Geochronological, geochemical, and Sr–Nd–Hf isotopic studies of the Aketas adakitic granites in Eastern Junggar: Petrogenesis and tectonic implications

Zhang, Chen; Luo, Qun; Zhang, Xin; Liu, Luofu; Liu, Dongdong; Wang, Pengfei; Yang, Keji; Wang, Jian; Zhao, Yan

doi:10.1002/gj.2879

Cited by 9 publications

(3 citation statements)

References 109 publications

(249 reference statements)

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“…On the other hand, both intraplate and subduction-related features were described in the Yaryn Khad Pluton by Izokh et al (2011). Collisional stage in the Eastern Junggar fits interval 310-307 Ma (Zhang et al 2018a). Consequently, the Viséan/Serpukhovian magmatism in Edren Subzone was pre-collisional in relation to these events but probably situated far from the retreating subduction zone.…”

Section: The General Geotectonic Frameworkmentioning

confidence: 97%

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From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

Hanžl¹,

Janoušek²,

Hrdličková³

et al. 2023

J. Geosci.

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The Trans-Altai Zone in the southern tract of the Central Asian Oceanic Belt is composed of Early Palaeozoic oceanic crust preserved in Ordovician to Devonian ophiolite fragments and Devonian-Carboniferous igneous arcs. The Edren and Baaran subzones at the NW tip of the Trans-Altai Zone were intruded by Late Palaeozoic plutons that have been examined by the combined geochronological and geochemical study. Mississippian subduction-related plutons intruded Devonian and Carboniferous volcano-sedimentary sequences in two magmatic pulses. The older, Tournaisian plutons (dated at 352 ± 1 and 347 ± 4 Ma) occur in both subzones; the younger Visean/Serpukhovian ones (331 ± 1 Ma) are found only at the northern boundary of the Edren Subzone. All Mississippian rocks are high-K calc-alkaline and characterised by a strong enrichment of hydrous fluid mobile lithophile elements over conservative Nb, Ta and Ti relative to normal mid-ocean ridge basalts. Low 87 Sr/ 86 Sr i (~ 0.7035-0.7038) and highly positive ε i Nd values (+ 6.6 to + 5.2) suggest a relatively juvenile parental magma source with a short mean crustal residence. This corresponds well with the age of scarce inherited zircons, none of which is older than 530 Ma. The Early Permian post-tectonic plutons intruded the shallow crust of the Baaran Subzone (Devonian-Carboniferous flysch and Early Carboniferous volcanic arc). The prominent concentric body of the Aaj Bogd Pluton is composed of monzodiorites to monzogabbros (284 ± 1 and 294 ± 3 Ma) in its centre, surrounded by granite with syenite (282 ± 1 Ma) in the main mass of the pluton. Whole-rock Sr-Nd isotopic ratios match those of Carboniferous magmatic rocks, while trace-element patterns point to an intra-plate origin influenced by a fertile asthenospheric mantle component. On the other hand, the slightly older (290 ± 1 Ma) quartz syenites to alkali feldspar granites in the Baaran Subzone have spurious arc-like geochemistry inherited from their arc-related crustal source(s). Regional distribution of the numerous oval-shaped Early Permian alkaline post-orogenic plutons, some with A 2 -type granite affinity, follows the major Permian strike-slip zones spanning from the Dulate Arc in the west to the Khan Bogd Pluton in the east. These late, transcurrent zones apparently played an important role in late-orogenic magma generation, ascent and emplacement.

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Section: The General Geotectonic Frameworkmentioning

confidence: 97%

“…The c. 310 Ma volcanic-arc granitoids, some of which were termed "adakite" (Zhang et al 2018a) are common in the Eastern Junggar (Liu et al 2013). Similarly, Late Pennsylvanian (315-307 Ma) subduction-related granites (Guy et al 2014b;Zhou et al 2021) and c.…”

Section: Carboniferous Plutons Of the North--western Trans-altai Zonementioning

confidence: 99%

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

Hanžl¹,

Janoušek²,

Hrdličková³

et al. 2023

J. Geosci.

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“…(2021) and (c) Zhang et al. (2018), with additional details available in Figure S1 in Supporting Information S1. Fault zones are denoted in black text, and verified surface ruptures are indicated in red.…”

Section: Introductionmentioning

confidence: 99%

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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Geology, mineralization and magma evolution of the Zuun Mod Mo-Cu deposit in Southwest Mongolia

Altankhuyag,

Boldbaatar,

Tunnell

et al. 2023

Journal of Asian Earth Sciences

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Geochronological, geochemical, and Sr–Nd–Hf isotopic studies of the Aketas adakitic granites in Eastern Junggar: Petrogenesis and tectonic implications

Cited by 9 publications

References 109 publications

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

From magmatic arc to a post-accretionary setting: Late Palaeozoic granitoid plutons in the northwestern Trans-Altai Zone, Mongolia

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

Geology, mineralization and magma evolution of the Zuun Mod Mo-Cu deposit in Southwest Mongolia

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