Geochronology and geochemistry of Late Ordovician–Early Devonian gneissic granites in the Kumishi area, northern margin of the South Tianshan Belt: Constraints on subduction process of the South Tianshan Ocean

Chen, Bei; Long, Xiaoping; Yuan, Chao; Wang, Yujing; Sun, Min; Xiao, Wenjiao; Cai, Keda; Huang, Zhipei

doi:10.1016/j.jseaes.2014.09.034

Cited by 24 publications

(10 citation statements)

References 102 publications

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“…The closure of South Tianshan Ocean is also debated with four popular models as follows. (1) Northward subduction beneath the blocks of Kyrgyz Middle Tianshan‐Yili‐Chinese Central Tianshan (e.g., Y. G. Han et al, ; Xiao et al, ), (2) southward subduction beneath the Palaeozoic Tarim (e.g., Alexeiev et al, ; Charvet et al, ; Lin et al, ; B. Wang et al, ), (3) bidirectional subduction (e.g., Chen et al, ; Ge et al, ), and (4) bidirectional subduction during Early Palaeozoic times followed by northward consumption during the Late Palaeozoic (e.g., H. Huang et al, ; Jiang et al, ). Furthermore, the timing of the final closure of South Tianshan Ocean and amalgamation of Palaeozoic Tarim with the SW CAOB also remain controversial with suggestions varying from Late Devonian to Early Triassic (reviewed in B. F. Han et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…The closure of South Tianshan Ocean is also debated with four popular models as follows. (1) Northward subduction beneath the blocks of Kyrgyz Middle Tianshan-Yili-Chinese Central Tianshan (e.g., Y. G. Han et al, 2015;Xiao et al, 2013), (2) southward subduction beneath the Palaeozoic Tarim (e.g., Alexeiev et al, 2015;Charvet et al, 2011;Lin et al, 2013;, (3) bidirectional subduction (e.g., Chen et al, 2015;Ge et al, 2012), and (4) bidirectional subduction during Early Palaeozoic times followed by northward consumption during the Late Palaeozoic (e.g., H. Huang et al, 2013;Jiang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

et al. 2018

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The South Tianshan Terrane (STT) is located in the boundary between the south‐western Central Asian Orogenic Belt (CAOB) and the Tarim Craton and is a key area for understanding the geologic and tectonic history of the craton and the orogenic belt. In this paper, we report detrital zircon ages from the Late Palaeozoic and Mesozoic clastic sedimentary rocks from the southern part of STT. In combination with the U–Pb ages for felsic igneous and meta‐igneous rocks exposed in the STT and adjacent tectonic units, we identify several distinct age populations. Provenance analysis suggests that the detrital zircon grains were predominately derived from the felsic magmatic rocks in the Tarim Craton and South Tianshan Terrane. The pre‐Neoproterozoic age populations may be associated with the early history of the Tarim Craton. Several pulses of Neoproterozoic magmatism are revealed by our dataset, presumably related to the assembly and break‐up of the supercontinent Rodinia. The 995 to 901 Ma detrital zircon grains were likely sourced from magmatic rocks associated with the assembly of Neoproterozoic Tarim to Australia. Among the age population of 886 to 752 Ma, the older group might be related to the subduction‐related magmatism after the assembly of Rodinia, and the younger one records a protracted magmatic event in a continental rift‐related setting associated with the break‐up of Rodinia. Two younger Neoproterozoic age populations (736 to 694 Ma and 665 to 610 Ma), showing narrow spreads with weak peaks, represent the waning stages of igneous activities related to the break‐up of Rodinia. Regarding the Palaeozoic evolution, together with other evidence, our data indicate a two‐stage subduction model for the SW Palaeo‐Asian Ocean. The 490 to 384 Ma age population corroborates the existence of Early Palaeozoic continental arc magmatism at the northern margin of Palaeozoic Tarim generated by the bidirectional subduction of the South Tianshan Ocean. After a ~30 My period of tectonomagmatic quiescence, the second stage is marked by the northward subduction of the South Tianshan Terrane during Late Devonian to Early Carboniferous. The final collision of Tarim and the south‐western CAOB likely occurred during the Late Carboniferous, followed by syn‐ and post‐collisional magmatism, as represented by the 320 to 265 Ma age population. Based on the detrital zircon ages in conjunction with the Hf isotopic features of zircons from Palaeozoic igneous rocks, our study does not support the model of large‐scale Phanerozoic net continental growth in the South Tianshan Terrane.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

