An Early Paleozoic collisional event along the northern margin of the Central Tianshan Block: Constraints from geochemistry and geochronology of granitic rocks

Wang, Meng; Zhang, Jinjiang; Zhang, Bo; Guowei, Qi

doi:10.1016/j.jseaes.2014.07.001

Cited by 30 publications

(11 citation statements)

References 64 publications

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“…Both the detrital zircon age spectra and εHf(t) values are comparable with the magmatic record in the Yamansu‐Central Tianshan arc. Detrital zircon ages within the interval of 310–440 Ma overlap with the age of widespread late Ordovician to Carboniferous granitic plutons of the Yamansu‐Central Tianshan Arc (Ma et al, ; Wang, Zhang, Zhang, & Qi, ; Yin et al, ; Zhang et al, ). Besides, the age‐εHf(t) values of sample 17YMS02 aged 300–500 Ma all overlap with the values of the Yamansu‐Central Tianshan arc and contains no Dananhu arc‐like zircons aged 350–500 Ma with high εHf(t).…”

Section: Discussionmentioning

confidence: 99%

Latest Permian–early Triassic arc amalgamation of the Eastern Tianshan (NW China): Constraints from detrital zircons and Hf isotopes of Devonian–Triassic sediments

et al. 2019

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The temporal–spatial framework of arc amalgamation is an important key for understanding the anatomy of orogenic collages, present and past. The Junggar‐Balkhash Ocean was a major branch of the southern Paleo‐Asian Ocean where several arcs were amalgamated. Among them, the Dananhu arc with its characteristic juvenile magmatism and lack of Precambrian basement is an efficient recorder of the evolutional history. From our U–Pb and Lu–Hf isotopic analyses of Devonian to Triassic sediments in the Dananhu arc and Permian sediments in the Yamansu‐Central Tianshan arc, we discovered two major changes in detrital zircon provenance of the Dananhu arc: (a) An increasing input of Precambrian ages from the Mongolia collage at 850, 1,850, and 2,500 Ma, together with Phanerozoic zircons ranging from 420 to 480 Ma with negative εHf(t) value since ca. 288 Ma; (b) the presence of the Yamansu‐Central Tianshan arclike Precambrian age cluster of 1,400–1,600 Ma around 243 Ma. In combination with regional tectonothermal events, these two changes correspond to the formation of the Harlik‐Dananhu composite arc in the latest Carboniferous–early Permian followed by its collision with the Yamansu‐Central Tianshan arc in the latest Permian–early Triassic, which marks the termination of the eastern Junggar‐Balkash Ocean. Analysis of the sedimentary successions within the intraoceanic arcs sheds light on the amalgamation history of the Central Asian Orogenic Belt.

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Section: Discussionmentioning

confidence: 99%

Latest Permian–early Triassic arc amalgamation of the Eastern Tianshan (NW China): Constraints from detrital zircons and Hf isotopes of Devonian–Triassic sediments

et al. 2019

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“…The volcanic rocks interbedded within the Paleozoic sediments have subduction-related geochemical features (Che et al, 1994;Zhu et al, 2005Zhu et al, , 2009Li et al, 2010Li et al, , 2017. The granitoids, which are widely distributed and intruded into the Proterozoic to Paleozoic volcanic-sedimentary rocks, are mainly composed of adamellite, moyite, diorite and quartz diorite with different ages (Tang et al, 2010;Long et al, 2011;Dong et al, 2011;Ma et al, 2014;Wang et al, 2015;Zhong et al, 2015). Moreover, several ophiolitic mélanges have been recognized in the CTB, such as the Bingdaban, Mishigou and Gangou ophiolitic mélanges (Charvet et al, 2007;Dong et al, 2006Dong et al, , 2007.…”

Section: Geological Background and Features Of The Bayingou Ophiolitimentioning

confidence: 99%

Accreted seamounts in North Tianshan, NW China: Implications for the evolution of the Central Asian Orogenic Belt

