The origin and crustal evolution of microcontinents in the Beishan orogen of the southern Central Asian Orogenic Belt

He, Zhenyu; Klemd, Reiner; Yan, Li-Li; Zhang, Zeming

doi:10.1016/j.earscirev.2018.05.012

Cited by 100 publications

(60 citation statements)

References 119 publications

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“…According to our recent data, tectonic zones in the BOC from south to north can be divided into ( Figure 1b consists of granitic gneisses and migmatites, and the ages of which were poorly known until recently studied by many geologists (He, Klemd, Yan, & Zhang, 2018;. The Precambrian basement was previously recognized as the Archean Beishan complex.…”

Section: Geological Settingmentioning

confidence: 97%

“…The Shibanshan arc is located in the northern part of the Dunhuang block (Figure b) and contains an assemblage of Precambrian basement, Palaeozoic sediments (metamorphosed), and multistages of arc‐related magmatic rocks. The Precambrian basement consists of granitic gneisses and migmatites, and the ages of which were poorly known until recently studied by many geologists (He, Klemd, Yan, & Zhang, ; Wang et al, ). The Precambrian basement was previously recognized as the Archean Beishan complex.…”

Section: Geological Settingmentioning

confidence: 99%

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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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Section: Geological Settingmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 99%

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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“…Analyses of the detrital zircons in the metasedimentary samples have revealed a predominant population at 1000–2000 Ma with age peaks around 1130, 1340, 1400–1600, and 1750 Ma (Figure d). Late Paleoproterozoic (~1750 Ma) and Mesoproterozoic (~1400 and ~1340 Ma) detrital zircon populations temporally coincide with the metamafic dyke (~1733 Ma) and magmatism (1458–1402 and 1380 Ma) in the CTB (Figures a, , and d; Hu et al, ; Shi et al, ; He et al, ; He et al, ; Wang et al, ). Additionally, their ε Hf ( t ) values are in agreement with those of the contemporaneous late Paleoproterozoic and Mesoproterozoic magmatic rocks in the CTB (Figures a and b), suggesting that these detrital zircon grains were derived from synchronous igneous rocks in the CTB.…”

Section: Discussionmentioning

confidence: 95%

From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia

et al. 2019

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The transition from breakup of Nuna (or Columbia, 2.0-1.6 Ga) to assembly of Rodinia (1.0-0.9 Ga) is investigated by means of U-Pb and Lu-Hf data of detrital zircons from three Neoproterozoic metasedimentary rocks in the Central Tianshan Block (CTB), NW China. These data yield six age peaks around 1.0, 1.13, 1.34, 1.4-1.6, 1.75, and 2.6 Ga. Few zircons are detected between 2.0 and 2.5 Ga. The Paleoproterozoic to Neoproterozoic detrital zircons have Hf isotopic compositions (−22.1 to +13.0) similar to those of coeval magmatic rocks in the CTB, indicating a proximal provenance. These results, together with the geological evidence and the presence of 1.4 Ga orogenic granitoids in the CTB, rule out most cratons as the CTB sources but support a Fennoscandia ancestry. Zircon U-Pb ages and Hf isotopic compositions from the CTB and Fennoscandia suggest that from 1.8 to 1.4 Ga, the ε Hf (t) values increased toward more positive values, consistent with an exterior orogen characteristic that the lower crust was replaced by a juvenile arc crust. In contrast, from 1.4 to 0.9 Ga, zircon ε Hf (t) values decreased to more negative values, reflecting an interior orogen, characterized by enhanced contribution of recycled crustal material from collided continental fragments. This marked shift most likely reflected a transition from breakup of Nuna to assembly of Rodinia, accomplished by a transformation from an exterior orogen to an interior one.

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“…Among several tectonic units in the Chinese Eastern Tianshan, the Central Tianshan is a microcontinental terrane characterized by Precambrian crustal basements (He et al, ; Hu, Jahn, Zhang, Chen, & Zhang, ; Liu, Guo, Zhang, Li, & Zheng, ). The Mesoproterozoic juvenile crustal growth has been well documented and provided robust evidence for the microcontinental nature of the Central Tianshan (He et al, ; He, Klemd, Yan, Lu, & Zhang, ; He, Klemd, Yan, & Zhang, ). Recently, intensive Palaeozoic granitic rocks have been recognized from the Central Tianshan microcontinent (CTM).…”

Section: Introductionmentioning

confidence: 99%

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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The origin and crustal evolution of microcontinents in the Beishan orogen of the southern Central Asian Orogenic Belt

Cited by 100 publications

References 119 publications

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

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

From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia

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

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