| Citation: |
Shi-mian Yu, Xu-dong Ma, Yan-chun Hu, Wei Chen, Qing-ping Liu, Yang Song, Ju-xing Tang, 2022. Post-subdution evolution of the Northern Lhasa Terrane, Tibet: Constraints from geochemical anomalies, chronology and petrogeochemistry, China Geology, 5, 84-95. doi: 10.31035/cg2021045
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Post-subdution evolution of the Northern Lhasa Terrane, Tibet: Constraints from geochemical anomalies, chronology and petrogeochemistry
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Abstract
Bangong-Nujiang collisional zone (BNCZ) is an older one in Qinghai-Tibet Plateau and resulted in the famous Bangong-Nujiang metallogenic belt, which plays an important role in evaluating the formation and uplift mechanism of plateau. The northern and central Lhasa Terrane composed the southern part of the BNCZ. Since ore deposits can be used as markers of geodynamic evolution, the authors carried 1∶50000 stream sedimental geochemical exploration in the Xiongmei area in the Northern Lhasa Terrane to manifest the mineralization, and based on this mineralization with geochemical and chronological characteristics of related magmatic rocks to constrain their geodynamics and connection with the evolution of the Lhasa Terrane. The authors find Early Cretaceous magma mainly resulted in Cu, Mo mineralization, Late Cretaceous magma mainly resulted in Cu, Mo, and W mineralization in the studying area. The results suggest a southward subduction, slab rolling back and break-off, and thickened lithosphere delamination successively occurred within the Northern Lhasa Terrane.
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References
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Shi-mian Yu, Xu-dong Ma, Yan-chun Hu, Wei Chen, Qing-ping Liu, Yang Song, Ju-xing Tang, 2022. Post-subdution evolution of the Northern Lhasa Terrane, Tibet: Constraints from geochemical anomalies, chronology and petrogeochemistry, China Geology, 5, 84-95. doi: 10.31035/cg2021045
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Figure 1.
Tectonic framework of the Tibetan Plateau showing the studying area (Modified from Yin A and Harrison TM, 2000; Zhu DC et al., 2016; Tang JX et al., 2021).
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Figure 2.
Distribution map of the magmatic rocks and geochemical element anomalies in the studying area.
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Figure 3.
Zircon 206Pb/207Pb age vs. εHf(t) values diagram for the magmatic rocks.
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Figure 4.
Some discrimination diagrams for the magmatic rocks.
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Figure 5.
Chondrite-normalized REE diagrams and primitive mantle (PM) normalized trace element diagrams. The scope for the Gangdese and Andean are modified from Zhu XS et al., 2017.
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Figure 6.
a–Sr/Y vs. Y and b–(La/Yb)N vs. YbN diagrams.
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Figure 7.
Schematic illustration shows the geodynamic evolution of the NLT.