Ages and tectonic implications of Neoproterozoic ortho- and paragneisses in the Beishan Orogenic Belt, China

Liu, Qian; Zhao, Guochun; Sun, Min; Eizenhöfer, Paul R.; Han, Ying‐Feng; Hou, Wenzhu; Zhang, Xiaoran; Wang, Bo; Liu, Dongxing; Xu, Bing

doi:10.1016/j.precamres.2015.05.022

Cited by 79 publications

(38 citation statements)

References 132 publications

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“…1.0–0.9 Ga) in the CTB (Figures a, , and d). In addition, their negative ε Hf ( t ) values are almost indistinguishable from those of the coeval granitoids in the CTB (Figures a and b; Gao et al, ; Huang, Long, et al, ; Huang et al, ; Huang et al, ; Liu et al, ; Wang, Han, et al, ). These similarities suggest that the early Neoproterozoic detrital zircons are of a proximal igneous provenance, probably in or near the CTB.…”

Section: Discussionmentioning

confidence: 90%

“…(a) Diagram of ε Hf ( t ) value versus age for detrital zircons from this study, Yili Block (Huang et al, ) , Fennocandia (Bingen et al, ; Spencer et al, ), and west Laurentia (Howard et al, ; Mulder et al, ; Spencer et al, ; Wooden et al, ). (b) Diagram of ε Hf ( t ) value versus age for magmatic zircons from the Chinese CTB and Yili Block (Gao et al, ; He et al, ; He, Zhang, Zong, Xiang, et al, ; Huang et al, ; Huang et al, ; Huang, He, et al, ; Huang, Long, et al, ; Liu et al, ; Wang et al, ; Wang, Han, et al, ) and Fennoscandia (Roberts et al, ; Spencer et al, ; Roberts & Slagstad, , and references therein; Johansson et al, ). Note that all the data recalculated by using the same parameters that were mentioned in the analytical methods.…”

Section: Resultsmentioning

confidence: 99%

“…The origin of the CTB is still unclear. One school of thought argued that the CTB was part of a continental margin arc developing on the northern margin of the Tarim Craton during the Paleozoic and was later fragmented away from the Tarim Craton with the opening of the South Tianshan Ocean (Han et al, ; Han & Zhao, ; Lei et al, ; Liu et al, ; Ma et al, ; Ma, Shu, Jahn, et al, ; Ma, Shu, Santosh, & Li, ; Shu et al, ; Wang et al, ; Wang, Gao, et al, ; Wang, Han, et al, ; Zhang et al, , , ). Based on the studies about Meso‐Neoproterozoic tectonothermal events in the CTB (1.4, 1.0–0.9, and 0.8–0.7 Ga; He, Zhang, Zong, Xiang, et al, ; He et al, ; He et al, ; Huang et al, , Huang, He, et al, ; Huang et al, ), however, some workers argue against a Tarim Craton origin but propose a connection with the Baltica (He et al, ; He et al, ; He, Zhang, Zong, Xiang, et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The granitoids in the CTB (ca. 1.01 Ga) and Fennoscandia block (1.05–1.03 Ga) were produced in a subduction related environment (Bingen & Van Breemen, ; Liu et al, ; Roberts & Slagstad, ; Slagstad et al, ), and the 0.96–0.93 Ga magmatic rocks in these two blocks implied a subduction erosion with reworking of crustal materials (Huang et al, ; Huang, Long, et al, ; Slagstad et al, ; Vander Auwera et al, ). Metamorphism and deformation in the CTB (0.93–0.90 Ga) and the Fennoscandia (1.03–0.92 Ga) indicate a collisional scenario (Bingen et al, ; He et al, ; Johansson et al, ; Scherstén et al, ; Zong et al, ), which is compatible with the crustal thickening from 1.4 to 0.9 Ga in the CTB (Figure ).…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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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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“…These magmatic rocks, including the mafic dykes intruding the Aksu Group (Xia et al, 2017;Zhang et al, 2009), were initially interpreted to be results of a superplume activity related to the break-up of Rodinia. However, Ge et al (2014) and Liu et al (2015) recently pointed out that evidence of the superplume model is insufficient. Furthermore, He et al (2012) and Ge et al (2013) reported ca.…”

Section: Implications Of the 745-ma Mafic Dykesmentioning

confidence: 99%

⁴⁰Ar/³⁹Ar ages and geological significance of Neoproterozoic–Cambrian mafic rocks in the Aksu–Wushi area, NW Tarim Craton

