaffected by later tectonic episodes. The Barguzin basin probably started to form as early as Late Cretaceous, suggesting a continuum of deformation between the postorogenic collapse and the opening of the Baikal Rift System (BRS). The initial driving mechanism for the opening of the BRS is thus independent from the India-Asia collision. AFTA show a late Miocene-early Pliocene increase in tectonic extension in the BRS that confirms previous thoughts and might reflect the first significant effect of the stress field generated by the India-Asia collision.Citation: Jolivet, M., T.

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“…Rojas-Agramonte et al, 2013) and formed many suture zones which are characterised by development of ophiolites and HP to UHP metamorphic rocks (Kröner et al, 2007;Tagiri, Yano, Bakirov, Nakajima, & Uchiumi, 1995 (Safonova & Santosh, 2014;. Moreover, the age of seamounts ranges from Late Neoproterozoic (Dobretsov, Konnikov, & Dobretsov, 1992) to Permian (Miao et al, 2008) shows successive intra-plate oceanic magmatism. The rock association of seamounts in the CAOB mainly consists of pillow basalt, volcanic breccia, limestone, olistostrome, and terrestrial clastic rocks (Safonova et al, 2009;Safonova et al, 2011;.…”

Section: Outline Of the Western Central Asian Orogenic Beltmentioning

confidence: 99%

Kazakhstan Orocline bending in response to seamounts subduction

Yang

2019

Geological Journal

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Oroclines are map-view deformation of Earth's crust resulting from bending of quasi-linear elements. The Central Asian Orogenic Belt (CAOB) is one of the largest and long-lived accretionary orogens in the world and mainly consists of the Kazakhstan and Tuva-Mongolian oroclines. However, the mechanism of the oroclines is still in debate. Therefore, in this paper, we combine some investigation of high bathymetric relief resistance to subduction, review oroclinal bending models of the Kazakhstan Orocline, and propose a tentative model that involves asymmetric rollback in response to seamounts subduction and accretion, followed by bending associated with the convergence of the Siberian and Tarim cratons. Moreover, the role of pinning due to seamount and ridge subduction is probably more important than the convergence of continents in the CAOB. This model is compatible with the occurrence of seamounts, the spatial migration of intraoceanic arcs, and the development of multiple rollback processes during amalgamation of Eurasia. However, only geochemical and geochronological data will enable definition of the seamounts in CAOB so far, without much matching structural data. So we need more work to understand seamounts subduction and accretion as well as orocline bending in CAOB.

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Precambrian ophiolite belts of southern Siberia, Russia, and their metallogeny

Cited by 29 publications

References 8 publications

Opening and Tectonic Evolution of the Paleo-Asian Ocean

Opening and Tectonic Evolution of the Paleo-Asian Ocean

How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

Kazakhstan Orocline bending in response to seamounts subduction

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