A Cambrian intra-oceanic subduction system in the Bozshakol area, Kazakhstan

Shen, Ping; Pan, Hongdi; Seitmuratova, Eleonora; Yuan, Feng; Jakupova, Sholpan

doi:10.1016/j.lithos.2015.02.025

Cited by 52 publications

(9 citation statements)

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“…The Junggar‐Balkhash Ocean existed at least since the Ediacaran because of the occurrence of gabbros with a zircon U‐Pb age of ~572 Ma and corresponding within‐plate basalts in the Mayile ophiolitic mélange of the southern WJT (Yang et al, ). The long‐term, double‐side subduction of the Junggar‐Balkhash Ocean (Chen et al, ; Zhu et al, ) gave birth to the BCA in the north (502–428 Ma) (Choulet et al, ; Degtyarev, ; Shen et al, ; Wang et al, ; Yang, Li, Xiao, et al, ; Yang et al, ) and the BMTA in the south (515–425 Ma) (Ren et al, ; Xu et al, ; Xu, Han, et al, ; Zhao et al, ). These two arcs were finally welded together by the end of the Silurian, as indicated by the development of the Late Silurian to Middle Devonian A‐type granitoids in the BCA (Chen et al, ; Choulet et al, ; Yin et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Magmatism in the BCA appears to be asynchronous along its strike (Ren et al, ). The BCA in NE Kazakhstan is characterized by the Middle Cambrian to Early Silurian arc‐related rocks (Degtyarev, ; Shen et al, ; Windley et al, ), whereas the BCA in the northern WJT of NW China between the Kujibai‐Hongguleleng and Chagantaolegai suture zones is predominantly composed of the Early Silurian arc igneous rocks and Ordovician‐Silurian marine sedimentary successions (Choulet et al, ; Wang et al, ; Yang, Li, Xiao, et al, ; Yang et al, ). In this interpretation, the BCA may serve as the basement of the Tacheng block (e.g., Chen, Han, Ji, et al, ; Han, Guo, & He, ) and it was likely formed in an intraoceanic setting related to northward subduction of the Junggar‐Balkhash oceanic lithosphere (Chen et al, ; Choulet et al, ; Degtyarev, ; Zhu et al, ) or southward subduction of the Irtysh‐Zaisan oceanic lithosphere (Shen et al, ; Yin et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Closure Time of the Junggar‐Balkhash Ocean: Constraints From Late Paleozoic Volcano‐Sedimentary Sequences in the Barleik Mountains, West Junggar, NW China

et al. 2017

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The Junggar‐Balkhash Ocean was a major branch of the southern Paleo‐Asian Ocean. The timing of its closure is important for understanding the history of the Central Asian Orogenic Belt. New sedimentological and geochronological data from the Late Paleozoic volcano‐sedimentary sequences in the Barleik Mountains of West Junggar, NW China, help to constrain the closure time of the Junggar‐Balkhash Ocean. Tielieketi Formation (Fm) is dominated by littoral sediments, but its upper glauconite‐bearing sandstone is interpreted to deposit rapidly in a shallow‐water shelf setting. By contrast, Heishantou Fm consists chiefly of volcanic rocks, conformably overlying or in fault contact with Tielieketi Fm. Molaoba Fm is composed of parallel‐stratified fine sandstone and sandy conglomerate with graded bedding, typical of nonmarine, fluvial deposition. This formation unconformably overlies the Tielieketi and Heishantou formations and is conformably covered by Kalagang Fm characterized by a continental bimodal volcanic association. The youngest U‐Pb ages of detrital zircons from sandstones and zircon U‐Pb ages from volcanic rocks suggest that the Tielieketi, Heishantou, Molaoba, and Kalagang formations were deposited during the Famennian‐Tournaisian, Tournaisian‐early Bashkirian, Gzhelian, and Asselian‐Sakmarian, respectively. The absence of upper Bashkirian to Kasimovian was likely caused by tectonic uplifting of the West Junggar terrane. This is compatible with the occurrence of coeval stitching plutons in the West Junggar and adjacent areas. The Junggar‐Balkhash Ocean should be finally closed before the Gzhelian, slightly later or concurrent with that of other ocean domains of the southern Paleo‐Asian Ocean.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Closure Time of the Junggar‐Balkhash Ocean: Constraints From Late Paleozoic Volcano‐Sedimentary Sequences in the Barleik Mountains, West Junggar, NW China

et al. 2017

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“…The main components of the Chingiz Arc include plutons (Chen et al, 2010(Chen et al, , 2015Wang et al, 2014;Yin et al, 2018), tholeiitic to calc-alkaline basalt, calc-alkaline andesite and dacite (Meng et al, 2010;Shen et al, 2012), and tuffaceous sedimentary rocks . The geochemical compositions of the volcanic and plutonic rocks indicate that they formed in a supra-subduction setting (Safonova et al, 2017;Shen, Pan, Seitmuratova, et al, 2015).…”

