埃塞俄比亚西部布雷地区A型花岗岩成因及地质意义

向文帅; 姜军胜; 雷义均; 赵凯

doi:10.3799/dqkx.2020.209

Volume 46 Issue 7

Jul. 2021

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Xiang Wenshuai, Jiang Junsheng, Lei Yijun, Zhao Kai, 2021. Petrogenesis of A-Type Granite and Geological Significance of Bure Area, Western Ethiopia. Earth Science, 46(7): 2299-2310. doi: 10.3799/dqkx.2020.209

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Xiang Wenshuai, Jiang Junsheng, Lei Yijun, Zhao Kai, 2021. Petrogenesis of A-Type Granite and Geological Significance of Bure Area, Western Ethiopia. Earth Science, 46(7): 2299-2310. doi: 10.3799/dqkx.2020.209

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Petrogenesis of A-Type Granite and Geological Significance of Bure Area, Western Ethiopia

doi: 10.3799/dqkx.2020.209

Xiang Wenshuai^{1, 2
,
,},
Jiang Junsheng^{2
,
,
,},
Lei Yijun²,
Zhao Kai²

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Wuhan Center, China Geological Survey, Wuhan 430205, China

Received Date: 2020-07-16
Publish Date: 2021-07-15

Abstract

Abstract

In order to furtherly constrain the evolution of regional geological structure in the western Ethiopia, we selected the magmatic rocks from the Bure area of western Ethiopia for petrogeochemical and chronologic analysis.The Burequartz monzonite in western Ethiopia has relatively high SiO₂(66.4% to 68.5%), K₂O (4.56% to 4.87%), and iron value (TFeO/(TFeO+MgO) is 0.75 to 0.79), and relatively low MgO (0.8% to 1.3%), CaO (2.01% to 2.36%), and A/CNK (0.89~0.96), withthe characteristic that areemriched in elements such as Zr, Hf, Y, and Ga, and depleted Sr, P, Ti, and Eu elements, which reveal the feature of A-type granite. The zircon LA-ICP-MS U-Pb age of the rock is 631±4 Ma (MSWD=2.9), representing the extension stage of the East African orogenic movement. The ε_Hf(t) values of Bure A-type granite range from 3.2 to 9.1 (average=7.3), showing a relatively inhomegeneous feature. The Bure A-type granite formed in the post-stretching environment of the East African orogenic movement. Thewhole rock geochemistryand Hf isotopic characteristicssuggest that the Bure A-type granite may originated from basaltic magma in the thinned lithospheric mantle, and then formed through extensive crystallization differentiation.
- zircon U-Pb geochronology,
- geochemistry,
- A-type granite,
- Bure area, western Ethiopia

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References(39)

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