Carboniferous-Permian tectonic transition envisaged in two magmatic episodes at the Kuruer Cu-Au deposit, Western Tianshan (NW China)

Yu, Jie; Li, Nuo; Qi, Nan; Guo, Jianping; Chen, Yanjing

doi:10.1016/j.jseaes.2017.07.048

Cited by 16 publications

(7 citation statements)

References 55 publications

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“…At this location, the termination of the MTS and the E-W strike of the STS give rise to a mainly compressional flower-type structure along the STS. This tectonic phase directly followed a major phase of sinistral deformation along the STS, coeval with HT metamorphism and magmatism in the Early-Middle Permian at 287-265 Ma in the Pobedi Range and along strike in the Chinese STS (e.g., Loury et al, 2018a;Yu et al, 2017;Wali et al, 2017;Zhong et al, 2017). These main compressional shear zone phases occurred after 265 Ma, in agreement consistent with the 40 Ar/ 39 Ar age of 256-265 Ma obtained on biotites in the Pobedi HT unit (Loury et al, 2018a).…”

Section: Tectonic Significance Of the Permian 40 Ar/ Ar And Ahe Agesmentioning

confidence: 99%

Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

Rolland

Jourdon

Petit

et al. 2020

Journal of Asian Earth Sciences

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Section: Tectonic Significance Of the Permian 40 Ar/ Ar And Ahe Agesmentioning

confidence: 99%

Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

Rolland

Jourdon

Petit

et al. 2020

Journal of Asian Earth Sciences

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“…The Permian sequences are mainly composed of conglomerate, sandstone and small amounts of bimodal volcanic rocks (XBGMR 1993). Early Carboniferous to Permian plutonic rocks also well developed in the Yili-Central Tianshan Block (Bao et al 2018;Gao et al 2009a;Han et al 2010;Long et al 2011;Wang et al 2009;Xu et al 2013;Yin et al 2016;Yu et al 2018). The Jurassic strata are made up of fluvio-lacustrine deposits, such as conglomerate, sandstone and mudstone (XBGMR 1993).…”

Section: Geological Backgroundmentioning

confidence: 99%

Carboniferous back-arc extension in the southern Yili-Central Tianshan Block and its significance to the formation of the Kazakhstan Orocline: insights from the Wusun Mountain volcanic belt

Cai

Sun

et al. 2021

Int J Earth Sci (Geol Rundsch)

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In Central Asia, the Carboniferous is a crucial period in the formation of the Tianshan Belt and associated bending of the Kazakhstan tectonic collage. In order to reveal Carboniferous magmatic events of the region and their tectonic implications, we conducted field investigations, zircon U-Pb dating, whole-rock geochemical and Sr-Nd isotopic studies on the Early Carboniferous Dahalajunshan Formation and Late Carboniferous Yishijilike Formation volcanic rocks of the Wusun Mountain Range (southern Yili-Central Tianshan Block). Volcanic rocks of the Dahalajunshan Formation consist of calc-alkaline basalt, andesite and dacite, yielding new zircon U-Pb ages of ~ 350 Ma. They have positive whole-rock ε Nd (t) values (+ 0.5 to + 1.6). In contrast, the Yishijilike Formation volcanic rocks dominantly comprise alkaline and calc-alkaline bimodal suites that erupted at ~ 337 Ma to 313 Ma and have higher whole-rock ε Nd (t) values (+ 2.3 to + 4.3). These two episodes of Carboniferous magmatism were correlated with partial melting of depleted mantle that metasomatized by slab-derived fluids. The late Carboniferous Wusun Mountain magmatic belt shows characteristics of a back-arc system that evolved due to trench retreat relative to the southern margin of the Yili-Central Tianshan Block. This mechanism induced an extensional regime with gradually depleting magma sources. The asymmetric retreat of the paleo-subduction zones of the South Tianshan Ocean and Junggar Ocean relative to the Yili-Central Tianshan Block was hence a vital driving force for the bending of the Kazakhstan Orocline.

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“…Besides, scholars also thought that the Tarim-Tianshan-Junggar ocean was still active, and the subduction processes have lasted to the Permian-Triassic [25][26][27][28]. Others have suggested that the Pennsylvanian is a tec-tonic transitional regime from arc to postcollision due to their transitional characteristics in geochemistry [20,[29][30][31][32][33]. Due to the controversy on the beginning time of the postcollisional process, the Late Paleozoic (especially the Pennsylvanian) geodynamic mechanism of the CAOB is disputed.…”

Section: Introductionmentioning

confidence: 99%

The Pennsylvanian Composite Volcanism in the Bogda Mountains, NW China: Evidence for Postcollisional Rift Basins

Wang

et al. 2020

Lithosphere

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In this paper, we present new petrological, zircon U–Pb–Hf isotopic, bulk-rock geochemical, and Sr–Nd isotopic data for the rocks from the Pennsylvanian Liushugou and Qijiagou Formations, Bogda Mountains (BMs), northwest China. The new data help in understanding the petrogenesis and geodynamic background of the two formations, further constraining the evolution of BMs during the Pennsylvanian. The eastern Liushugou Formation is composed mainly of bimodal volcanic rocks, while the western Liushugou Formation is dominated by pillow basalts with interstitial limestones, peperites, and pyroclastic rocks. The Qijiagou Formation consists principally of bioclastic limestones, peperites, and volcanic and volcaniclastic rocks with turbidites. Depositional environment analyses of the Liushugou and Qijiagou Formations reveal subaqueous volcanism and a progressively deepening shallow marine environment with times. Zircon LA-ICP-MS U–Pb dating of felsic volcanic rocks from the Liushugou Formation indicates that the subaqueous volcanism occurred at ca. 310–302 Ma, viz., the Pennsylvanian era. The basaltic rocks from the Liushugou and Qijiagou Formations are high-K calc-alkaline, enriched in light rare earth elements and large-ion lithophile elements, and depleted in high-field-strength elements (Nb, Ta, and Ti). The above characteristics, together with their depleted isotopic signature (εNdt=3.0-8.1, εHft=8.0-15.6, and ISr=0.703-0.707), suggest the derivation from a depleted mantle source metasomatized by slab-derived fluids and sediment-derived melts. Most felsic volcanic rocks of the high-K calc-alkaline to shoshonite series from the Liushugou and Qijiagou Formations show features of the A2-type granites and have similar trace and isotopic composition to the basaltic rocks, which were probably generated from the partial melting of juvenile continental crust. Combining the newly acquired data with the regional geology, we propose that the Pennsylvanian volcanic and sedimentary rocks in the BMs were formed in a series of postcollisional rift basins which were related to local strike-slip faulting. Moreover, the volcanic rocks in the east were derived from a relatively deeper mantle source (thick lithosphere) due to their smaller rifting.

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Carboniferous-Permian tectonic transition envisaged in two magmatic episodes at the Kuruer Cu-Au deposit, Western Tianshan (NW China)

Cited by 16 publications

References 55 publications

Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

Thermochronology of the highest central Asian massifs (Khan Tengri - Pobedi, SE Kyrgyztan): Evidence for Late Miocene (ca. 8 Ma) reactivation of Permian faults and insights into building the Tian Shan

Carboniferous back-arc extension in the southern Yili-Central Tianshan Block and its significance to the formation of the Kazakhstan Orocline: insights from the Wusun Mountain volcanic belt

The Pennsylvanian Composite Volcanism in the Bogda Mountains, NW China: Evidence for Postcollisional Rift Basins

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