西藏中拉萨地块门巴花岗闪长岩成因及深部动力学过程

王旭辉; 郎兴海; 梁海辉; 杜良艺; 邓煜霖; 何青; 董咪

doi:10.3799/dqkx.2022.167

Volume 49 Issue 2

Feb. 2024

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Wang Xuhui, Lang Xinghai, Liang Haihui, Du Liangyi, Deng Yulin, He Qing, Dong Mi, 2024. Petrogenesis and Geodynamic Processes of the Mamba Granodiorite, Central Lhasa Block, Xizang. Earth Science, 49(2): 577-593. doi: 10.3799/dqkx.2022.167

Citation:

Wang Xuhui, Lang Xinghai, Liang Haihui, Du Liangyi, Deng Yulin, He Qing, Dong Mi, 2024. Petrogenesis and Geodynamic Processes of the Mamba Granodiorite, Central Lhasa Block, Xizang. Earth Science, 49(2): 577-593. doi: 10.3799/dqkx.2022.167

Citation:

Wang Xuhui, Lang Xinghai, Liang Haihui, Du Liangyi, Deng Yulin, He Qing, Dong Mi, 2024. Petrogenesis and Geodynamic Processes of the Mamba Granodiorite, Central Lhasa Block, Xizang. Earth Science, 49(2): 577-593. doi: 10.3799/dqkx.2022.167

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Petrogenesis and Geodynamic Processes of the Mamba Granodiorite, Central Lhasa Block, Xizang

doi: 10.3799/dqkx.2022.167

Wang Xuhui^{1
,
,},
Lang Xinghai^{1
,
,
,},
Liang Haihui²,
Du Liangyi¹,
Deng Yulin¹,
He Qing¹,
Dong Mi¹

1.
College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
2.
East China Metallurgical Geologlcal Prospecting Bureau of Geophysiical Prospecting Team, Wuhu 241000, China

Received Date: 2022-12-27
Publish Date: 2024-02-25

Abstract

Abstract

In order to discuss thedynamic mechanism of Late Cretaceous magmatism in the Lhasa block, this paper carried out petrographic, chronological, geochemical and mineral chemistry studies on the Menba granodiorites in the southern margin of the central Lhasa block. LA-ICP-MS zircon U-Pb dating indicates that the Menba granodiorites emplaced in the Late Cretaceous (83.2 Ma±0.9 Ma). The geochemical characteristics show that the Menba granodiorites are adakitic rocks. Electron microprobe data reveal that plagioclase belongs to andesine and oligoclase (An=16.2-34.7). This paper believes that the parent magmas of the Menba granodiorites may be a result of magma mixing between mantle- and crust-derived magmas and the mantle-derived magma underplating may have led to partial melting of the thickened lower crust and then reactions between them. Combined with the diagenetic environment and spatial distribution characteristics of the Late Cretaceous magmatic rocks. This paper concludes that the Late Cretaceous magmatism in the southern Lhasa block was mainly controlled by the ridge subduction of the Neo-Tethys. The upwelling of asthenosphere mantle along the slab window of the mid-ocean ridge induced the Late Cretaceous large-scale magmatism in the southern margin of the south Lhasa block, while the upwelling of asthenosphere material along the tear slab window of transition fault that cuts the mid-ocean ridge induced the small-scale intraplate magmatic belt, which approximately perpendicular to the large-scale magmatism in the southern margin of the south Lhasa block.
- Lhasa block,
- Late Cretaceous,
- adakitic rock,
- magma mixing,
- ridge subduction,
- slab window,
- petrology

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References(57)

References

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Petrogenesis and Geodynamic Processes of the Mamba Granodiorite, Central Lhasa Block, Xizang

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