Gold in Madagascar |
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| Authors: | Andriamampianina Roger Rambeloson |
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| Institution: | aDépartement des Sciences de la Terre, Université d'Antananarivo, Madagascar |
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| Abstract: | Gold is commonly found throughout the Precambrian basement exposed in the eastern two-thirds of Madagascar, composed of Archean and Proterozoic greenstone belts and metasediment belts. Gold occurs in four main kinds of deposits:- as a diffuse component of the crystalline basement rocks, - in concordant quartz veins within the metamorphic rocks of the Precambrian basement, - in recent discordant veins, - and in recent and ancient alluvial deposits.The initial gold mineralisation is probably in relation with the greenstone belt formation, and many have been formed and/or reworked during different metamorphic and magmatic events. It is therefore difficult to obtain an accurate age of the different kinds of deposits. |
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| Keywords: | Madagascar gold Precambrian ore deposit greenstone belts |
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