Carboniferous volcanic rocks associated with back-arc extension in the western Chinese Tianshan, NW China: Insight from temporal-spatial character, petrogenesis and tectonic significance

Su, Wenbo; Cai, Keda; Sun, Min; Wan, Bo; Wang, Xiangsong; Bao, Zihe; Xiao, Wenjiao

doi:10.1016/j.lithos.2018.04.012

Cited by 28 publications

(19 citation statements)

References 67 publications

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“…In this contribution, we present new zircon U-Pb, wholerock major and trace element, and Sr-Nd isotopic data of the Carboniferous volcanic rocks from the Wusun Mountain Range, in the southern part of the Balkhash-Yili arc (Su et al 2018). Our data, together with published results, allow us to uncover the nature of the magma source, geodynamic process as well as the formation of the Kazakhstan Orocline in the Late Paleozoic accretionary orogenesis.…”

Section: Introductionmentioning

confidence: 78%

“…2). These volcanic strata mainly consist of basalt, trachy-andesite, andesite, dacite, rhyolite, pyroclastic rocks and intercalated with minor sandstones, conglomerates and limestones (An et al 2013;Su et al 2018;Tang et al 2013;Wang et al 2007b;XBGMR 1993;Zhu et al 2009). The Permian sequences are mainly composed of conglomerate, sandstone and small amounts of bimodal volcanic rocks (XBGMR 1993).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Complex subduction and accretion processes took place during the aforementioned period, producing massive Late Paleozoic magmatism in the western Chinese Tianshan, which is well recorded in a series of widespread Carboniferous volcanic rocks (XBGMR 1993). Previous studies suggested that they were formed in an intracontinental rift setting (Xia et al 2012;Xia and Li 2020), a continental arc setting (An et al 2013;Tang et al 2013;Wang et al 2007b;Yu et al 2016;Zhong et al 2017;Zhu et al 2009), a post-collisional setting (Chen et al 2020;Feng and Zhu 2019;Ge et al 2015;Long et al 2012;Sun et al 2008;Xiao et al 2010) or a back-arc extensional setting (Cao et al 2017;Qian et al 2006;Su et al 2018;Wang et al 2018aWang et al , b, 2019Yan et al 2015). Due to these controversial interpretations, their tectonic setting, and especially the implication that they have for the formation of the Kazakhstan Orocline, still warrant further elaboration.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 78%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Permian formations include the Early Permian bimodal volcanic rocks, and the Middle to Late Permian molasse deposition uncomfortably overlying the pre‐Permian rocks (He, Zhang, Wang, Qian, & Sun, ; Wang et al, ). Voluminous Ordovician‐Permian granitoids intrusions on both sides of the Yili Block (Figure 1b) were interpreted to be related to the subduction of the Junggar and/or South Tianshan oceans beneath the Yili Block (Huang et al, ; Long et al, ; Su et al, ; Wang et al, ; Xu et al, ; Zhong et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Ordovician-Permian granitoids intrusions on both sides of the Yili Block ( Figure 1b) were interpreted to be related to the subduction of the Junggar and/or South Tianshan oceans beneath the Yili Block (Huang et al, 2013;Long et al, 2011;Su et al, 2018;Wang et al, 2012;Xu et al, 2013;Zhong et al, 2017).…”

Section: Voluminousmentioning

confidence: 99%

Volcanic–plutonic connection and associated Au‐Cu mineralization of the Tulasu ore district, Western Tianshan, NW China: Implications for mineralization potential in Palaeozoic arc terranes

et al. 2020

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Constructing the plutonic–volcanic connections in volcanic arc setting is essential for understanding a variety of magmatic processes from continental crust differentiation to formation of magmatic‐hydrothermal ore deposits. Based on the combination of zircon U–Pb geochronology and Hf isotope and whole‐rock geochemistry and Sr‐Nd isotopes, we evaluated the potential connections between volcanic and plutonic rocks from the Tulasu Basin, the largest epithermal gold ore district in the Chinese Western Tianshan. The peak of volcanism coincides well with the major plutonism, representing an important magma event at ~347–367 Ma. These contemporaneous volcanic and plutonic rocks show broadly similar arc‐related geochemical signatures and zircon in‐situ Hf (εHf[t] = −1.0–14.3) and whole‐rock Nd (εNd[t] = −4.2–4.6) isotopic compositions, indicative of formation from parental magmas derived from a common depleted mantle source metasomatized by slab‐derived melts, despite diverse consequent processes (fractional crystallization, crustal contamination, and magma mixing/mingling) during their differentiation in a subduction‐related setting. Volcanic rocks from the Axi caldera in the centre of the Tulasu district are geochemically less evolved than the coeval porphyritic granite, which indicates that the intrusive rocks might originate from residual melts left behind by extraction of erupted magmas. In contrast, the porphyry Cu mineralized Kexiaxi pluton, which occurs in the margin of the Tulasu district, is compositionally indistinguishable from the coeval volcanic suites. This implies that the Kexiaxi pluton represents the intrusive equivalent of a common magma reservoir feeding the volcanic eruptions, and magma fluxes may have controlled their differentiation. We thus suggest that the depleted mantle derived calc‐alkaline magma, modified during slab‐related melt metasomatism, crustal contamination, and magma mixing may have played an important role in copper enrichment at Kexiaxi. Finally, the relatively water‐rich and fertile nature of arc magma of the Tulasu district indicates high exploration potential for significant porphyry Cu‐Au deposits. The existing alteration‐immobile fertility proxy (V/Sc) for intrusive rocks may also be useful to assess the fertility of cogenetic volcanic rocks, in turn with implications for unexposed porphyry Cu deposits at depths.

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Insight into the genesis of the Zhaosu Carboniferous Mn carbonate deposit (NW China): constraints from petrography, geochemistry, and C–Mo isotopes

et al. 2022

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Carboniferous volcanic rocks associated with back-arc extension in the western Chinese Tianshan, NW China: Insight from temporal-spatial character, petrogenesis and tectonic significance

Cited by 28 publications

References 67 publications

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

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

Volcanic–plutonic connection and associated Au‐Cu mineralization of the Tulasu ore district, Western Tianshan, NW China: Implications for mineralization potential in Palaeozoic arc terranes

Insight into the genesis of the Zhaosu Carboniferous Mn carbonate deposit (NW China): constraints from petrography, geochemistry, and C–Mo isotopes

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