The Augaro Arc-type Granite in the Nubia Shield, Western Eritrea: Petrogenesis and Implications for Neoproterozoic Geodynamic Evolution of the East African Orogen

ZENG Guoping; WANG Jianxiong; XIANG Wenshuai; ZHANG Zicheng; JIANG Junsheng; XIANG Peng

doi:10.12401/j.nwg.2023144

2024 Vol. 57, No. 2

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Article navigation > Northwestern Geology > 2024 > 57(2): 159-173

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ZENG Guoping, WANG Jianxiong, XIANG Wenshuai, ZHANG Zicheng, JIANG Junsheng, XIANG Peng. 2024. The Augaro Arc-type Granite in the Nubia Shield, Western Eritrea: Petrogenesis and Implications for Neoproterozoic Geodynamic Evolution of the East African Orogen. Northwestern Geology, 57(2): 159-173. doi: 10.12401/j.nwg.2023144

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ZENG Guoping, WANG Jianxiong, XIANG Wenshuai, ZHANG Zicheng, JIANG Junsheng, XIANG Peng. 2024. The Augaro Arc-type Granite in the Nubia Shield, Western Eritrea: Petrogenesis and Implications for Neoproterozoic Geodynamic Evolution of the East African Orogen. Northwestern Geology, 57(2): 159-173. doi: 10.12401/j.nwg.2023144

The Augaro Arc-type Granite in the Nubia Shield, Western Eritrea: Petrogenesis and Implications for Neoproterozoic Geodynamic Evolution of the East African Orogen

1.
Wuhan Center of China Geological Survey / Central South China Innovation Center for Geosciences, Wuhan 430205, Hubei, China
2.
School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China
3.
China Geological Mining Company Ltd., Beijing 100029, China

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Corresponding author: WANG Jianxiong, 245425463@qq.com

Received Date: 31 May 2023

Revised Date: 24 July 2023

Accepted Date: 24 August 2023

Publish Date: 20 April 2024

Abstract

Abstract

The East African orogen is a collisional collage belt of East Gondwana and West Gondwana. A deep study of the evolution of the orogenic belt is of great significance for understanding the supercontinent cycles. Zircon LA-ICP MS U–Pb ages and Hf isotopic compositions, whole rock major and trace elements and Sr-Nd isotopic compositions of the Meraf granite within the Augaro, west Eritrea, are reported in this paper to study the petrogenesis and implications for the Neoproterozoic tectonic evolution of the East African orogenic belt. LA-ICPMS zircon U-Pb dating of the Meraf granite yields magmatic crystallization age of (875±6) Ma. The Meraf granite has geochemistry patterns resembling those of Arc-type granite, with high-SiO₂, calc-alkaline and peraluminous, and enriched in LREE and LILE such as Ba, Rb, K, relatively depleted in HREE and HFSE such as Ta, Nb, Ti, with weak Eu negative anomalies (δEu= 0.70-0.91). Combined with the positive ε_Hf (t) (7.7~9.9), low initial ⁸⁷Sr/⁸⁶Sr (0.70200~0.70273), and remarkable ε_Nd(t) values (4.85~6.06), the Meraf granite is supposed to be the product of partial melting of the mantle wedge triggered by dehydration of the subducting oceanic plate. Together with widespread Neoproterozoic arc-type granites in the East African orogen, the break-up of Supercontinent and formation of Mozambique oceanic are believed to predate the 875Ma.
- geochemistry /
- arc-type granite /
- zircon U-Pb dating /
- Neoproterozoic /
- east african orogen

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References

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