The youngest matrix of 234 Ma of the Kanguer accretionary mélange containing blocks of N-MORB basalts: constraints on the northward subduction of the Paleo-Asian Kanguer Ocean in the Eastern Tianshan of the Southern Altaids

Ao, Songjian; Mao, Qigui; Windley, Brian F.; Song, Dongfang; Zhang, Zhiyong; Zhang, Jien; Wan, Bo; Han, Chunming; Xiao, Wenjiao

doi:10.1007/s00531-021-01990-5

Cited by 42 publications

(57 citation statements)

References 78 publications

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“…The collision between the Dananhu arc and the Yamansu-Central Tianshan arc occurred in latest Carboniferous to early Permian time (Xiao et al 2004;Zhang et al 2010). However, recent research constrained the closure of the North Tianshan Ocean to the latest Permian -Early Triassic (Chen, Z et al 2020), or even later in the Middle-Late Triassic (Ao et al 2021).…”

Section: Geological Settingmentioning

confidence: 99%

“…These magmatic events suggest that the Jueluotage area experienced strong tectonic activity during the Triassic period. The maximum depositional ages of sandstone from the mélange matrix in the KDSZ and a marked change of provenance of the Dananhu arc and Yamansu-Central Tianshan arc constrained the closure of the North Tianshan Ocean to Permian-Early Triassic (Chen, Z et al 2020) and Middle-Late Triassic (Ao et al 2021) times. In late Permian and Early Triassic times, thermal subsidence in the Tuha Basin took place and reflects uplift and magmatic activity in the Jueluotage area (Shao et al 1999;Greene et al 2001).…”

Section: A Triassic-early Jurassic Coolingmentioning

confidence: 99%

“…the collision event, Triassic cooling in the Jueluotage area was likely induced by the closure of the North Tianshan Ocean (Chen, Z et al 2020;Ao et al 2021;Fig. 6a, b).…”

Section: A Triassic-early Jurassic Coolingmentioning

confidence: 99%

“…As a branch of the Palaeo-Asian Ocean, the youngest closure time of the North Tianshan Ocean indicates that final amalgamation of the Palaeo-Asian Ocean occurred in Middle-Late Triassic times (Xiao et al 2015(Xiao et al , 2018Ao et al 2021;Mao et al 2021). Several stratigraphic and low-temperature thermochronological studies have recorded closure of the Palaeo-Asian Ocean.…”

Section: A Triassic-early Jurassic Coolingmentioning

confidence: 99%

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Mesozoic exhumation of the Jueluotage area, Eastern Tianshan, NW China: constraints from (U–Th)/He and fission-track thermochronology

et al. 2021

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The Jueluotage area, which is located in the southern branch of the Eastern Tianshan and northeast of the Tarim Basin, represents a vital locality for investigating intracontinental reactivation induced by the tectonic events at the Eurasian plate margin. This study applies zircon and apatite (U–Th)/He and apatite fission-track thermochronology to the Jueluotage area in the Eastern Tianshan. Our data and thermal history modelling show that the Jueluotage area experienced Triassic–Early Jurassic (˜240–180 Ma) cooling, reflecting the closure of the North Tianshan Ocean and subsequent far-field effects of collision/accretion of the Qiangtang Block and Kunlun terrane. Following this period of fast cooling, a differential exhumation process occurred between the various tectonic belts in the Jueluotage area. The Aqishan–Yamansu belt was exposed at the surface during the Triassic–Early Jurassic cooling phase and experienced subsequent burial, which continued until Early Cretaceous time when a pulse of exhumation occurred. However, the major fault zones (Kanggurtag ductile shear zone and Aqikkuduk Fault) and Central Tianshan arc have remained tectonically stable since Early Jurassic time. No Cenozoic rapid cooling was recorded by the low-temperature thermochronology results in this study, indicating that much of the Jueluotage area was exhumed to the upper crust in the late Mesozoic period.

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Section: Geological Settingmentioning

confidence: 99%

Section: A Triassic-early Jurassic Coolingmentioning

confidence: 99%

“…the collision event, Triassic cooling in the Jueluotage area was likely induced by the closure of the North Tianshan Ocean (Chen, Z et al 2020;Ao et al 2021;Fig. 6a, b).…”

