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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摘要

低密度地球化学填图具有采样水系级别高、工作覆盖面积广阔的特征,可有效追溯具有高金属含量的地球化学块体。本次研究以埃塞俄比亚1:100万低密度地球化学填图数据为基础,通过对原始水系沉积物中Cu测试数据处理后,应用迭代剔除的方法,计算得出Cu的异常下限值为37×10^-6。在此基础上,以37×10^-6、42×10^-6、47×10^-6、52×10^-6、59×10^-6、66×10^-6作为分级间隔,共圈定出地球化学块体3个、区域异常2个。通过参考相同成矿带中铜矿勘查研究程度较高的地球化学块体中已知铜矿床储量,计算出研究区的Cu块体成矿率为0.055%。本次以1 000 m 岩块厚度估算出研究区内Cu的资源量为260万t。结合区域成矿地质条件分析,确定2号、3号、4号地球化学块体所在区域可作为开展进一步详细勘查工作的重点成矿远景区。

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	向文帅
	白洋
	姜军胜
	雷义均
	HUNDIE Melka
	SISAY Degu
	张元培
	吴颖
	郑雄伟

关键词 ：埃塞俄比亚, 铜, 地球化学块体, 资源潜力, 成矿远景区

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

收稿日期: 2022-04-19 修回日期: 2023-01-02 出版日期: 2023-08-20

ZTFLH:

P632

基金资助:中国地质调查局地质调查项目(DD20190443);中国地质调查局地质调查项目(DD20160109)

通讯作者: 白洋(1988-),男,硕士研究生,长期从事境外地球化学勘查工作。Email:493652968@qq.com

作者简介: 向文帅(1986-),男,博士研究生,长期从事境外地质矿产调查与研究工作。Email:oldwenzi@163.com

引用本文:

向文帅, 白洋, 姜军胜, 雷义均, HUNDIE Melka, SISAY Degu, 张元培, 吴颖, 郑雄伟. 地球化学块体法在埃塞俄比亚铜矿资源评价中的应用[J]. 物探与化探, 2023, 47(4): 845-855.
XIANG Wen-Shuai, BAI Yang, JIANG Jun-Sheng, LEI Yi-Jun, HUNDIE Melka, SISAY Degu, ZHANG Yuan-Pei, WU Ying, ZHENG Xiong-Wei. Application of the geochemical block method to the assessment of copper resources in Ethiopia. Geophysical and Geochemical Exploration, 2023, 47(4): 845-855.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1198 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I4/845

Fig.1 埃塞俄比亚—厄立特里亚地质及采样点位分布(据文献[15]修编)

Fig.2 厄立特里亚—埃塞俄比亚北部区域地质矿产简图(据文献[20]修编)

Table 1 处理后Cu地球化学特征参数及地球化学块体含量级次

Fig.3 研究区铜地球化学块体及区域异常分布

Fig.4 2号铜地球化学块体内部结构及谱系树图
(a~f依次为第1级次至第6级次的地球化学块体,分别含1、1、4、4、4、4个子块体)

Fig.5 1号地球化学块体内部结构及谱系树图
(a~d依次为第1级次至第4级次的地球化学块体,分别含1、4、1、1个子块体)

Fig.6 2号地球化学块体及所在区地质矿产分布

Table 2 铜地球化学块体的数据统计特征

Table 3 铜区域异常的数据统计特征

Table 4 Cu地球化学块体及区域异常内铜资源潜力估算

Fig.7 3号地球化学块体及所在区地质矿产分布

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