拉萨地体南缘早始新世荣玛辉长岩年代学、岩石地球化学特征及其地质意义

董咪; 郎兴海; 邓煜霖; 王旭辉

doi:10.3799/dqkx.2021.137

Volume 47 Issue 4

Apr. 2022

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Article Navigation > Earth Science > 2022 > 47(4): 1349-1370

Dong Mi, Lang Xinghai, Deng Yulin, Wang Xuhui, 2022. Geochronology and Geochemistry Implications for Early Eocene Rongma Gabbros in Southern Margin of Lhasa Terrane, Tibet. Earth Science, 47(4): 1349-1370. doi: 10.3799/dqkx.2021.137

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Dong Mi, Lang Xinghai, Deng Yulin, Wang Xuhui, 2022. Geochronology and Geochemistry Implications for Early Eocene Rongma Gabbros in Southern Margin of Lhasa Terrane, Tibet. Earth Science, 47(4): 1349-1370. doi: 10.3799/dqkx.2021.137

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Geochronology and Geochemistry Implications for Early Eocene Rongma Gabbros in Southern Margin of Lhasa Terrane, Tibet

doi: 10.3799/dqkx.2021.137

College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2021-06-20
Available Online: 2022-04-29
Publish Date: 2022-04-25

Abstract

Abstract

The slab breakoff of the Neo-Tethys Ocean after the initial India-Asia collisional has not been well constrained up to now. In this paper, zircon U-Pb dating, whole rock major and trace element and Sr-Nd isotopes analysis of the Early Eocene gabbros in the Rongma area on the southern margin of the Lhasa terrane have been carried out, the petrogenesis and geodynamical implication are discussed to further constrain the slab breakoff of the Neo-Tethyan oceanic slab.The results show that zircon U-Pb ages of 51±1 Ma have been obtained for Rongma gabbros, indicating they were formed in the Early Eocene.The Rongma gabbros are enriched in LILEs (such as Rb, Sr, Ba) and depleted in HFSEs (such as Nb, Ta, Ti) with initial ⁸⁷Sr/⁸⁶Sr=0.705 9-0.706 6 and ε_Nd(t)=+3.1-+3.3. Compared with typical arc magmas, the Rongma gabbros have high contents of Zr (134.28×10^-6-230.07×10^-6), TiO₂(1.04%-1.51%) and Nb (9.01×10^-6-14.67×10^-6), suggesting a geochemical intraplate-affinity. In addition, Rongma gabbros were derived from depleted lithospheric mantle which metasomatized by slab-derived fluids during Neo-Tethyan subduction, accompanied with significant contributions from deep asthenosphere mantle.Combined with the geochemical and geochronological data of the Cenozoic magmatic rocks from the southern Lhasa terrane, it further proposes that slab breakoff of the Neo-Tethys Ocean has occurred before 51 Ma.
- Early Eocene,
- southern Lhasa terrane,
- gabbro,
- slab breakoff,
- Neo-Tethys Ocean,
- geochemistry

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Geochronology and Geochemistry Implications for Early Eocene Rongma Gabbros in Southern Margin of Lhasa Terrane, Tibet

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