Detrital zircon ages, sources, and implications of the Tangwangling Group, southern margin of the Ordos Block, western North China Craton.

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Date: Apr. 2021
From: Geosciences Journal(Vol. 25, Issue 2)
Publisher: Springer
Document Type: Report
Length: 403 words

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Keywords: southern Ordos Block; North China Craton; North Qinling Terrain; Tangwangling Group; detrital zircon; U-Pb dating Abstract The southern margin of the Ordos Block (S-OB) is located in the western part of the southern region of the North China Craton (S-NCC), and has been involved in multiple orogenic episodes that uplifted the North Qinling Orogenic Belt (NQB). Determining whether the S-OB deposits and sources were controlled by late Precambrian or Ordovician tectonic sedimentation is extremely important for understanding the paleo-tectonic evolution of the S-NCC and its relationship with the North Qinling Terrane (NQT). In this study, the depositional age and trace of the source area of the Tangwangling Group (TWL) were constrained using detrital zircon U-Pb isotopic analyses. Six sandstone samples collected from the TWL Group yielded similar detrital zircon age patterns, with four distinct clusters at 2588-2305 Ma, 2100-1600 Ma, 1251-1005 Ma 995-744Ma which correspond to peak ages of 2.45 Ga, 1.80 Ga, 1.10 Ga, and 0.82 Ga, respectively. The youngest zircon ages that peak at 0.82 Ga suggest that the depositional age of the TWL Group is the closest to the late Neoproterozoic, based on comparisons with geochronological data from late Precambrian and Ordovician successions that outcrop in the OB. The detrital zircon age ranges of the TWL Group, in comparison with those of the NCC and NQT, also indicate that clastic grains deposited in the TWL Group were mainly sourced from NCC basement rocks and less so from the late Precambrian NQT complex, which was coincident with a Grenvillian-aged tectonomagmatic event. Thus, we conclude that the NQT had accreted onto the S-NCC before the TWL Group were deposited during the late Neoproterozoic, implying that the S-NCC or the S-OB may have experienced or was at least influenced by the assembly and breakup of Rodinia. Author Affiliation: (1) State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, 229 North Taibai road, 710069, Xi'an, China (2) School of Earth Science and Resources, Chang'an University, 710054, Xi'an, China (3) Key Lab of coal Resources Exploration and Comprehensive Utilization, The Ministry of Land and Resources (MLR), 710021, Xi'an, China (4) Northwest Branch of Research Institute of Petroleum Exploration and Development, PetroChina, 730020, Lanzhou, China (b) Chengang@nwu.edu.cn Article History: Registration Date: 06/25/2020 Received Date: 11/30/2019 Accepted Date: 03/21/2020 Online Date: 06/26/2020 Byline: Yu Kang (1), Gang Chen (corresponding author) (1, b), Qiang Chen (2), Fu Yang (3), Junping Huang (4), Xiaoyu Xia (1)

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Gale Document Number: GALE|A654818584