| Citation: |
Sen Wang, Hong-jie Qu, Shuan-hong Zhang, Huan Wang, Meng-ying Cai, Ge-xue Zhao, 2025. Geochronology, petrogenesis, and tectonic characteristics of a volcanic–intrusive complex on the northern margin of North China Craton and its limitation on the closing time of the Paleo-Asian Ocean (245 Ma), China Geology, 8, 373-388. doi: 10.31035/cg2023090
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Geochronology, petrogenesis, and tectonic characteristics of a volcanic–intrusive complex on the northern margin of North China Craton and its limitation on the closing time of the Paleo-Asian Ocean (245 Ma)
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Abstract
The Central Asian Orogenic Belt (CAOB) is one of the largest and best preserved accretionary type orogenic belts in the world. Due to its complex tectonic history, the timing and location of the final closure of the Paleo-Asian Ocean and its tectonic evolution have been hotly discussed. To determine the petrogenesis and tectonic characteristics of the poorly exposed Triassic volcanic-intrusive complex on the northern margin of the eastern North China Craton, the authors conducted a study of zircon Lu-Hf isotopes, integrated with zircon U-Pb dating and whole-rock geochemistry. Zircons from eight representative volcanic and intrusive samples yielded concordant U-Pb ages of 251–245 Ma. The volcanic and intrusive rocks are all characterized by enrichments in large ion lithophile elements and depletions in high field strength elements, and they have features similar to those of highly fractionated I-type granites. The εHf(t) values for the volcanic and intrusive rocks, respectively, range from –1.69 to +3.75 (mean=+1.22) and –2.17 to +3.15 (mean=+0.38), with two-stage model ages of 1035–1345 Ma (mean=1196 Ma) and 1073–1401 Ma (mean=1250 Ma). The Hf isotopic features indicate that these rocks were formed by partial melting of young crustal material that was newly accreted from the depleted mantle, together with a degree of contamination by other crustal material. The volcanic–intrusive complex was related to an active continental margin in a volcanic arc and syn-collisional setting, indicating that the Paleo-Asian Ocean was closed after the Middle Triassic (245 Ma) along the northern margin of the North China Craton. This provides a constraint on the timing of the change in tectonic setting in this area from compression to extension. The results enhance our understanding of the evolution of the Paleo-Asian Ocean.
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References
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Sen Wang, Hong-jie Qu, Shuan-hong Zhang, Huan Wang, Meng-ying Cai, Ge-xue Zhao, 2025. Geochronology, petrogenesis, and tectonic characteristics of a volcanic–intrusive complex on the northern margin of North China Craton and its limitation on the closing time of the Paleo-Asian Ocean (245 Ma), China Geology, 8, 373-388. doi: 10.31035/cg2023090
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Figure 1.
Regional structural location (a) and Triassic magmatic rock distribution map (b) of the eastern segment of the northern margin of the North China Craton area (modified from Xu B et al., 2015).
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Figure 2.
Geological schematic map and sampling location map of the study area.
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Figure 3.
Field and micrographs of the Triassic volcanic and intrusive rocks of the study area.
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Figure 4.
Classification diagrams of the lithochemical compositions for the Triassic volcanic and intrusive rocks of the study area.
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Figure 5.
Chondrite normalized REE patterns (a) and Primitive mantle-normalized trace element spider diagrams (d) for the Triassic volcanic and intrusive rocks in the northern margin of eastern North China craton. Normalized values for chondrite and primitive mantle are from Sun SS and McDonough WF (1989).
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Figure 6.
Cathodoluminescence images of representative zircons from the Triassic volcanic and intrusive rocks.
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Figure 7.
Zircon U-Pb concordia diagrams of the Triassic volcanics (TWD3101, TWD1326, TWD1015 and TK05-TW1) and intrusive rocks (P9-TW2, P4-TW2, ZKM92, TW6109).
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Figure 8.
εHf(t)–t diagram (a) and two-stage model ages (b) of zircons from the Triassic volcanics and intrusive rocks.
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Figure 9.
Geochemical discrimination diagrams for the Triassic volcanics and intrusive rocks from the northern margin of eastern North China craton. The base maps are from Whalen JB et al. (1987). I, S, M and A denote I-, S-, M- and A-type granites respectively. OGT: unfractionated I, S- and M-type granites; FG: fractionated I-type granites.
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Figure 10.
Ta-Th (a) and Y-Th/Ta (b) diagrams (after Schandl ES et al., 2002) for the Triassic volcanics and intrusive rocks from the northern margin of eastern North China craton.
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Figure 11.
Tectonic discrimination diagrams for granites (after Pearce JA et al., 1984). VAG‒volcanic arc granite; WPG‒within-plate granite; ROG‒Oceanic ridge granite; Syn-COLG: Syncollisional granite.