Yang

Kerr

et al. 2018

Journal of Asian Earth Sciences

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A B S T R A C T The Carboniferous Bayingou ophiolitic mélange is exposed in the North Tianshan accretionary complex in the southwestern part of the Central Asian Orogenic Belt (CAOB). The mélange is mainly composed of serpentinised ultramafic rocks (including harzburgite, lherzolite, pyroxenite, dunite and peridotite), pillowed and massive basalts, layered gabbros, radiolarian cherts, pelagic limestones, breccias and tuffs, and displays blockin-matrix structures. The blocks of ultramafic rocks, gabbros, basalts, cherts, and limestones are set in a matrix of serpentinised ultramafic rocks, massive basalts and tuffs. The basaltic rocks in the mélange show significant geochemical heterogeneity, and two compositional groups, one ocean island basalt-like, and the other mid-ocean ridge-like, can be distinguished on the basis of their isotopic compositions and immobile trace element contents (such as light rare earth element enrichment in the former, but depletion in the latter). The more-enriched basaltic rocks are interpreted as remnants/fragments of seamounts, derived from a deep mantle reservoir with low degrees (2-3%) of garnet lherzolite mantle melting. The depleted basalts most likely formed by melting of a shallower spinel lherzolite mantle source with ∼15% partial melting. It is probable that both groups owe their origin to melting of a mixture between plume and depleted MORB mantle. The results from this study, when integrated with previous work, indicate that the Junggar Ocean crust (comprising a significant number of seamounts) was likely to have been subducted southward beneath the Yili-Central Tianshan block in the Late Devonian-Early Carboniferous. The seamounts were scraped-off and accreted along with the oceanic crust in an accretionary wedge to form the Bayingou ophiolitic mélange. We present a model for the tectonomagmatic evolution of this portion of the CAOB involving prolonged intra-oceanic subduction with seamount accretion

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“…Early Palaeozoic arc‐type magmatic rocks have been documented in several blocks, for example, the Yili Block (Gao et al, ), the Central Tianshan Block, and also in some continental blocks within the Central Asian territories (Wang et al, ). Magmatic rocks older than ~430 Ma in the southern Yili Block and the Central Tianshan Block are considered as the result of the Terskey or Paleo‐Tianshan oceanic subduction (Gao et al, ; Ma, Shu, Santosh, & Li, ; Wang, Zhang, Zhang, & Qi, ). Middle–Late Ordovician arc‐type granitoids in the northern Yili Block are found only in the Wenquan area (Hu, Wei, Zhang, Deng, & Chen, ; Huang et al, ; Wang et al, ), which indicate the initiation of subduction of the NTO in the Middle Ordovician in this area (Huang et al, ; Tang et al, ).…”

Section: Discussionmentioning

confidence: 99%

Detrital zircon U–Pb–Hf isotopes study of the Lower Carboniferous Anjihai Formation from the northern margin of the Yili Block, NW China

et al. 2018

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The North Tianshan Accretionary Complex represents a Late Palaeozoic suture between the Junggar Terrane and the Yili Block. We report detrital zircon U–Pb dating and Hf isotope results for a sandstone from the Lower Carboniferous Anjihai Formation in the northern margin of the Yili Block, to reveal the geochronological framework of the northern Yili Block, and discuss the subduction process of the North Tianshan Ocean (NTO). The detrital zircon ages were divided into 2 clusters, namely, the Precambrian and Palaeozoic ones. The Palaeozoic age group can be further divided into 3 subgroups, that is, 472–461 Ma, 448–423 Ma, and 406–335 Ma, with peaks at 465, 436, and 346 Ma, respectively. All the Palaeozoic zircons have oscillatory zoning textures and high Th/U ratios, showing an igneous provenance. The zircon Ti‐temperatures are between 584 and 809 °C, suggesting that their source rocks were I‐ or S‐type granitic rocks. In addition, most of the Palaeozoic zircons have positive εHf(t) values, indicating that the source rocks of the Palaeozoic zircons are derived from not only Mesoproterozoic continental crust but also involved depleted mantle components, which matched well with the Hf isotopic signatures of magmatic rocks from the northern Yili Block. Based on the regional geology, these zircons were thought to be sourced from magmatic rocks that were related to the subduction of the NTO. Taking into consideration the Middle–Late Ordovician arc‐type granitoids in the Wenquan area, we conclude that the northern margin of the Yili Block was a unified active continental margin in the Palaeozoic, and the subduction of the NTO started at least from the Middle Ordovician.

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An Early Paleozoic collisional event along the northern margin of the Central Tianshan Block: Constraints from geochemistry and geochronology of granitic rocks

Cited by 30 publications

References 64 publications

Latest Permian–early Triassic arc amalgamation of the Eastern Tianshan (NW China): Constraints from detrital zircons and Hf isotopes of Devonian–Triassic sediments

Latest Permian–early Triassic arc amalgamation of the Eastern Tianshan (NW China): Constraints from detrital zircons and Hf isotopes of Devonian–Triassic sediments

Accreted seamounts in North Tianshan, NW China: Implications for the evolution of the Central Asian Orogenic Belt

Detrital zircon U–Pb–Hf isotopes study of the Lower Carboniferous Anjihai Formation from the northern margin of the Yili Block, NW China

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