Fluid inclusions in quartz-pebbles of the gold-bearing Tarkwaian conglomerates of Ghana as guides to their provenance area |
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| Authors: | R Klemd W Hirdes M Olesch T Oberthür |
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| Institution: | 1. Fachbereich Geowissenschaften, Universit?t Bremen, P.O. Box 330440, D-28334, Bremen, Germany
2. Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655, Hannover, Germany
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| Abstract: | Quartz-pebbles of the early Proterozoic Au-bearing Tarkwaian conglomerates in Ghana reveal several original (inherited) pre-sedimentary
fluid inclusions. These inclusions are CO2-N2 rich and display a distinct high density (up to 1.15 g/cm3). The unusual high density and composition compare well with CO2-N2-rich inclusions in quartz-vein type gold deposits of the Birimian Supergroup in Ghana and Burkina Faso. This type of fluid
inclusions has not been reported from any other lode-gold deposit of greenstone affiliation and is thus a specific characteristic
for Birimian-hosted gold deposits. Therefore, it can be used as an unequivocal pathfinder for epigenetic as well as for syn-sedimentary
gold mineralization of the early Proterozoic of West Africa. The inherited fluid inclusions with the unique physicochemical
characteristics suggest that the Tarkwaian quartz-pebbles and possibly some gold were derived from Au-quartz vein deposits
comparable in mineralogy, petrography and genesis to those along the NW-margin of the Ashanti belt (e.g. Ashanti Mine, Prestea
Mine). |
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