et al. 2018

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“…Geologically, the Tianshan Belt is divided into three tectonic units: north, central, and south Tianshan (Gao et al, ; Gao, Long, et al, ). However, there is often confusion in correlating the subunits of Chinese Tianshan with the corresponding units in the Kazakh and Kyrgyz Tien Shan (B. Chen et al, ; Kröner et al, ; Ma, Shu, Jahn, Zhu, & Faure, ; Rojas‐Agramonte et al, ; Shu et al, ; Wang, Shu, et al, ). Geographically, the Tianshan Range is separated into southern and northern parts by the Mesozoic‐Cenozoic Kazakh‐Yili, and Tu‐Ha basins (Wang et al, ; Wang, Faure, et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…This model is supported by distribution of Palaeozoic arc magmatism (Dong et al, ; Long et al, ; Z. P. Ma et al, ), development of south‐vergent fold‐and‐thrust system (Xiao et al, ), and a widespread Palaeozoic sedimentary succession (Gao et al, ). (b) A southward subduction model (e.g., Charvet et al, ; B. Chen et al, ; Loury et al, ; Wang et al, ). This is supported by arc‐type magmatic rocks in the STOB (Guo et al, ; Lin et al, ; Zhong et al, ; Z. X. Zhu et al, ) and top‐to‐the‐north ductile deformation in metamorphic rocks and ophiolitic mélanges (Charvet et al, ; Lin et al, ; Wang et al, ).…”

Section: Implications For the Tectonic Evolution Of The Stobmentioning

confidence: 99%

“…By contrast, some others suggested that during the subduction of the major oceanic basin, opening of several back‐arc basins occurred (Charvet et al, ; Charvet, Shu, & Laurent‐Charvet, ; Dong et al, ; Gao et al, ; T. Jiang et al, ; Wang et al, , ). Three models have been proposed for subduction polarities, namely, northward subduction beneath the Central Tianshan‐Yili Block (Gao, Long, et al, ; B. F. Han et al, ; Y. G. Han et al, ; Windley, Allen, Zhang, Zhao, & Wang, ; Xiao et al, ), southward subduction beneath the Tarim Craton (Alexeiev et al, ; Charvet et al, ; B. Chen et al, ; Lin et al, ; Loury et al, ; Wang et al, ), or double‐sided subduction (Gao, Long, et al, ). Moreover, the final closure time of the South Tianshan Ocean varies from the Late Devonian to Middle Triassic (Charvet et al, ; Gao et al, ; B. F. Han et al, ; Y. G. Han et al, ; T. Jiang et al, ; Klemd et al, ; Lin, Faure, Shi, Wang, & Li, ; Wang et al, ; Xiao et al, ; Xu et al, ; Zhang, Ai, Li, et al, ; Zhang, Ai, Song, et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Accreted seamounts in the South Tianshan Orogenic Belt, NW China

