| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
WU Hao, XU Zuyang, YAN Weibing, HAO Yujie, LIU Haiyong. 2023. Zircon U-Pb ages and geochemical characteristics of diabase in Nie'erco area, central Tibet: Implication for Neo-Tethyan slab breakoff[J]. Geology in China, 50(6): 1804-1816. doi: 10.12029/gc20200709002
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Zircon U-Pb ages and geochemical characteristics of diabase in Nie'erco area, central Tibet: Implication for Neo-Tethyan slab breakoff
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Abstract
This paper is the result of geological survey engineering.
Objective Mantle-derived magmatism generally provided an ideal research object to reveal the geodynamic evolution in the depth. The mafic dikes, which shown intensive distribution in Nie'erco area of central Tibet, are regarded as a key aspect to understanding the regional tectono-magmatic evolution.
Methods In this paper, we report geochronological and geochemical data of the diabases in the Nie'erco area.
Results The zircon U-Pb dating yielded magmatic crystallization ages of (50.8 ±0.6) Ma, indicating the Nie'erco diabases emplacement in the early Eocene. The diabase samples have low SiO2, high MgO, Al2O3, TiO2 and total alkali (Na2O+K2O) contents, similar to alkaline ocean island basalt (OIB). These geochemical features suggest that the studied diabases were generated by partial melting of asthenosphere, with the involvement of continental crustal components.
Conclusions Combined with the post-collisional Linzizong volcanic rocks and OIB-like mafic rocks in southern Tibet, we prefer that the Cenozoic magmatism in Tibet is mainly controlled by the northward subduction of the Neo-Tethyan ocean and the following continent collision between India and Eurasia plates. Our research favor that the Nie'erco diabases were generated in response to the slab breakoff and related upwelling and decompressional melting of sub-slab asthenosphere.
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Keywords:
- zircon U-Pb age /
- diabase /
- Eocene /
- Neo-Tethys /
- slab breakoff /
- geological survey engineering /
- Nie'erco /
- Tibet
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WU Hao, XU Zuyang, YAN Weibing, HAO Yujie, LIU Haiyong. 2023. Zircon U-Pb ages and geochemical characteristics of diabase in Nie'erco area, central Tibet: Implication for Neo-Tethyan slab breakoff[J]. Geology in China, 50(6): 1804-1816. doi: 10.12029/gc20200709002
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Figure 1.
Tectonic subdivision of the southern Tibetan Plateau (a) and simplified geological map of the Nie'erco area and samples location (b)
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Figure 2.
Field and petrographic photographs of Nie'erco diabase
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Figure 3.
Zircon U-Pb concordia diagrams of diabase
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Figure 4.
Nb/Y-Zr/TiO2 diagram (a, after Pearce, 1996) and SiO2-(Na2O+K2O) diagram (b) (Data is from D'Orazio et al., 2001; Gorring et al., 2003; Espinoza et al., 2005; Ji et al., 2016; Wu et al., 2019a)
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Figure 5.
Chondrite-normalized rare earth element patterns (a) and primitive mantle-normalized trace element spider diagrams (b) (the average of OIB, E-MORB, N-MORB and normalized values of REE and trace elements are from Sun and McDonough (1989), other cited data is the same as Fig. 4)
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Figure 6.
(La/Nb)N-(Th/Nb)N diagram (a, after Frey et al., 2002) and Nb/U-Nd/Pb diagram (b, after Ji et al., 2016) (the cited data is the same as Fig. 4)
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Figure 7.
Ti-V diagram (a, after Shervais, 1982) and TiO2-MnO-P2O5 diagram (b, after Mullen, 1983) (the cited data is the same as Fig. 4)
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Figure 8.
Zr-Zr/Y diagram (a, after Pearce and Norry, 1979) and Nb×2-Zr/4-Y diagram (b, after Meschede, 1986) (the cited data is the same as Fig. 4)
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Figure 9.
Schematic illustration of the Eocene tectonic-magmatic evolution of the Tibetan Plateau