The tectonic evolution of the Irtysh tectonic belt: New zircon U–Pb ages of arc-related and collisional granitoids in the Kalaxiangar tectonic belt, NW China

Hong, Tao; Klemd, Reiner; Gao, Jun; Xiang, Peng; Xu, Xing; You, Jun; Wang, Xinshui; Wu, Chu; Li, Hao; Ke, Qiang

doi:10.1016/j.lithos.2016.12.001

Cited by 39 publications

(14 citation statements)

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“…The Saur Arc in the Tarbagatay Belt contains andesites, granitoid, and intrusive plutons (Chen et al, 2010;Han et al, 2006;Zhou et al, 2008), and tuffaceous sedimentary rocks associated with Carboniferous volcanic rocks . With its juvenile Hf-in-zircon isotopic characteristics and typical arc-related geochemical signatures (Chen et al, 2010;Hong et al, 2017), the Saur part of the Zharma-Saur Terrane is interpreted as a late Paleozoic volcanic arc (Cai, 1988;Chen et al, 2017a;Zhu & Xu, 2006;Figure 1b). The late Carboniferous sedimentary rocks of the Saur Arc are dominated by Devonian to Carboniferous detrital zircon grains (Li et al, 2017;Safonova et al, 2017), whereas the Boshchekul-Chingiz Arc contains abundant early Paleozoic detrital zircons .…”

Section: 1029/2019tc005781mentioning

confidence: 99%

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

et al. 2020

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The Saur‐Chingiz Belt (SCB) in northern West Junggar is regarded as the amalgamation zone of the Saur and Chingiz arcs. It contains diagnostic rocks of accretionary origin, providing critical information about the evolution of the southern Paleo‐Asian Ocean. We recognize various lithologies in the SCB, including an ophiolitic mélange, turbidites, conglomerates, rhyolites, breccias, and diorites, and investigate the structures of the Hebukesaier ophiolitic mélange. Kinematic analysis indicates top‐to‐the‐N thrusting. A coarse‐grained gabbro (ca. 490 Ma) and a fine‐grained gabbro (ca. 318 Ma) have normal mid‐ocean ridge basalt (N‐MORB)‐type geochemical signatures, and three groups of pillow basalts exhibit N‐MORB, enriched mid‐ocean ridge basalt (E‐MORB), and ocean island basalts (OIB) fingerprints, respectively. Detrital zircons in tuffs, conglomerates, and turbidites associated with the Hebukesaier mélange display predominant ages of 410–440 Ma, which are consistent with the age of the Chingiz Arc. This suggests that the mafic rocks (ophiolitic components) in the Hebukesaier mélange were generated at a mid‐ocean ridge and were later accreted to the Chingiz Arc, which formed above a southward‐dipping subduction zone that consumed the Paleo‐Asian Ocean. The predominant zircon age peaks of turbidites from the Saur area, north of the Hebukesaier mélange, range from 326 to 360 Ma, which areconsistent with a provenance from the Saur Arc. The distinctive detrital zircons of the Chingiz and Saur arcs indicate that the northern boundary of the Hebukesaier mélange is the tectonic boundary between the Chingiz and Saur arcs. We suggest that Paleo‐Asian Ocean closed before Late Triassic as indicated by a diorite vein (ca. 218 Ma) that intruded the Hebukesaier mélange.

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Section: 1029/2019tc005781mentioning

confidence: 99%

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

et al. 2020

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“…There are two viewpoints about the tectonic setting of the late Carboniferous and early Permian plutons in the Zharma–Saur arc: those favouring the subduction situation (Chen, Xiao, Windley, Zhang, Sang et al, ; Chen, Xiao, Windley, Zhang, Zhou et al, ) and those favouring the post‐collisional extension (Chen, Han, Ji et al, ; Chen et al, ; Han et al, ; Hong et al, ; Kuibida et al, ; Zhou et al, , ).…”

Section: Discussionmentioning

confidence: 99%

“…Previous investigations indicated that the Irtysh–Zaysan Ocean closed after the Altai arc collided with the Zharma–Saur arc along the Irtysh–Zaysan suture zone (Figure b e.g., Buslov et al, ; Chen, Han, Ji et al, ; Han et al, ; Windley et al, ), but its final closure time is highly debated over recent years. Most researchers (Buslov et al, ; Chen, Han, Ji et al, ; Chen, Han, & Zhang, ; Glorie et al, ; Han et al, ; Hong et al, ; Kuibida et al, ; Kurganskaya, Safonova, & Simonov, ; Li et al, ; Li et al, ; Zhou et al, , ) argued for a Carboniferous termination for the Irtysh–Zaysan Ocean. However, lately, Chen, Xiao, Windley, Zhang, Sang et al () and Chen, Xiao, Windley, Zhang, Zhou et al () suggested that the consumption of the Irtysh–Zaysan oceanic plate lasted until the Middle Permian.…”

