Geochemistry and zircon U–Pb–Hf isotopes of granodiorites in the northern Alxa area: implications for the Middle–Late Devonian tectonic evolution of the southern Central Asian Orogenic Belt

Deng, Wen Bing; Shao, Zhaogang; Wang, Zengzhen; Chen, Xuanhua; Yi, Jinjun; Xu, Haijin

doi:10.1007/s00531-022-02233-x

Cited by 5 publications

(7 citation statements)

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“…That implies that the formation of the gabbro was prior to the extensional event occurring after the closure of the PAO. Furthermore, coeval granitoid displaying volcanic arc affinities have also been verified in the Zhusileng-Hangwula Belt (Li et al 2020;Song et al 2020;Zhao et al 2020;Deng et al 2022b). For instance, the 298-290 Ma granitoids in the Zhusileng-Hangwula Belt were generated by magma mixing and formed in a subduction setting (Liu et al 2018a).…”

Section: B Tectonic Implicationsmentioning

confidence: 89%

“…The Phanerozoic intrusions in the Zhusileng–Hangwula Belt were generated during the middle–late Devonian (399–373 Ma), late Carboniferous–middle Permian (325–263 Ma) and middle–late Triassic (250–216 Ma), including gabbro, diorite, granodiorite, granite and monzogranite (Fig. 1c; Wang et al 2002; Li, 2006; Han et al 2010; Dang et al 2011; Chen, 2015; Zhang et al 2017; Liu et al 2018a; Shi et al 2018; Chen et al 2019; Li et al 2020; Song et al 2020; Deng et al 2022b, 2023, b; Fei et al 2019; Zhao et al 2020).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

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Geochemistry, zircon U–Pb geochronology and Hf isotope of the early Permian gabbro and high-Mg diorites from the Zhusileng–Hangwula Belt in the northern Alxa area: Petrogenesis and tectonic implications

Deng

Shao

et al. 2023

Geol. Mag.

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As the southernmost part of the central segment of the Central Asian Orogenic Belt, the northern Alxa area is characterized by abundant Permian magmatism and records key information on the geological evolution of the Palaeo-Asian Ocean. This study reports new zircon U–Pb and Lu–Hf isotopic and whole-rock geochemical data of the early Permian (285–286 Ma) Huisentala gabbro and Huodonghaer diorites from the Zhusileng–Hangwula Belt in the northern Alxa area. The gabbro is characterized by high Al, Ca, Mg# and light rare-earth elements, and low K, P and high field strength elements (e.g., Ti, Nb and Ta). Furthermore, the gabbro shows heterogeneous zircon ϵHf(t) value (−2.5 to +2.6). The Huodonghaer diorites show high MgO (3.46–6.32 wt%), Mg# (49–58), Sr (408–617 ppm) and Ba (223–419 ppm), and low FeOT/MgO (1.27–1.83) and TiO2 (0.48–0.90 wt%), with geochemical features similar to the high-Mg andesite/diorite. They show radiogenic zircon ϵHf(t) values of +1.2 to +4.9 and high Th/Nb ratios. These features suggest that the Huisentala gabbro and the Huodonghaer diorites were derived from the partial melting of mantle peridotite that was metasomatized by subduction-related fluids and by subducted sediment-derived melts, respectively.

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Section: B Tectonic Implicationsmentioning

confidence: 89%

Section: Geological Setting and Samplesmentioning

confidence: 99%

Geochemistry, zircon U–Pb geochronology and Hf isotope of the early Permian gabbro and high-Mg diorites from the Zhusileng–Hangwula Belt in the northern Alxa area: Petrogenesis and tectonic implications

Deng

Shao

et al. 2023

Geol. Mag.

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“…Thus, a double-sided subduction of the North Qilian Ocean occurred between the Alxa block and North Qilian arc during the Devonian. By integrating our data with regional and paleomagnetic data (Deng et al, 2022;D. Fu et al, 2022D.…”

Section: Tectonic Setting Of the Jiayuguan Mélange Turbiditesmentioning

confidence: 99%

Tectonic Evolution of the Proto‒Tethys in the Early Devonian: Insights From the Turbidite in the North Qilian Belt, NW China

Mao,

Xiao,

Yan

et al. 2024

Earth and Space Science

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The Devonian tectonic setting is still controversial in the Proto‒Tethyan North Qilian belt. The Hexi Corridor of the North Qilian belt occupies a key position in constraining the tectonic evolution of the Proto‒Tethyan Ocean and the growth of the Asian continent. Turbidites, as an important component of the Jiayuguan mélange in the Hexi Corridor, consist of conglomerate, pebbly sandstone, sandstone, siltstone, calcareous mudstone, and chert that feature typical Bouma sequences of Ba, Bc, Bcd, Babc and/or Bab. They are strongly deformed into NW‒trending folds with NE‒ and SW‒inclined thrust faults. Detrital zircon U‒Pb dating results demonstrate that these sediments successively young to the southwest with maximum depositional ages (MDA) ranging from 560 Ma to 411 Ma, indicating that the youngest block was deposited after 411 Ma. Petrological, geochemical and detrital zircon U‒Pb age data indicate the sedimentary rocks provenanced from weak weathering, recycling, and multiple mixing sources, and that the dominant source was the Andean‒type Alxa arc. Together with the published data, we suggest that double‒sided subduction of the North Qilian Ocean (Proto‒Tethyan Ocean) occurred between the North Qilian arc and the Andean‒type Alxa arc during the early Devonian.

