厄立特里亚Koka花岗岩锆石U-Pb年代学、地球化学特征及其地质意义

赵凯; 姚华舟; 王建雄; Ghebsha FitwiGhebretnsae; 向文帅; 杨镇

doi:10.3799/dqkx.2018.237

Volume 45 Issue 1

Jan. 2020

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Article Navigation > Earth Science > 2020 > 45(1): 156-167

Zhao Kai, Yao Huazhou, Wang Jianxiong, Ghebsha Fitwi Ghebretnsae, Xiang Wenshuai, Yang Zhen, 2020. Zircon U-Pb Geochronology and Geochemistry of Koka Granite and Its Geological Significance, Eritrea. Earth Science, 45(1): 156-167. doi: 10.3799/dqkx.2018.237

Citation:

Zhao Kai, Yao Huazhou, Wang Jianxiong, Ghebsha Fitwi Ghebretnsae, Xiang Wenshuai, Yang Zhen, 2020. Zircon U-Pb Geochronology and Geochemistry of Koka Granite and Its Geological Significance, Eritrea. Earth Science, 45(1): 156-167. doi: 10.3799/dqkx.2018.237

Citation:

Zhao Kai, Yao Huazhou, Wang Jianxiong, Ghebsha Fitwi Ghebretnsae, Xiang Wenshuai, Yang Zhen, 2020. Zircon U-Pb Geochronology and Geochemistry of Koka Granite and Its Geological Significance, Eritrea. Earth Science, 45(1): 156-167. doi: 10.3799/dqkx.2018.237

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Zircon U-Pb Geochronology and Geochemistry of Koka Granite and Its Geological Significance, Eritrea

doi: 10.3799/dqkx.2018.237

1.
Wuhan Center, China Geological Survey, Wuhan 430205, China
2.
College of Silk Road, China University of Geosciences, Wuhan 430074, China
3.
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China

Received Date: 2018-07-06
Publish Date: 2020-01-15

Abstract

Abstract

Koka granite, located in the west of the Nakfa region in Eritrea, is the main host rock of Koka gold deposit. The major elements of the granite are characteristiced by high SiO₂ (67.94%-78.40%), Na₂O+K₂O (5.86%-8.76%), Al₂O₃ (11.05%-16.51%) and FeO^T (2.46%-3.80%), weakly peraluminous to strongly peraluminous (A/CNK is 1.09-1.55), and low CaO (0.06%-1.85%), MgO (0.15%-0.39%). It is also enriched in LREEs and relatively depleted in HREEs, strongly depleted in Sr, P, Ti. The REE distribution curve shows characteristics such as swallow distribution and apparent negative europium anomalies. All of these indicate that the Koka granite has an affinity of A-type granite. Zircon LA-ICP-MS U-Pb dating shows the granite formed in early period of the Neoproterozoic with the diagenetic age of 851.2±1.9 Ma. This is different from the A-type granite which is widely distributed and related to the extension after collisional orogen (650-540 Ma). Combined with the regional geological research results, it is suggested that Koka granite was formed in a back-arc extensional environment which resulted from subduction. The zircon has a certain Ce positive anomaly, and variation range of the Ce⁴⁺/Ce³⁺ is 3.86-146.31, with an average of 32.4, indicating low degree of magmatic oxygen fugacity. Meanwhile the parental magma of Koka granite is "dry", suggesting that the metallogenic potentiality is low, and it is hard to form related large or super large deposits.
- Koka gold deposit,
- zircon U-Pb dating,
- geochemistry,
- Eritrea

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