Geochronology, geochemistry and tectonic implications of a new ophiolitic mélange in the northern West Junggar, NW China

Zheng, Rongguo; Zhao, Lei; Yang, Yaqi

doi:10.1016/j.gr.2019.01.008

Cited by 43 publications

(19 citation statements)

References 76 publications

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“…Subduction of the Junggar-Balkhash Ocean seems to initiate before Early Ordovician in northern West Junggar. The Hebukesaier and E'min ophiolites to the north of the BC arc belonged to fore-arc SSZ-type and were formed at 484 Ma and 476 Ma, respectively (Du and Chen, 2017;Zheng et al, 2019). We proposed that, in the Early Ordovician, intra-oceanic BC arc separates the Junggar-Balkhash Ocean in the south from the Hebukesaier Ocean in the north (Fig.…”

Section: Early Paleozoic Tectonic Evolution In Northern West Junggarmentioning

confidence: 97%

“…An ophiolitic suture belt, marked by the Kujibai, E'min, Hebukesaier, Hongguleleng ophiolitic mé langes, occurs between the BC and ZS arcs. Zircon U-Pb ages of gabbroic blocks from these mé langes range from 510 to 480 Ma (Zhu and Xu, 2010;Zhang and Guo, 2010;Du and Chen, 2017;Yang et al, 2019;Zheng et al, 2019). Stitching plutons crosscutting the mé lange were formed at ca.…”

Section: Geological Settingsmentioning

confidence: 99%

“…Northward subduction of Hebukesaier Ocean likely gave rise to the Ordovician basement of the Tarbagtay Mountains. The Hebukesaier Ocean was closed before 440 Ma (Du et al, 2019;Zheng et al, 2019) and then the BC arc and Tarbagtay arc had amalgamated together.…”

Section: Early Paleozoic Tectonic Evolution In Northern West Junggarmentioning

confidence: 99%

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Detrital Zircon U‐Pb Geochronology and Provenance of the Hebukesaier Formation in the Shaerbuerti Mountains, Northern West Junggar: Implication for Devonian Subduction of the Junggar–Balkhash Ocean

Liang

Chen

et al. 2020

Acta Geologica Sinica (Eng)

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Limited Devonian magmatic record in northern West Junggar leads to contrasting models on its tectonic evolution. In this study, we conducted LA-ICP-MS U-Pb dating on detrital zircons of two sandstones from the Hebukesaier Formation in the Shaerbuerti Mountains. Detrital zircons with oscillatory zoning are characterized by high Th/U (> 0.3) and low La/Yb (< 0.15), indicating their magmatic origin. The youngest zircon ages of two samples are 402 ± 2 Ma and 406 ± 2 Ma, respectively, suggesting that the Hebukesaier Formation was deposited at the Early Devonian. Detrital zircon age patterns show single peaks (at ca. 424 Ma, n =157), which indicates that these clastics were likely proximal accumulation after short distance transportation. Provenance of the Hebukesaier Formation was the Xiemisitai and Shaerbuerti Mountains. Detrital zircon ages range from 481 Ma to 395 Ma, which indicates that there was relatively continuous Early Paleozoic magmatism in the Xiemisitai and Shaerbuerti Mountains since the Early Ordovician. Age spectrums of sampled detrital zircons are distinct from those of Lower Devonian strata either in southern West Junggar or in East Junggar, which implies for individual tectonic evolution of northern West Junggar. We favor that Lower Devonian Hebukesaier Formation was developed in a fore-arc setting due to the northward subduction of the Junggar-Balkhash Ocean.

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Section: Early Paleozoic Tectonic Evolution In Northern West Junggarmentioning

confidence: 97%

Section: Geological Settingsmentioning

confidence: 99%

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Detrital Zircon U‐Pb Geochronology and Provenance of the Hebukesaier Formation in the Shaerbuerti Mountains, Northern West Junggar: Implication for Devonian Subduction of the Junggar–Balkhash Ocean

Liang

Chen

et al. 2020

Acta Geologica Sinica (Eng)

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“…Most studies focus on two regions in the southernmost part of the CAOB: Northern Xinjiang in the west and Inner Mongolia in the east. So far, relatively few studies have focused on the central region of the southernmost margin of the CAOB, such as the northern margin of the Alxa Block (Chen et al, ; Chen, Wu, Gan, Zhang, & Fu, ; Han, Zhou, Wang, & Cao, ; Shi et al, ; Windley & Xiao, ; Zhang et al, ; Zhang, Wang, Wang, Liu, & Li, ; Zheng, Li, Xiao, & Wang, ; Zheng, Zhao, & Yang, ).…”

