Origin and geodynamic significance of the early Mesozoic Weiya LP and HT granulites from the Chinese Eastern Tianshan

Mao, Ling-Juan; He, Zhenyu; Zhang, Zeming; Klemd, Reiner; Xiang, Hua; Zhang, Tian; Zong, Keqing

doi:10.1016/j.lithos.2015.10.016

Cited by 17 publications

(16 citation statements)

References 66 publications

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“…In addition, the final closure of the North Tianshan Ocean was probably in the Latest Permian–Early Triassic, which was marked by the collision between the Dananhu arc and the Yamansu–Central Tianshan arc along the Kangurtag belt (Figure b; Chen et al, , ). This geodynamic model is rather consistent with intensive Triassic (250–227 Ma) magmatisms in the CTM (Deng et al, ; Lei et al, ; Wu, Zhang, Gu, Tang, & Lei, ; Zhang et al, ; Zhang et al, ; Zhao et al, ), which were accompanied by synchronous contact metamorphism and regional tectonic activities, such as the ~247–244 Ma Weiya high‐temperature, low‐pressure granulites (Mao et al, ) and the ~240–235 Ma Xingxingxia sinistral fault (Wang, Sun, & Li, ; Zhang & Cunningham, ). This Triassic magmatic–metamorphic event was probably related to the post‐collisional stage after the closure of the North Tianshan Ocean (Figure b; Chen et al, , ; Mao et al, ; Xiao et al, ; Xiao, Huang, Han, Sun, & Li, ).…”

Section: Discussionsupporting

confidence: 72%

“…This geodynamic model is rather consistent with intensive Triassic (250-227 Ma) magmatisms in the CTM (Deng et al, 2017;Lei et al, 2013;Wu, Zhang, Gu, Tang, & Lei, 2010;Zhang et al, 2005;Zhang et al, 2017;Zhao et al, 2017), which were accompanied by synchronous contact metamorphism and regional tectonic activities, such as the~247-244 Ma Weiya high-temperature, low-pressure granulites (Mao et al, 2015) and the~240-235 Ma Xingxingxia sinistral fault (Wang, Sun, & Li, 2010;Zhang & Cunningham, 2012). This Triassic magmatic-metamorphic event was probably related to the postcollisional stage after the closure of the North Tianshan Ocean (Figure 13b; Chen et al, 2019aChen et al, , 2019bMao et al, 2015;Xiao et al, 2009;Xiao, Huang, Han, Sun, & Li, 2010). Hf isotopic characteristics indicate that the magmas were probably derived by the mixing of mantle-and crustal-derived magmas.…”

Section: Implications For the Late Carboniferous Tectonic And Crustsupporting

confidence: 75%

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Late Carboniferous crustal evolution of the Chinese Central Tianshan microcontinent: Insights from zircon U–Pb and Hf isotopes of granites

Wen

2020

Geological Journal

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The Central Tianshan microcontinent (CTM) in the southern Central Asian Orogenic Belt is characterized by Precambrian crustal basements and widespread Palaeozoic granitic rocks. However, the Palaeozoic tectonic process and associated crustal evolution of the CTM have not been well constrained. In this paper, we report whole‐rock geochemistry, zircon U–Pb ages, Hf isotopes, and trace elements for the Late Carboniferous granodiorite and monzogranite from the Hongliujingbei area of the eastern CTM. These data were further integrated with previously published whole‐rock geochemistry and zircon Hf isotopic data of the intensive Late Carboniferous (327–300 Ma) magmatic rocks in the CTM in order to gain more insights into the crustal and tectonic evolution of the CTM during the Late Carboniferous. LA‐ICP‐MS zircon U–Pb dating results indicate that the granodiorite and monzogranite from the Hongliujingbei area were emplaced at ~320 Ma. Their highly variable zircon εHf(t) values (−0.1 to +12.9) suggest that the magmas of these rocks were formed by the mixing of mantle‐ and crustal‐derived magmas. The Late Carboniferous magmatic rocks from the CTM, as a whole, show a wide range of zircon εHf(t) values (−3.7 to +13.4) and geochemical characteristics typical for magma evolution in an active continental margin setting. Therefore, we suggest that the Late Carboniferous magmatic rocks in the CTM were probably generated in a continental arc formed by the southward subduction of the North Tianshan Ocean Plate beneath the CTM, and their mostly depleted zircon Hf isotopic compositions indicate that juvenile crustal growth was a dominant process in the CTM during the Late Carboniferous.

