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Although not well known by most people, tin (Sn) and tungsten (W) are two metals that are important in our society. Tin is for instance used for the production of corrosion-resistant steel, as a solder and for the production of bronze, while tungsten is used in cutting tools, heavy metal alloys, light bulbs and dental drills. Tin and tungsten deposits can be found worldwide. Tin and tungsten are often closely associated to one another and can even occur in the same deposit. The Mesoproterozoic Karagwe-Ankole belt (KAB) in Central Africa hosts numerous Sn and W deposits. These mineralisations principally occur in pegmatites and hydrothermal quartz veins that are presumably related to granite intrusions. This PhD study focuses on the Sn and W vein-type mineralisations in the central part of the KAB, in Rwanda. This study aims to determine the origin and evolution of the Sn and W vein-type deposits, focussing on the evolution of the mineralising fluids and their composition (geochemistry). The mineralising fluids are studied by means of a detailed petrographical, geochemical and microthermometrical study and by using specialised geochemical techniques (LA-ICP-MS, crush-leach, Raman analysis and stable isotope geochemistry). The absolute age of the ore deposits is determined by means of the 40Ar-39Ar dating technique. The metasedimentary rocks of the KAB in Central Africa have been affected at ~1375 Ma by a major intracratonic bimodal magmatic event (Tack et al., 2010).

Academic collection --- 55 <675.98> --- 553.45 --- 553.463 --- 553.463 Tungsten deposits --- Tungsten deposits --- 553.45 Tin deposits. Stanniferous deposits --- Tin deposits. Stanniferous deposits --- Earth sciences. Geology. Meteorology etc.--Ruanda. Rwanda --- Theses