Geochemistry of mafic rocks and cherts in the Darbut and Karamay ophiolitic mélanges in West Junggar, northwestern China: Evidence for a Late Silurian to Devonian back-arc basin system

Zhang, Pan; Wang, Guocan; Polat, Ali; Shen, Tianyi; Chen, Yue; Zhu, Chengyu; Wu, Guiling

doi:10.1016/j.tecto.2018.08.018

Cited by 31 publications

(10 citation statements)

References 112 publications

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“…(c) Restoration of D1 fold axial planes of fabrics and D2 fold axial planes and late faults across the West Junggar. Data from: (1) Zhang et al., 2018; (2) Yin et al., 2013; (3) Song et al., 2020.…”

Section: Discussionmentioning

confidence: 99%

Crustal‐Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

et al. 2023

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Section: Discussionmentioning

confidence: 99%

Crustal‐Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

et al. 2023

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“…However, the components of the Dalabute ophiolitic mélange are relatively complete (Liu et al, 2009), and compared with the classical ophiolitic sequence, it merely lacks the sheeted dike that represents the expansion of oceanic crust. Under the regional tectonic stress, ophiolites generally thrust over or sandwiched between Lower Carboniferous flysches (Choulet et al, 2012;Zhang, Wang et al, 2018). The lithologies of Lower Carboniferous strata are mainly volcanic-sedimentary rocks including tuffs, tuffaceous siltstones, and minor amounts of siliceous rocks, volcanic breccias (Li et al, 2010).…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

“…The Dalabute ophiolitic mélange is the largest ophiolitic belt in the West Junggar which underwent a series of intensive deformation and metamorphism since Late Palaeozoic and make the complete sequence of ophiolite difficult to be preserved (Cawood et al, 2009;Dilek & Furnes, 2011;Kusky et al, 2013). Although lots of relevant researches have been carried out on the petrology, geochemistry, chronology, tectonic setting, and chromite mineralization (Choulet et al, 2012;Shi et al, 2012;Qiu & Zhu, 2017Zhang, Wang et al, 2018;, the evolution and property of the Dalabute ophiolite remain controversial.…”

Section: Introductionmentioning

confidence: 99%

Geochronology, geochemistry, and Hf isotopes of mafic rocks from Dalabute ophiolitic mélange in West Junggar, Xinjiang (NW China): Implications for the magmatic source and tectonic setting

Yang

et al. 2020

Geological Journal

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Several Palaeozoic ophiolitic mélanges distributed in the West Junggar, Xinjiang, are remnants of the Paleo‐Asian Ocean evolution. They are important keys for studying the component, tectonic evolution, and crust–mantle interaction of the Central Asian Orogenic Belt (CAOB). This paper presents petrology, zircon U‐Pb chronology, geochemistry, and Hf isotope data of mafic rocks from the Dalabute ophiolitic mélange, West Junggar. The zircon U‐Pb chronology data of gabbro in the Dalabute ophiolitic mélange can be divided into two groups. The first group magmatic zircons yield a weighted mean age of 389.7 ± 7.7 Ma. It suggests that gabbros of the Dalabute ophiolitic mélange were formed during the period of Early‐middle Devonian, which represents the main period that the Dalabute back‐arc ocean basin expanded. The second group inherited zircons with ages ranging from 910 to 975 Ma were interpreted as Neoproterozoic materials of basement entered its magmatic source. Geochemical characteristics show that the mafic rocks from the Dalabute ophiolitic mélange can be subdivided into alkaline and tholeiite series. Whole‐rock and Hf isotopic data indicate that alkaline basalts have the signatures of typical OIB and formed in the oceanic island or seamount settings related to mantle plume, which were most likely derived from an enriched mantle source. Besides, tholeiitic rocks exhibit the features of MORB and generated in an immature back‐arc basin in the supra‐subduction zone. Their magmas originated from a depleted mantle that had been metasomatized by subduction‐related fluids and contaminated by materials with crustal nature. Therefore, Dalabute ophiolites are supposed to be generated from a back‐arc oceanic basin, which is relate to intra‐subduction and with mantle plumes developed within it. These results jointly provide convincing evidence for the evolution and property of the Dalabute ophiolite in the West Junggar and further supply reference and base for reconstruct the evolutionary history of the CAOB.

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“…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;. The seamounts of the western CAOB mainly occur in South Ocean P. Zhang, Wang, et al, 2018).…”

Section: Outline Of the Western Central Asian Orogenic Beltmentioning

confidence: 99%

“…The basalts from seamounts occur as tectonic blocks within the mélanges which are composed of pelagic limestones, siliceous mudstone, and radiolarian chert, possessing formation characteristics of seamounts. Moreover, the basalts show alkaline and OIB affinity, are considered as accreted seamount fragments, and probably relate to plume magmatism in Junggar Ocean (Yang, Li, Xiao, et al, ; P. Zhang, Wang, et al, ).…”

Section: Seamounts Accretion In the Caobmentioning

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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Geochemistry of mafic rocks and cherts in the Darbut and Karamay ophiolitic mélanges in West Junggar, northwestern China: Evidence for a Late Silurian to Devonian back-arc basin system

Cited by 31 publications

References 112 publications

Crustal‐Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

Crustal‐Scale Disharmonic Structural Pattern of West Junggar: Unveiling a Permian Indentation of Junggar Block Into Northern Kazakhstan Orocline

Geochronology, geochemistry, and Hf isotopes of mafic rocks from Dalabute ophiolitic mélange in West Junggar, Xinjiang (NW China): Implications for the magmatic source and tectonic setting

Kazakhstan Orocline bending in response to seamounts subduction

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