| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
SUN Kai, ZHANG Hang, LU Yiguan, QIU Lei, HE Shengfei, REN Junping, XU Kangkang, LIU Xiaoyang. 2022. Analysis on geological characteristics and prospecting potential of the Central African Cu-Co metallogenic belt[J]. Geology in China, 49(1): 103-120. doi: 10.12029/gc20220107
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Analysis on geological characteristics and prospecting potential of the Central African Cu-Co metallogenic belt
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Abstract
This paper is the result of mineral exploration engineering.
Objective The Central African copper-cobalt metallogenic belt which straddles the border area between the Democratic Republic of the Congo (DRC) and Zambia, is the world's most famous sediment-hosted stratabound copper-cobalt metallogenic belt. It is the world's third-largest copper and first-largest cobalt producer, but its mineralization pattern and potential are still unclear.
Methods In this paper, the geological setting, tectonic evolution and mineralization, temporal-spatial distribution rules of deposits, deposit models of the Central African copper-cobalt metallogenic belt were studied. 32 copper (cobalt) prospective areas were delineated by applying the fuzzy weight of evidence method with stratigraphic, tectonic, geochemical, remote sensing alteration and other geological elements that are closely related to mineralization. The number of undiscovered deposits in each prospective area was calculated based on the posterior probability of mineralization at different probabilities.
Results Monte Carlo simulation combined with the tonnage-grade model indicate that the average undiscovered copper resource in this area is estimated to be 288 million tons and the average cobalt resource is estimated to be 19.92 million tons, respectively.
Conclusions The complex evolutionary history of the Central African copper and cobalt metallogenic belt has resulted in the superposition of multiple metallogenic interactions such as sedimentary mineralization, hydrothermal mineralization and epigenetic enrichment in this region, with copper (cobalt) mineralization running through the evolution of the belt and mineralization closely related to stratigraphy and tectonics. In particular, the Likasi-Kolwezi area of the Democratic Republic of the Congo may have good prospects for mineralization.
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References
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SUN Kai, ZHANG Hang, LU Yiguan, QIU Lei, HE Shengfei, REN Junping, XU Kangkang, LIU Xiaoyang. 2022. Analysis on geological characteristics and prospecting potential of the Central African Cu-Co metallogenic belt[J]. Geology in China, 49(1): 103-120. doi: 10.12029/gc20220107
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Figure 1.
Simplified regional geological map of the Central African Cu-Co Metallogenic Belt (modified from Selley et al., 2005; Kampunzu et al., 2009)
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Figure 2.
Distribution of main types of Cu-(Co) deposits in Central African Copperbelt
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Figure 3.
Formation model of the shale type Cu-(Co) deposits (after Large et al., 2017)
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Figure 4.
Formation model of carbonate écaille Cu-(Co) deposits (after Hitzman et al., 2012)
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Figure 5.
Formation model of sandstone Cu-(Co) deposits (after Selley et al., 2005)
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Figure 6.
Formation model of the structurally controlled replacement and vein Cu-(Co) deposits (after El Desouky et al., 2008)
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Figure 7.
Formation model of the ore-bearing basement Cu deposits (after Bernau, 2007)
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Figure 8.
Plot showing the relationship between the distance from the faults and students t-value calculated using weights of evidence method
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Figure 9.
Evidence layers for mineral prediction in Central African Copperbelt
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Figure 10.
Distribution of tracts of Central African Copperbelt
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Figure 11.
Histogram illustrating the distribution of log-transformed values for grade of Cu deposits (a) and Co deposits (b), tonnage of Cu deposits (c) and tonnage of Co deposits (d), and bivariate graphs of ore tonnage against ore grade of Cu deposits (e), and Co deposits (f) in Central African Copper Belt