A newly defined latest Carboniferous-Permian ridge subduction in the southern Altaids: Insights from adakitic, S-type, and I-type granitoids in the northern East Junggar (NW China)

Gan, Jingmin; Xiao, Wenjiao; Mao, Qigui; Wang, Hao; Yang, He; Sang, Miao; Jia, Xilai; Liu, Yin; Zhang, Zhiyong; Tan, Zhou; Li, Rui

doi:10.1080/00206814.2023.2246072

Cited by 3 publications

(2 citation statements)

References 160 publications

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“…This would be consistent with the observed high Vp/Vs and anisotropic nature of the lower crustal layer. Therefore, in this scenario, our seismic images would indicate a southward subduction of the oceanic slab, which is consistent with that in some recent studies (J. Gan et al., 2023; Z. Liu et al., 2020; H. Zhang et al., 2005). However, we note that earlier geological study also suggested a northward subduction of the Ob‐Zaisan Ocean during the amalgamation of the Altai and the Dulate arcs in the Chinese Altai‐East Junggar collage (Xiao et al., 2009).…”

Section: Discussionsupporting

confidence: 92%

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Impact of Ancient Tectonics on Intracontinental Deformation Partitioning: Insights From Crustal Structures of the East Junggar‐Altai Area

Yang,

Tian,

Wan

et al. 2024

JGR Solid Earth

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Compressive stress generated at collision fronts can propagate over long distances, inducing deformation within the continent's interior. Nevertheless, the factors governing the partitioning of intracontinental deformation remain enigmatic. The Altai Mountains serve as a type‐example of ongoing intracontinental deformation. Here, we investigate the crustal architecture of the Chinese Altai Mountains, using receiver functions obtained from newly deployed dense seismic nodal arrays. The new seismic results reveal distinct crustal features, including (a) a negative polarity discontinuity beneath Chinese Altai Mountains, suggesting a low‐velocity layer; (b) a north‐dipping mid‐crustal structure beneath the suture zone between East Junggar and Chinese Altai, indicating underthrusting of East Junggar's lower crust beneath the Chinese Altai Mountains; (c) a double Moho structure beneath East Junggar, revealing a high‐velocity lower crustal layer. In conjunction with constraints from previous multi‐disciplinary regional studies, the double Moho structures are interpreted as mafic restite from Late Paleozoic magma underplating. The addition of mafic materials can significantly enhance the rheological strength of East Junggar's crust, causing it to function as an indenter that thrust beneath the Chinese Altai Mountains during the subsequent convergence process. As a consequence, significant deformation occurs in the Chinese Altai region, resulting in the emergence of decollements, as evident by the negative polarity discontinuity. The presence of pre‐existing decollements makes the Altai Mountains region more susceptible to deformation, thereby facilitating the concentration of intracontinental deformation. These findings illuminate the evolution history of the Chinese Altai Mountains and highlight the great impacts of ancient tectonics on intracontinental deformation partitioning.

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Section: Discussionsupporting

confidence: 92%

“…Therefore, in this scenario, our seismic images would indicate a southward subduction of the oceanic slab, which is consistent with that in some recent studies (J. Gan et al, 2023;Z. Liu et al, 2020;H.…”

Section: Nature Of the Double Moho Structure Beneath The East Junggarsupporting

confidence: 93%

Impact of Ancient Tectonics on Intracontinental Deformation Partitioning: Insights From Crustal Structures of the East Junggar‐Altai Area

Yang,

Tian,

Wan

et al. 2024

JGR Solid Earth

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Intraplate thrust orogeny of the Altai Mountains revealed by deep seismic reflection

Zhang,

Zhao,

Zhao

et al. 2024

Science Bulletin

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Tectonic Anatomy Reveals the Chinese Altai‐Kuerti‐Dulate Arc Amalgamation in the Southern Altaids

Gan,

Xiao,

Mao

et al. 2024

Tectonics

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The Erqis tectonic belt, situated at the junction of the Chinese Altai‐East Junggar, originated through the subduction of the Ob‐Zaisan Ocean, playing a pivotal role in unraveling the tectonic evolution of the southern Altaids. Tectonic and provenance analyses discern three distinct arcs: the Chinese Altai in the north exhibits a protracted history from the late Cambrian to early Permian with a slender accretionary complex (AC) termed the Supute AC; the Kuerti intra‐oceanic arc in the middle emerged during the Silurian to Devonian coevally with a minor AC known as the Tesibahan AC; and the Dulate arc in the south predominantly evolved from the Middle Devonian to Permian, giving rise to the Fuyun AC that independently developed on its northern margin at least until ∼273 Ma. Our findings indicate the existence of multiple arcs within the Ob‐Zaisan Ocean, forming an archipelago paleogeography in the Paleo‐Asian Ocean. Provenance studies lead us to propose that cryptic sutures demarcating the Chinese Altai, Kuerti, and Dulate lie approximately along the Kuerti and Tesibahan faults, respectively, and that the oceanic branches between these arcs subducted northward beneath the Chinese Altai and Kuerti arcs and southward beneath the Dulate arc. Additionally, our work demonstrates the closure of the Ob‐Zaisan Ocean most probably postdates ∼273 Ma. Combining our data with previous research, we present a novel tectonic evolution model, elucidating several arc amalgamations with multiple subduction polarities between Chinese Altai and East Junggar throughout the late Cambrian to Permian.

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A newly defined latest Carboniferous-Permian ridge subduction in the southern Altaids: Insights from adakitic, S-type, and I-type granitoids in the northern East Junggar (NW China)

Cited by 3 publications

References 160 publications

Impact of Ancient Tectonics on Intracontinental Deformation Partitioning: Insights From Crustal Structures of the East Junggar‐Altai Area

Impact of Ancient Tectonics on Intracontinental Deformation Partitioning: Insights From Crustal Structures of the East Junggar‐Altai Area

Intraplate thrust orogeny of the Altai Mountains revealed by deep seismic reflection

Tectonic Anatomy Reveals the Chinese Altai‐Kuerti‐Dulate Arc Amalgamation in the Southern Altaids

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