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The final closure time of the eastern segment of the Paleo-Asian Ocean: Insights from geochronology and geochemistry of Permian-Triassic sedimentary sequence in Wangqing, Jilin Province, China

Published online by Cambridge University Press:  16 December 2024

Junzhe Yin
Affiliation:
College of Earth Sciences, Jilin University, Changchun, China
Chenyue Liang*
Affiliation:
College of Earth Sciences, Jilin University, Changchun, China Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun, China
Changqing Zheng
Affiliation:
College of Earth Sciences, Jilin University, Changchun, China Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun, China
Zhiwei Song
Affiliation:
College of Earth Sciences, Jilin University, Changchun, China
Xianghe Jia
Affiliation:
College of Earth Sciences, Jilin University, Changchun, China
Long Chen
Affiliation:
College of Earth Sciences, Jilin University, Changchun, China
*
Corresponding author: Chenyue Liang; Email: chenyueliang@jlu.edu.cn
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Abstract

The Central Asian Orogenic Belt is the world’s largest accretionary orogenic belt, associated with the closure of the Paleo-Asian Ocean (PAO). However, the final closure timing of the eastern PAO remains contentious. The Permian-Triassic sedimentary sequences in the Wangqing area along the Changchun-Yanji suture zone offer important clues into this final closure. New data on petrology, whole-rock geochemistry, zircon U-Pb geochronology and zircon Hf isotopes of sedimentary rocks from the Miaoling Formation and Kedao Group in Wangqing area provide new insights into the final closure of the eastern end of the PAO. The maximum deposition ages of the Miaoling Formation and Kedao Group have been constrained to the Late Permian (ca. 253 Ma) and early Middle Triassic (ca. 243 Ma), respectively. These sedimentary rocks exhibit similar geochemical characteristics, showing low textural and compositional maturities, implying short sediment transport, with all detrital zircons suggesting their origins from felsic igneous rocks. The εHf(t) values of the Miaoling Formation range from −6.09 to 12.43 and from −2.20 to 7.59 for the Kedao Group, implying these rocks originated from NE China. Considering our new data along with previously published data, we propose that a reduced remnant ocean remained along the Changchun-Yanji suture zone in the early Middle Triassic (ca. 243 Ma), suggesting the final closure of the eastern PAO likely occurred between the latest Middle Triassic and early Late Triassic.

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Type
Original Article
Creative Commons
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial licence (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original article is properly cited. The written permission of Cambridge University Press must be obtained prior to any commercial use.
Copyright
© The Author(s), 2024. Published by Cambridge University Press
Figure 0

Figure 1. Tectonic sketch map of the Central Asian Orogenic Belt (a; Zhou & Wilde, 2013) and NE China (b; Liu et al. 2017).

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Figure 2. Detailed geological map of the Wangqing area showing the stratigraphic distribution and sampling locations.

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Figure 3. Stratigraphic columns of the study area with sampling locations.

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Figure 4. Field photographs (a-c) and photomicrographs (d-f) of analyzed samples from the Miaoling Formation.

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Figure 5. Field photographs (a-b) and micrographs (c-d) of analyzed samples from the Kedao Group.

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Figure 6. Cathodoluminescence (CL) images of representative detrital zircons from all dated samples. Circles mark dating spots (red for U-Pb isotopic tests, yellow for Hf isotopic tests.). Below zircons refer to the U-Pb ages, above are dating numbers.

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Figure 7. U-Pb concordia diagrams of detrital zircons from the Miaoling Formation; ellipses represent 2σ uncertainties (blue ellipses represent the group of the youngest concordant ages).

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Figure 8. U-Pb concordia diagrams for detrital zircons from the Kedao Group; ellipses represent 2σ uncertainties (blue ellipses represent the group of the youngest concordant ages).

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Figure 9. Geochemical classification diagrams of the Miaoling Formations and Kedao Group (after Pettijohn et al. 1972 and Herron, 1988).

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Figure 10. Chondrite-normalized REE patterns (left) and Primitive Mantle trace element diagrams (right) for the studied sandstones. The normalizing values for REE and trace elements are from McDonough & Sun (1995) and Boynton (1984), respectively. Data for the average upper continental crust are from Rudnick & Gao (2014).

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Figure 11. Hf isotopic compositions of detrital zircons from Miaoling Formation (yellow) and Kedao Group (blue) in the study area (Yang et al. 2006).

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Figure 12. A-CN-K weathering diagram of major elements (after Nesbitt & Young, 1984) in sandstones from the Wangqing area. The solid arrow represents the ideal weathering trend line of each igneous rock, according to data from Condie (1993). A: Al2O3, CN: CaO*+Na2O, K: K2O.

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Figure 13. The fields of zircon compositions used as discriminants for different rock types (Belousova et al. 2002). (a) Zircon Y versus U, (b) Zircon Nb versus Ta, (c) Zircon Y versus Yb/Sm, (d) Zircon Y versus Nb/Ta, (e) Zircon Nb/Hf versus Th/U (Yang et al. 2012) and (f) Zircon Hf/Th versus Th/Nb (Yang et al. 2012).

Figure 13

Figure 14. a-b. Age probability histograms of detrital zircons with concordant ages and the youngest weight mean age from the Kedao Group; c-d. Age probability histograms of detrital zircons with concordant ages and the youngest weight mean ages of the Miaoling Formation; e. The data originate from NE China (Zhangguangcai Range and Jiamusi-Khanka block; data from Du et al. 2016; Meng et al. 2011; Wang et al. 2012, 2015; Yu et al. 2013; Luan et al. 2017; Li, Y. et al. 2017; Long et al. 2019; Xue et al. 2023; Hua et al. 2019; Li, H.D. et al. 2022; Meng et al. 2017; Mou et al. 2023; Pu et al. 2015; Wen et al. 2017; Xiong et al. 2020; Zhang et al. 2021; Zhao et al. 2021; Zhao et al. 2023; Zhou et al.2013). f. The data originate from North China Craton; data from Liu et al. 2020, 2021; Chen et al. 2017, 2020; Fu et al. 2018; Li, G.S. et al. 2022; Liu et al. 2018; Pei et al. 2014; Peng et al. 2020; Peng & Wang, 2018; Shao et al. 2014; Yang et al. 2022; Zhang et al. 2015; Zhang et al. 2022; Zhang et al. 2013).

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Figure 15. Multidimensional scaling (MDS) analysis results of Miaoling Formation, Kedao Group and surrounding potential source areas (NE China and North China Craton). a. After the standard K-S test. b. After the standard Kuiper test. (Vermeesch, 2013).

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Figure 16. Summary plot of the general fields for convergent (A: red field), collisional (B: blue field), and extensional basins (C: greenfield). From the variations observed between the different fields, a model that predicts the tectonic setting of sedimentary packages of unknown origin is proposed based on differences between the crystallization and depositional ages (CA-DA) of the zircons.

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Figure 17. New discriminant-function multidimensional diagram for high-silica (a) and low-silica (b) clastic sediments from three tectonic settings (arc, continental rift and collision) (Verma & Armstrong-Altrin, 2013).

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Figure 18. A sketch of the tectonic evolutionary pattern of the Paleo-Asian Ocean during 253–243Ma.

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