Section: Introductionmentioning

confidence: 99%

Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt

Yin¹,

Zhou

Zhang

et al. 2020

Geological Journal

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Understanding the tectonic nature of the Alxa area is significant in tectonic reconstruction of the Central Asian Orogenic Belt, but their tectonic correlation, affinity, and implications have not been well defined. The late Palaeozoic sediments in the northern Alxa area can help to understand this question. The sedimentary sequence of the late Palaeozoic strata (Benbatu Formation) indicates that the sedimentary environment of the study area gradually changed from a stable carbonate platform to a bathyal‐abyssal environment with relatively active tectonic setting. The results of the grain size analysis of the sandstone debris show the typical characteristics of a turbidity current. The composition of clastic particles is mainly feldspar, which is characterized by short transport distance and rapid deposition of sediments. Combined with the geochemical characteristics of sandstone, the northern Alxa Block is considered to be an active continental margin in the late Palaeozoic. Through summarizing the zircon data of the Alxa Block, Tarim Craton, and North China Craton, it is concluded that the Palaeozoic clastic zircons in the study area come from the Alxa Block and the surrounding magmatic arc, the Neoproterozoic‐Middle Proterozoic zircons come from the Alxa Block, the Archean zircons come from the North China Craton. According to the age distribution of clastic zircons, the magmatic activity may exist in the early Palaeozoic, which suggests it may not be a stable passive continental margin in the margin of northern Alxa Block in the early Palaeozoic. Based on the provenance analyses, the sources block shows no tectonic affinity to the Tarim Craton, but the Hanwula area in the north of the study area might have been accreted to the Tarim Craton, which means the size of the Paleo‐Asian Ocean between the study area and the Hangwula area is large. The earliest Palaeozoic clastic zircon ages in sedimentary rocks are recorded in the late Cambrian, whereas the earliest Palaeozoic detrital zircons in the Hangwula area are recorded in the Ordovician, which means that the magmatic activity recorded in the study area is earlier than the Hangwula area and indicates that the subduction of the south side of the Paleo‐Asian Ocean began earlier than the north side. The evidence of magmatic rocks discovered so far confirms this view.

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“…It is an important part of the Central Asian‐Xingmeng Macroscopic Tectonic‐metallogenic domain (Cai et al, ; Cai, Long, Chen, Sun, & Xiao, ; Zhang & Zhu, ; Zhu, Zhang, Gu, Guo, & Zhou, ) and is also one of the research hot spots of the CAOB. Many significant achievements and remarkable progresses have been made in the geologic structure, tectonic evolution, and metallogenesis of metallic deposits in this area (Kovalenko et al, ; Geng et al, ; Tang et al, ; Liu et al, ; Chen et al, ; Liu, Li et al, ; Yang, Li, Tong, Wang, & Wu, ; Yin et al, ; Furnes & Safonova, ; Zhang, Xiao et al, ; Zheng, Zhao, & Yang, ). Since the Palaeozoic, Siberian, Kazakhstan, and Tarim plates have been assembled together in the north‐west corner of China and the vast areas that extend outward, which include the West Junggar.…”

Section: Introductionmentioning

confidence: 99%

Geochronology, geochemistry, and Hf isotopes of mafic rocks from Dalabute ophiolitic mélange in West Junggar, Xinjiang (NW China): Implications for the magmatic source and tectonic setting

Yang

et al. 2020

Geological Journal

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Several Palaeozoic ophiolitic mélanges distributed in the West Junggar, Xinjiang, are remnants of the Paleo‐Asian Ocean evolution. They are important keys for studying the component, tectonic evolution, and crust–mantle interaction of the Central Asian Orogenic Belt (CAOB). This paper presents petrology, zircon U‐Pb chronology, geochemistry, and Hf isotope data of mafic rocks from the Dalabute ophiolitic mélange, West Junggar. The zircon U‐Pb chronology data of gabbro in the Dalabute ophiolitic mélange can be divided into two groups. The first group magmatic zircons yield a weighted mean age of 389.7 ± 7.7 Ma. It suggests that gabbros of the Dalabute ophiolitic mélange were formed during the period of Early‐middle Devonian, which represents the main period that the Dalabute back‐arc ocean basin expanded. The second group inherited zircons with ages ranging from 910 to 975 Ma were interpreted as Neoproterozoic materials of basement entered its magmatic source. Geochemical characteristics show that the mafic rocks from the Dalabute ophiolitic mélange can be subdivided into alkaline and tholeiite series. Whole‐rock and Hf isotopic data indicate that alkaline basalts have the signatures of typical OIB and formed in the oceanic island or seamount settings related to mantle plume, which were most likely derived from an enriched mantle source. Besides, tholeiitic rocks exhibit the features of MORB and generated in an immature back‐arc basin in the supra‐subduction zone. Their magmas originated from a depleted mantle that had been metasomatized by subduction‐related fluids and contaminated by materials with crustal nature. Therefore, Dalabute ophiolites are supposed to be generated from a back‐arc oceanic basin, which is relate to intra‐subduction and with mantle plumes developed within it. These results jointly provide convincing evidence for the evolution and property of the Dalabute ophiolite in the West Junggar and further supply reference and base for reconstruct the evolutionary history of the CAOB.

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Geochronology, geochemistry and tectonic implications of a new ophiolitic mélange in the northern West Junggar, NW China

Cited by 43 publications

References 76 publications

Detrital Zircon U‐Pb Geochronology and Provenance of the Hebukesaier Formation in the Shaerbuerti Mountains, Northern West Junggar: Implication for Devonian Subduction of the Junggar–Balkhash Ocean

Detrital Zircon U‐Pb Geochronology and Provenance of the Hebukesaier Formation in the Shaerbuerti Mountains, Northern West Junggar: Implication for Devonian Subduction of the Junggar–Balkhash Ocean

Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt

Geochronology, geochemistry, and Hf isotopes of mafic rocks from Dalabute ophiolitic mélange in West Junggar, Xinjiang (NW China): Implications for the magmatic source and tectonic setting

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