地球化学块体法在埃塞俄比亚铜矿资源评价中的应用

doi:10.11720/wtyht.2023.1198

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Abstract

Low-density geochemical mapping is characterized by high order streams to be sampled and a large coverage area and can be used to effectively trace geochemical blocks with high metal contents. Based on the 1:1,000,000 low-density geochemical mapping data of Ethiopia and the processing of the testing data of Cu in the original stream sediments, this study calculated the anomaly threshold of Cu at 37×10^-6 through iterative deletion. Then, this study delineated three geochemical blocks and two regional anomalies with 37×10^-6, 42×10^-6, 47×10^-6, 52×10^-6, 59×10^-6, and 66×10^-6 as grading intervals. It calculated the mineralization coefficient of Cu ore bodies in the study area at 0.055% by referencing the known reserves of Cu deposits in geochemical blocks with a high level of copper exploration in the same metallogenic belt. Moreover, this study estimated the Cu resources in the study area at 2,600,000 t based on a rock mass thickness of 1,000 m. By combining the analysis of metallogenic geological conditions, this study determined that the zones where geochemical blocks nos. 2, 3, and 4 are located can be considered key metallogenic prospect areas for further detailed exploration.

Key words： Ethiopia copper geochemical block resource potential metallogenic prospect area

Received: 19 April 2022 Published: 11 October 2023

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	Articles by authors
	Wen-Shuai XIANG
	Yang BAI
	Jun-Sheng JIANG
	Yi-Jun LEI
	Melka HUNDIE
	Degu SISAY
	Yuan-Pei ZHANG
	Ying WU
	Xiong-Wei ZHENG

Cite this article:

Wen-Shuai XIANG,Yang BAI,Jun-Sheng JIANG, et al. Application of the geochemical block method to the assessment of copper resources in Ethiopia[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 845-855.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1198 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/845

15])
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Brief geologyand sample point map of Ethiopia-Eritrea(revised according to reference [15])

20])
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Brief geology and mineral map of Eritrea-North Ethiopia(revised according to reference [20])

Processed geochemical statistic characteristics of copper and content level of the geochemical blocks

Distribution of copper geochemical blocks and regional anomalies in study area

Internal structure of No.2 copper geochemical block
(a~f is first to sixth level content, including 1,1,4,4,4,4 child geochemical blocks respectively)

Internal structure and Family tree diagram of No.1 copper geochemical block
(a~d is first to fourth level content,includig 1,4,1,1 child geochemical blocks respectively)

No.2 geochemical block and brief regional geology and mineral map

Statistic characteristic of copper geochemical blocks

Statistic characteristic of copper regional geochemical anomalies

Estimated potential copper resources of copper geochemical blocks and regional anomalies

No.3 geochemical block and brief regional geology and mineral map

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