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Section: Discussionsupporting

confidence: 72%

Section: Implications For the Late Carboniferous Tectonic And Crustsupporting

confidence: 75%

Late Carboniferous crustal evolution of the Chinese Central Tianshan microcontinent: Insights from zircon U–Pb and Hf isotopes of granites

Wen

2020

Geological Journal

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“…The mixing between the Angaran and Cathaysian floras occurred during the Late Permian–Middle Triassic (Shen et al, ). Youngest Triassic metamorphic events were not found around the Liuyuan Basin; 244 ± 1 Ma to 237 ± 3 Ma granulite‐facies metamorphism was discovered in the Weiya area which is only 150 km northwest of our study area in the Beishan region (Mao et al, ). A previous study suggested that the Weiya granulites were formed by regional metamorphism (Shu et al, ); however, Mao et al () presented that these granulites were the product of a contact metamorphic event in a post‐orogenic tectonic setting.…”

Section: Discussionmentioning

confidence: 70%

An Andean‐type arc transferred into a Japanese‐type arc at final closure stage of the Palaeo‐Asian Ocean in the southernmost of Altaïds

Tian

Xiao

2019

Geological Journal

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Permian progressive accretion or continental rift is a long‐term debate topic in the final evolution of the Altaïds or the Central Asian Orogenic Belt (CAOB). The Beishan orogenic collage in the southernmost part of the CAOB recorded the ultimate closure of the Palaeo‐Asian Ocean. In this paper, we present (a) field structural measurements/data or observations and fold geological maps in the Liuyuan Basin, (b) geochronological results to rocks on the Shibanshan arc and in the Liuyuan Basin, and (c) geochronological and regional geological data collected around the Liuyuan area, in order to investigate the tectonic setting and evolution of the Liuyuan Basin, and finally discuss the termination of the Palaeo‐Asian Ocean. We notice that (a) rocks cropping out on both sides of the Liuyuan Basin have similar petrological and geochronological feature, which are probably from one ancient terrane, (b) sediments and volcanic rocks in the Liuyuan Basin formed in an arc‐related basin within an extensional deep to semi‐deep water setting or in a limited oceanic basin, and (c) at least two stages of folding could be recognized in the Liuyuan Basin; the age of this progressive deformation was constrained by the maximum depositional age of basinal sediments and undeformed or weakly deformed stitching plutons, which is variable from 275 to 217 Ma; orogenesis therefore was related to arc‐related accretion rather than a rift open‐close process in Late Permian to Early Triassic. Finally, we conclude that (a) the Liuyuan Basin is a back‐arc basin, not a rift basin or lake, (b) final closure of the Palaeo‐Asian Ocean was from Late Permian to Triassic, and (3) an Andean‐type arc transferred into a Japanese‐type arc at the final closure of the Palaeo‐Asian Ocean in the southernmost part of the CAOB. Last but not the least, we further speculate that eclogites developed in the Shibanshan arc were emplaced to the Beishan orogenic collage via a destroyed back‐arc basin.

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“…390 Ma high-temperature (HT) metamorphic event (P. F. Li et al, 2020; L. J. Mao et al, 2015;Shu et al, 2004;, whereas the western part preserves ca. 320 Ma eclogites and blueschists suggesting (ultra)high-pressure ((U)HP) subduction related event (J.…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

Silurian‐Devonian Lithospheric Thinning and Thermally Softening Along the Northern Margin of the Tarim Craton: Geological Mapping, Petro‐Structural Analysis and Geochronological Constraints

Ning,

Jiang,

Schulmann

et al. 2023

Tectonics

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While the western part of northern Tarim Craton has long been considered as a Paleozoic passive margin, a pronounced Silurian‐Devonian magmatism developed on eastern part of this margin may indicate different but active margin setting. In this contribution, detailed structural mapping, petro‐structural analysis, and geochronological investigations were conducted in the Korla area, eastern part of northern Tarim Craton. Three main generations of fabrics were recognized. The earliest pervasive fabric is an originally sub‐horizontal metamorphic S1 foliation that is in part associated with migmatization characterized by high temperature/low pressure metamorphic mineral assemblages, interpreted as reflecting crustal extension. S1 foliation was affected by D2 contraction forming regional‐scale F2 upright folds associated with sub‐vertical axial planar foliation S2. D3 is marked by development of NW‐SE oriented dextral fault, asymmetric mega‐folding of S2 and spaced NW‐SE‐striking S3 foliation, likely in response to dextral transpression. Geochronological data indicate that D1 extension occurred from ca. 420 Ma to 410 Ma, D2 contraction started around 410 Ma and lasted till 400 Ma or later, and D3 transpression was ongoing around ∼370 Ma. Integrated with regional data, an updated geodynamic model is proposed by interpreting the Central Tianshan, South Tianshan and NE Tarim Craton as an early Paleozoic supra‐subduction system. We suggest that the Silurian‐Devonian event reflects thermal softening and horizontal stretching of the supra‐subduction crust, resulting in drifting of the Central Tianshan continental arc from the proto Tarim Craton in association with opening of the South Tianshan back‐arc basin in‐between.This article is protected by copyright. All rights reserved.

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Origin and geodynamic significance of the early Mesozoic Weiya LP and HT granulites from the Chinese Eastern Tianshan

Cited by 17 publications

References 66 publications

Late Carboniferous crustal evolution of the Chinese Central Tianshan microcontinent: Insights from zircon U–Pb and Hf isotopes of granites

Late Carboniferous crustal evolution of the Chinese Central Tianshan microcontinent: Insights from zircon U–Pb and Hf isotopes of granites

An Andean‐type arc transferred into a Japanese‐type arc at final closure stage of the Palaeo‐Asian Ocean in the southernmost of Altaïds

Silurian‐Devonian Lithospheric Thinning and Thermally Softening Along the Northern Margin of the Tarim Craton: Geological Mapping, Petro‐Structural Analysis and Geochronological Constraints

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