Section: 1029/2019tc005781mentioning

confidence: 99%

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

et al. 2020

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The Saur‐Chingiz Belt (SCB) in northern West Junggar is regarded as the amalgamation zone of the Saur and Chingiz arcs. It contains diagnostic rocks of accretionary origin, providing critical information about the evolution of the southern Paleo‐Asian Ocean. We recognize various lithologies in the SCB, including an ophiolitic mélange, turbidites, conglomerates, rhyolites, breccias, and diorites, and investigate the structures of the Hebukesaier ophiolitic mélange. Kinematic analysis indicates top‐to‐the‐N thrusting. A coarse‐grained gabbro (ca. 490 Ma) and a fine‐grained gabbro (ca. 318 Ma) have normal mid‐ocean ridge basalt (N‐MORB)‐type geochemical signatures, and three groups of pillow basalts exhibit N‐MORB, enriched mid‐ocean ridge basalt (E‐MORB), and ocean island basalts (OIB) fingerprints, respectively. Detrital zircons in tuffs, conglomerates, and turbidites associated with the Hebukesaier mélange display predominant ages of 410–440 Ma, which are consistent with the age of the Chingiz Arc. This suggests that the mafic rocks (ophiolitic components) in the Hebukesaier mélange were generated at a mid‐ocean ridge and were later accreted to the Chingiz Arc, which formed above a southward‐dipping subduction zone that consumed the Paleo‐Asian Ocean. The predominant zircon age peaks of turbidites from the Saur area, north of the Hebukesaier mélange, range from 326 to 360 Ma, which areconsistent with a provenance from the Saur Arc. The distinctive detrital zircons of the Chingiz and Saur arcs indicate that the northern boundary of the Hebukesaier mélange is the tectonic boundary between the Chingiz and Saur arcs. We suggest that Paleo‐Asian Ocean closed before Late Triassic as indicated by a diorite vein (ca. 218 Ma) that intruded the Hebukesaier mélange.

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“…The Boshchekul-Chingiz arc extends from central Kazakhstan to NW China (West Junggar, Fig. 1), and is characterized by Cambrian to Silurian volcanic and siliciclastic sequences (Chen et al, 2010;Shen et al, 2012;Degtyarev et al, 2015;Shen et al, 2015). The Baydaulet-Akbastau arc occurs to the south of the Boshchekul-Chingiz arc, and is dominated by Ordovician volcanic and volcano-sedimentary complexes (Degtyarev, 2011).…”

Section: Kazakhstan Microcontinent and Early Paleozoic Island Arc Sysmentioning

confidence: 99%

Geometry, kinematics and tectonic models of the Kazakhstan Orocline, Central Asian Orogenic Belt

Sun

Rosenbaum

et al. 2018

Journal of Asian Earth Sciences

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The Central Asian Orogenic Belt (CAOB) is one of the largest accretionary orogens on Earth and is characterized by the occurrence of tight oroclines (Kazakhstan and Tuva-Mongolian oroclines). The origin of these large-scale orogenic curvatures is not quite understood, but is fundamentally important for understanding crustal growth and tectonic evolution of the CAOB. Here we provide an outline of available geological and paleomagnetic data from the Kazakhstan Orocline, with an aim of clarifying the geometry, kinematics and geodynamic origin of the orocline. The Kazakhstan Orocline is evident in a total magmatic image, and can be traced by the continuation of high magnetic anomalies associated with the Devonian Volcanic Belt and the Late Devonian to Carboniferous Balkhash-Yili arc. Paleomagnetic data show ~112-126° clockwise rotation of the northern limb relative to the southern limb in the Late Devonian to Early Carboniferous, as well as ~15-28° clockwise rotation of the northern limb and ~39-40° anticlockwise rotation of the southern limb relative to the hinge of the orocline during the Late Carboniferous to Permian. We argue that the Kazakhstan Orocline experienced two-stage bending with the early stage of bending (Late Devonian to Early Carboniferous; ~112-126°) driven by slab rollback, and the later stage (Late Carboniferous to Permian; 54-68°) possibly associated with the amalgamation of the Siberian, Tarim and Baltic cratons. This new tectonic model is compatible with the occurrence of rift basins, the spatial migration of magmatic arc, and the development of large-scale strike-slip fault systems during oroclinal bending.

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A Cambrian intra-oceanic subduction system in the Bozshakol area, Kazakhstan

Cited by 52 publications

References 50 publications

Closure Time of the Junggar‐Balkhash Ocean: Constraints From Late Paleozoic Volcano‐Sedimentary Sequences in the Barleik Mountains, West Junggar, NW China

Closure Time of the Junggar‐Balkhash Ocean: Constraints From Late Paleozoic Volcano‐Sedimentary Sequences in the Barleik Mountains, West Junggar, NW China

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

Geometry, kinematics and tectonic models of the Kazakhstan Orocline, Central Asian Orogenic Belt

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