Zhu

Jourdan

et al. 2018

Geological Journal

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Mafic dyke swarms and continental flood basalts record crucial information on mantle dynamics, crustal palaeostress, and supercontinent cycle. However, these mafic rocks are relatively difficult to date using zircon U–Pb methods because autogenous magmatic zircons are rare or absent in the rapidly cooled mafic magmas and most zircons extracted from these rocks are likely captured from their wall rocks. One good example of this dilemma is the Precambrian mafic dykes and layered basites in the Aksu–Wushi area, NW Tarim Craton, from which abundant zircon U–Pb data have yielded age spectra similar to those of the detrital zircons from the associated (meta‐)sedimentary rocks. In this paper, we performed the first 40Ar/39Ar dating on separated mineral grains from the mafic dykes (plagioclase and amphibole) and layered basites (plagioclase and pyroxene) in this area. Amphiboles from a mafic dyke cross‐cutting the blueschist‐bearing Aksu Group yielded a 40Ar/39Ar plateau age of 744.5 ± 2.8 Ma, whereas pyroxenes from a layered basite within the Sugetbrak Formation yielded a 40Ar/39Ar plateau age of 521.0 ± 2.1 Ma. The 40Ar/39Ar plateau age of 744.5 ± 2.8 was interpreted as the crystallization age of the studied mafic dykes and provides a minimum constraint for the third phase of deformation of the blueschist terrane. The mini‐plateau age of 521.0 ± 2.1 Ma was interpreted as a minimum crystallization age for basite of the Sugetbrak Formation. We also conducted geochemical analyses on layered basites of the Sugetbrak Formation from the Xiaoenbrak Formation, and the results indicated that these layered basites shared a uniform geochemical characteristic. Combining geochronological and geochemical analyses, we propose that the basites of the Sugetbrak Formation probably recorded a rifting event on the north‐western margin of the Tarim Craton during Early Cambrian.

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Ordovician to Early Permian accretionary tectonics of Eastern Tianshan: Insights from Kawabulak ophiolitic mélange, granitoid, and granitic gneiss

Xiao

Windley

et al. 2018

Geological Journal

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There is a broad consensus that the final closure of the Paleo-Asian Ocean lead to the formation of the southern segment of the Central Asian Orogenic Belt. However, the final closure of the Paleo-Asian Ocean remains controversial. To address this issue, a systematical study of geochemical and zircon U-Pb on the Kawabulak ophiolite in the southern Eastern Tianshan was carried out. The Kawabulak ophiolite is an accretionary prism that consists of different lithological tectonic slices and marks the suture zone that welded the Central Tianshan composite arc and the northern passive margin of the Tarim Craton. Zircon U-Pb data show that gabbro blocks of the Kawabulak ophiolite formed at 360.9 ± 3.3 Ma in the northern part and 326.0 ± 3.3 Ma in the southern part, respectively. The geochemistry features of basalts and gabbros show OIB-type, arc/subduction-related affinities, indicating different tectonic setting origins. A granitic gneiss with an arc-related geochemical feature yielded a zircon U-Pb age of 477.2 Ma, indicating the earliest subduction event. The youngest deformed arc-related granitic intrusion (295 Ma) in the Kawabulak prism indicates that the final closure timing of the Paleo-Asian Ocean in Eastern Tianshan is after the Early Permian. The results of our study shed light to the temporal and spatial evolution of the southern Central Asian Orogenic Belt.

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Ages and tectonic implications of Neoproterozoic ortho- and paragneisses in the Beishan Orogenic Belt, China

Cited by 79 publications

References 132 publications

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

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

⁴⁰Ar/³⁹Ar ages and geological significance of Neoproterozoic–Cambrian mafic rocks in the Aksu–Wushi area, NW Tarim Craton

Ordovician to Early Permian accretionary tectonics of Eastern Tianshan: Insights from Kawabulak ophiolitic mélange, granitoid, and granitic gneiss

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Ages and tectonic implications of Neoproterozoic ortho- and paragneisses in the Beishan Orogenic Belt, China

Cited by 79 publications

References 132 publications

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

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

40Ar/39Ar ages and geological significance of Neoproterozoic–Cambrian mafic rocks in the Aksu–Wushi area, NW Tarim Craton

Ordovician to Early Permian accretionary tectonics of Eastern Tianshan: Insights from Kawabulak ophiolitic mélange, granitoid, and granitic gneiss

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⁴⁰Ar/³⁹Ar ages and geological significance of Neoproterozoic–Cambrian mafic rocks in the Aksu–Wushi area, NW Tarim Craton