Section: A Triassic-early Jurassic Coolingmentioning

confidence: 99%

Section: A Triassic-early Jurassic Coolingmentioning

confidence: 99%

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Mesozoic exhumation of the Jueluotage area, Eastern Tianshan, NW China: constraints from (U–Th)/He and fission-track thermochronology

et al. 2021

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“…250 Ma (Didenko et al, 2016). The Kanguer accretionary mélange in East Tianshan contains blocks of MOR basalts in a (youngest) sandstone matrix that yields MDA of ∼234-243 Ma (Ao et al, 2021), and a mélange in central Inner Mongolia contains blueschist-facies tectonic blocks that have protolith of ∼246-235 Ma (Zhang, Wei, & Chu, 2015). Middle Triassic high Sr/Y granitoids along the Solonker suture zone were interpreted as a magmatic response to the termination of accretionary orogenesis of the southern CAOB (S. Li et al, 2016Li et al, , 2017.…”

Section: Timing and Mechanism Of Closure Of The Paleo-asian Oceanmentioning

confidence: 99%

Closure of the Paleo‐Asian Ocean in the Middle‐Late Triassic (Ladinian‐Carnian): Evidence From Provenance Analysis of Retroarc Sediments

Song

Xiao

Windley

et al. 2021

Geophysical Research Letters

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Asia is the largest extant accretionary continent that was constructed by the successive amalgamation of numerous continental blocks, magmatic arcs and subduction-accretion complexes from the Paleozoic to Cenozoic (Şengör, 1985; Şengör et al., 2018). The construction of the Central Asian Orogenic Belt (CAOB) that extends from the Ural Mountains in the west to the Pacific Ocean in the east involved the welding of major cratonic blocks viz. Siberia, Tarim, Alxa, and North China to form proto-Asia at the expense of the Paleo-Asian Ocean (PAO;Schulmann & Paterson, 2011;W. Xiao et al., 2015). Understanding the spatial-temporal evolution of the accretion-collision processes of the CAOB is crucial for reconstruction of the tectonic configuration of northeast Pangea. However, the timing of PAO closure is strongly disputed due to complex structural overprinting during protracted accretionary processes and to poor preservation of syn-orogenic sedimentary records. The proposed time of closure of the PAO ranges widely from Late Devonian to end

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Middle Triassic lower crust‐derived adakitic magmatism: Thickening of the Dananhu intra‐oceanic arc and its implications for arc–arc amalgamation in the Eastern Tianshan (NW China)

Mao

Windley

et al. 2021

Geological Journal

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The timing and mechanism of the closure of the Palaeo-Asian Ocean are problematic and controversial. To help resolve these problems, we report geochronological, geochemical, and isotopic data from mid-Triassic adakitic intrusions in the Eastern Tianshan, NW China. U-Pb dating shows that the adakitic intrusions formed at 243-234 Ma. These mid-Triassic adakitic intrusions are characterized by high Sr/Y and La/Yb ratios, low Yb and Y, and positive ε Nd (t) (+3.12 − +4.71) and low ( 87 Sr/ 86 Sr) i (0.703956-0.704487) values. However, they have high K and low A/NK values (1.16-1.71), relatively low MgO (0.43-1.81 wt%) contents, and Mg # (44-61), low abundances of compatible elements (Cr = 4.09-16.69 ppm, Ni = 2.02-8.03 ppm), which are different from the typical slab-melting adakites. These features indicate that they were derived from the partial melting of the relatively depleted thickened lower crust. Our new geochronological, geochemical, and isotopic data integrated with the established amalgamation of nearby arcs lead us to conclude that the adakitic intrusions were most likely generated by partial melting of the tectonically thickened (>40 km) juvenile Dananhu intra-oceanic arc and, therefore, the Kanguer branch of the Palaeo-Asian Ocean closed since ca. 234 Ma. K E Y W O R D S accretionary orogeny, adakite, Eastern Tianshan, new crustal growth, thickened arc crustal melting Drummond, 1990) are andesitic to rhyolitic, extrusive, and intrusive rocks generated by slab melting in subduction zones. However, the compositions of some adakitic rocks are controversial, leading to alternative mechanisms of generation, for example, partial melting of the tectonically thickened mafic lower crust

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The youngest matrix of 234 Ma of the Kanguer accretionary mélange containing blocks of N-MORB basalts: constraints on the northward subduction of the Paleo-Asian Kanguer Ocean in the Eastern Tianshan of the Southern Altaids

Cited by 42 publications

References 78 publications

Mesozoic exhumation of the Jueluotage area, Eastern Tianshan, NW China: constraints from (U–Th)/He and fission-track thermochronology

Mesozoic exhumation of the Jueluotage area, Eastern Tianshan, NW China: constraints from (U–Th)/He and fission-track thermochronology

Closure of the Paleo‐Asian Ocean in the Middle‐Late Triassic (Ladinian‐Carnian): Evidence From Provenance Analysis of Retroarc Sediments

Middle Triassic lower crust‐derived adakitic magmatism: Thickening of the Dananhu intra‐oceanic arc and its implications for arc–arc amalgamation in the Eastern Tianshan (NW China)

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