中非铜钴成矿带地质特征与找矿前景分析

研究目的]横跨刚果(金)和赞比亚边境地区的中非铜钴成矿带是世界上著名的沉积岩层控型铜钴成矿带,是全球第三大铜产地和第一大钴产地,然而其成矿规律和成矿潜力仍不明朗.研究方法]本文通过对中非铜钴成矿带地质背景、构造演化与成矿、矿床时空分布规律、矿床模型等方面的研究,选择地层、构造、地球化学、遥感蚀变等与成矿密切相关的地...

Analysis on geological characteristics and prospecting potential of the Central African Cu-Co metallogenic belt

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.Highlights: copper-cobalt mineralization in the Central African copper-cobalt metallogenic belt is closely related to stratigraphy and tectonics; the copper- cobalt resource potential is quantified using the fuzzy weight of evidence method and Monte Carlo simulation.