Yang

et al. 2018

Geological Journal

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The South Tianshan Orogenic Belt (STOB) is situated in the southwest margin of the Central Asian Orogenic Belt and is characterized by the distribution of ophiolitic mélanges and metamorphic rocks. In this study, we focus on 5 ophiolitic mélanges with ocean island basalt (OIB) and aim to discuss the tectonic evolution of the South Tianshan Ocean. The Kynda, Kainar, Uchkel, Heiyingshan, and Guluogou ophiolitic mélanges in STOB mainly consist of metamorphic peridotite, gabbros, basaltic lavas (pillows), abyssal radiolarian cherts, and limestones. The basaltic rocks mainly occur as tectonic blocks within the mélanges. These basaltic rocks are characterized by LREE enrichment and HREE depletion, very weak or no Eu anomalies, and no obvious Nb, Ta, and Ti negative anomalies, positive εNd(t) values, relatively high initial 87Sr/86Sr ratios, and wide 206Pb/204Pb ratios, showing the signature of OIB. The OIB‐type rocks from Kynda, Kainar, and Guluogou are likely to be derived from garnet lherzolite by relatively high degrees of melting (10% to 20%). But the basaltic rocks of Uchkel and Heiyingshan formed at significantly lower degrees of partial melting (1% to 5%) of spinel and/or garnet lherzolite. The OIB‐type rocks in these ophiolitic mélanges are considered as accreted seamount fragments and may represent mantle plume‐related magmatism within the South Tianshan Ocean. In combination with previous work, we suggest an updated model, which is bidirectional oceanic subduction with seamounts accretion and subduction system, is suitable for Palaeozoic tectonic evolution of the South Tianshan Ocean.

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Age and tectonic setting of Neoproterozoic gneissic granites in the southern Yili Block (NW China) and implications for the origins of the continental blocks in SW Central Asian Orogenic Belt

et al. 2021

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Several ribbon-like continental fragments with Precambrian basement were wrapped within Palaeozoic accretionary complexes in the southwest Central Asian Orogenic Belt (CAOB). Their origins and tectonic evolution are essential for understanding the accretionary orogeny of the CAOB and crustal growth versus continental reworking in Phanerozoic. The southern Yili Block in NW of China is one of the major continental fragments in SW CAOB. In order to better constrain the tectonic settings of the Precambrian basement of the southern Yili Block, we present new data of field structures, whole-rock geochemical compositions, zircon U-Pb ages and Lu-Hf isotopic ratios of the Neoproterozoic gneissic granites. Ductile deformation characterized by mylonitic foliations and stretching/mineral lineation is commonly recognized in the gneissic granites, which were cross-cut by undeformed granitoids and mafic dykes. The gneissic granites yielded zircon U-Pb ages of 968 ± 5 Ma, 948 ± 8 Ma, and 873 ± 9 Ma. These gneissic granites show geochemical features of high potassium, peraluminous, calc-alkaline series, enrichment of Th, K, Rb and depletion of Ba, Nd, Sr. They show zircon ε Hf (t) values from À5.5 to 2.0 and two-stage zircon Hf model ages between 1.7 and 2.1 Ga. These new results indicate that the Neoproterozoic gneissic granites in the southern Yili Block derived from partial melting of metagreywackes that most likely had formed in a continental arc setting. A comparison of stratigraphy, magmatism and detrital zircon ages suggests that the southern Yili Block is similar with the northern Yili Block and Chinese Central Tianshan Block in term of Precambrian basement, and these continental fragments might have originated from Neoproterozoic orogenic belts. K E Y W O R D S crustal reworking, Kazakhstan microcontinent, microplate tectonics, Precambrian basement, tectonic evolution, Tianshan (Tien Shan) orogenic belt 1 | INTRODUCTION The Central Asian Orogenic Belt (CAOB) is situated between Baltic-Siberia cratons to the north and Tarim-North China cratons to the south (Figure 1a). It was built by welding of numerous Precambrian microcontinents and Palaeozoic arcs via a series of accretionary com-

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Geochronology and geochemistry of Late Ordovician–Early Devonian gneissic granites in the Kumishi area, northern margin of the South Tianshan Belt: Constraints on subduction process of the South Tianshan Ocean

Cited by 24 publications

References 102 publications

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

Accreted seamounts in the South Tianshan Orogenic Belt, NW China

Age and tectonic setting of Neoproterozoic gneissic granites in the southern Yili Block (NW China) and implications for the origins of the continental blocks in SW Central Asian Orogenic Belt

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