攀西红格层状岩体中辉绿岩脉成因及地质意义

王坤; 李奇维; 秦颖; 李祥波; 董欢

doi:10.3799/dqkx.2022.158

Volume 47 Issue 11

Nov. 2022

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Wang Kun, Li Qiwei, Qin Ying, Li Xiangbo, Dong Huan, 2022. Origin and Geological Significance of Diabase Dikes from Hongge Layered Intrusion in Panxi Region. Earth Science, 47(11): 4294-4308. doi: 10.3799/dqkx.2022.158

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Wang Kun, Li Qiwei, Qin Ying, Li Xiangbo, Dong Huan, 2022. Origin and Geological Significance of Diabase Dikes from Hongge Layered Intrusion in Panxi Region. Earth Science, 47(11): 4294-4308. doi: 10.3799/dqkx.2022.158

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Origin and Geological Significance of Diabase Dikes from Hongge Layered Intrusion in Panxi Region

doi: 10.3799/dqkx.2022.158

Wang Kun^{1, 2
,
,},
Li Qiwei³,
Qin Ying⁴,
Li Xiangbo²,
Dong Huan⁵

1.
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
2.
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
4.
Sun Yueqi Honors College, China University of Mining and Technology, Xuzhou 221116, China
5.
School of Geosciences, Yangtze University, Wuhan 430100, China

Received Date: 2022-01-23
Available Online: 2022-12-07
Publish Date: 2022-11-25

Abstract

Abstract

In order to understand the evolution of the magmatic system of the Emeishan mantle plume, whole-rock major and trace elements, in-situ mineral composition and isotope studies as well as MELTS simulation were carried out on the diabase dikes in the Hongge giant Fe-Ti-V oxide deposit. The study shows that the Hongge diabases have consistent REE patterns and Sr-isotope compositions with the Emeishan high-Ti basalts, indicating that the diabases were derived from the Emeishan mantle plume. The Hongge diabases contain two generations of minerals, i.e., phenocryst and matrix. It is found that Mg^# value of clinopyroxene varied continuously from the phenocryst core to rim and matrix, while the An values of plagioclase show an obvious discontinuity. The MELTS simulation results show that the composition variation could not be explained by a simple process of magma ascending, reflecting the basaltic magma may have mixed with the synchronous syenitic magma during the evolution process. Our research suggests that the Emeishan mantle plume magmatism is characterized by trans-crustal, poly-phase and multi-stage evolution, and "self-mixing" between co-genetic magmas is also nonnegligible.
- diabase,
- layered intrusion,
- Panxi region,
- Emeishan large igneous province,
- petrology

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References(56)

References

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Origin and Geological Significance of Diabase Dikes from Hongge Layered Intrusion in Panxi Region

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