Section: Introductionmentioning

confidence: 99%

Timing of the final closure of the Irtysh–Zaysan Ocean: New insights from the earliest stitching pluton in the northern West Junggar, NW China

Liu

Chen

et al. 2017

Geological Journal

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A tight constraint on the closure time of the Irtysh–Zaysan Ocean, a major southwestern branch of the Paleo‐Asian Ocean, is crucial for understanding the final amalgamation of the Central Asian Orogenic Belt; however, no agreement has been reached. This study presents new zircon U–Pb ages and whole‐rock geochemical data for the Keluke composite pluton in the Zharma–Saur arc of the northern West Junggar (NW China). The Keluke composite pluton mainly includes the hornblende gabbro, gabbroic diorite, and K‐feldspar granite. The laser ablation inductively coupled plasma mass spectrometry zircon U–Pb dating indicates that the hornblende gabbro and K‐feldspar granite formed at 334 ± 1 Ma and 319 ± 4 Ma, respectively. The gabbroic and dioritic rocks are calc‐alkaline and arc‐related plutonism characterized by strong depletions in Nb–Ta–Ti, thus being the product of the subduction of the Irtysh–Zaysan Ocean. By contrast, the K‐feldspar granite is geochemically similar to the post‐collisional highly fractionated I‐type granite. In particular, when compared with regional magmatic events, the Keluke K‐feldspar granite represents the first stitching plutonism in response to the termination of the Irtysh–Zaisan Ocean, which strongly indicates that the Irtysh–Zaisan Ocean was closed prior to the earliest late Carboniferous.

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“…It was tectonically accreted to the southern margin of the Siberian continent (Cai et al, 2015). Moreover, the Chinese Altai occupies the main portion of the Altai-Mongolian Terrane (or Altai Superterrane) and is separated from the Junggar Block in the south by the Irtysh (Erqis) strike-slip fault zone (Cai et al, 2015;Hong et al, 2017;Yang et al, 2013;Yang, Geng, Wang, Zhang, & Guo, 2018). The Mongolian Altai consists mainly of the eastern extension of the Altai-Mongolian Terrane and the Gobi Altai arc-related terranes, and they are juxtaposed along the WNW-ESE striking Irtysh-Bulgen tectonic zone (Hong et al, 2017;Wilhem, Windley, & Stampfli, 2012).…”

Section: Geological Backgroundmentioning

confidence: 99%

Late Palaeozoic magmatism in the eastern Tseel Terrane of SW Mongolia evidenced by chronological and geochemical data

Hong

Gao

et al. 2020

Geological Journal

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The eastern Tseel Terrane of SW Mongolia, which is an important part of the Central Asian Orogenic Belt (CAOB), contains a segment of imbricated sheets of Late Palaeozoic granites as well as a bimodal volcanic suite. Late Devonian (380-382 Ma) granites that are enriched in Th, U, and K and depleted in Nb, Ta, P, Ba, Sr, and Ti indicate arc magmatism and are low-K tholeiitic to medium-K calc-alkaline series. Zircon εHf(t) values are of +8.30 to +14.1, with crustal model ages of 0.83-0.48 Ga. The bimodal volcanic suite is composed of N-MORB basalt and 302 ± 2 Ma rhyolite having A 2 -type granite affinities, εHf(t) values ranging from +9.9 to +11.9, and crustal model ages from 0.69 to 0.59 Ga. The rhyolite mighthave originated from partial melting of juvenile lower crust, rather than fractional crystallization of coeval basaltic magma. Late Carboniferous (299-303 Ma) granites are medium-K to high-K calc-alkaline series, crosscutting carbonaceous siltstone, emplaced into the deformed volcanic rocks and are characterized by enrichment in K, Th, and U accompanied by depletion in Ba, Nb, Ta, Sr, P, and Ti in a primitive mantle-normalized diagram with εHf(t) values ranging from +6.05 to +10.6 and crustal model ages from 0.70 to 0.65 Ga. Thus, LA-ICP-MS zircon ages in combination with geochemical data document a phase of arc-related magmatism in the Tseel Terrane at 380-382 Ma. These rocks were subsequently deformed under low-grade metamorphic conditions and intruded by undeformed granites at c. 299-303 Ma. The coeval 302 Ma rhyolite in bimodal volcanic suite shows typical A 2 -type granitic geochemical affinities and probably documents a back-arc basin extensional environment, which was probably related to the roll-back of the Palaeo-Asian Oceanic Plate during the northward subduction under the Central Mongolia microcontinent.

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The tectonic evolution of the Irtysh tectonic belt: New zircon U–Pb ages of arc-related and collisional granitoids in the Kalaxiangar tectonic belt, NW China

Cited by 39 publications

References 74 publications

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

Timing of the final closure of the Irtysh–Zaysan Ocean: New insights from the earliest stitching pluton in the northern West Junggar, NW China

Late Palaeozoic magmatism in the eastern Tseel Terrane of SW Mongolia evidenced by chronological and geochemical data

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