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“…The Early to mid‐Palaeozoic strata are almost successive, and the Late Palaeozoic strata are composed of clastic rocks, limestone, and minor volcanic rocks, which are unconformably overlain by Upper Triassic and Cretaceous continental clastic sediments (Chen et al, 2019). Phanerozoic plutons in the Zhusileng–Hangwula Belt were mainly generated during the Middle–Late Devonian (399–373 Ma), Late Carboniferous–Middle Permian (325–263 Ma), and Middle–Late Triassic (250–216 Ma; Chen et al, 2019; Dang et al, 2011; Deng, Shao, Wang, et al, 2022; R. W. Li et al, 2020; J. Z. Shi et al, 2018; D. F. Song et al, 2020).…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

“…As the southernmost segment of the CAOB, the northern Alxa area is the pivotal location linking the Central Tianshan Arc, as well as Beishan Orogenic Belt in the west and the Solonker Suture in the east (Figure 1b, T. R. Wu et al, 1998). Previous studies suggested that the initial subduction of the PAO in the northern Alxa area took place during the Devonian (Deng, Shao, Wang, et al, 2022; X. J. Shi et al, 2020). However, the timing of ocean closure and post‐collional extension in the northern Alxa area remain debated.…”

Section: Introductionmentioning

confidence: 97%

Late Palaeozoic tectonic evolution of the southern Central Asian Orogenic Belt: Constraints from the Early Permian magmatism in the northern Alxa area

Deng

Shao

et al. 2023

Geological Journal

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The northern Alxa area is the southernmost part of the central segment of the Central Asian Orogenic Belt and is located in a crucial junction to unravel the geological evolutionary history of the Palaeo‐Asian Ocean. Here, we present an integrated study of whole‐rock geochemistry, zircon U–Pb geochronology and zircon–Hf isotope on Early Permian igneous rocks from the Zhusileng–Hangwula Belt of the northern Alxa area. Three syenogranites, two monzogranites and one granodiorite are identified as peraluminous, (high‐potassium) calc‐alkaline I‐type granites. The zircon dating results show that they were formed during the Early Permian (291–285 Ma). Geochemically, these rocks show enrichments in light rare‐earth elements (LREEs), large‐ion lithophile elements (LILEs) and negative Nb–Ta anomalies, as well as low A/CNK values. Furthermore, the syenogranites have almost positive zircon εHf(t) values (−0.4 to +4.8) and Early Palaeoproterozoic–Mesoproterozoic Hf model ages (1,768–1,296 Ma), indicating that they were probably derived from juvenile crustal components, mixed with ancient continental crust. The monzogranites have markedly positive zircon εHf(t) values (+11.2 to +13.5) and Neoproterozoic–Cambrian Hf model ages (716–513 Ma), suggesting that they were generated by rapid reworking of newly formed juvenile material. The granodiorite shows positive zircon εHf(t) values (+4.0 to +7.0) and Mesoproterozoic Hf model ages (1,368–1,090 Ma), implying that the granodiorite was probably derived from the partial melting of the juvenile crust. Our geochronological, geochemical and isotopic data, combined with published data, unravel that a crustal thinning event that was simultaneous with more input of mantle materials in the northern Alxa area, implies that a subduction‐related extensional environment occurred in the Zhusileng–Hangwula Belt which is probably due to the slab rollback of the Paleo‐Asian Ocean during the Late Carboniferous–Early Permian.

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Geochemistry and zircon U–Pb–Hf isotopes of granodiorites in the northern Alxa area: implications for the Middle–Late Devonian tectonic evolution of the southern Central Asian Orogenic Belt

Cited by 5 publications

References 78 publications

Geochemistry, zircon U–Pb geochronology and Hf isotope of the early Permian gabbro and high-Mg diorites from the Zhusileng–Hangwula Belt in the northern Alxa area: Petrogenesis and tectonic implications

Geochemistry, zircon U–Pb geochronology and Hf isotope of the early Permian gabbro and high-Mg diorites from the Zhusileng–Hangwula Belt in the northern Alxa area: Petrogenesis and tectonic implications

Tectonic Evolution of the Proto‒Tethys in the Early Devonian: Insights From the Turbidite in the North Qilian Belt, NW China

Late Palaeozoic tectonic evolution of the southern Central Asian Orogenic Belt: Constraints from the Early Permian magmatism in the northern Alxa area

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