Geochemistry of Paleoproterozoic metavolcanic rocks from the southern Ashanti volcanic belt, Ghana: Petrogenetic and tectonic setting implications

Geochronology of the Birim Supergroup of the West African craton in the Wa-Bolé region of west-central Ghana: Implications for the stratigraphic framework

“…The ages provided by the researchers mentioned above indicate magmatic activity clusters at $2300 Ma, 2210-2190Ma, 2185-2150Ma, 2115-2100Ma, 2090-2070Ma and 2060 In most terranes within the West African craton only two phases of fold deformation were recognized, with most of the granitoids considered as syntectonic emplacements. Currently, the geotectonic evolution of the West African craton is described according to three models: (1) subduction of an intraoceanic plateau (Abouchami et al, 1990;Boher et al, 1992); (2) basin and belt scenario ; and (3) based on chemistry alone, an arc-back-arc environment (Sylvester and Attoh, 1992;Béziat et al, 2000;Attoh et al, 2006;Dampare et al, 2008). Lompo (2010) condensed the evolution of the West African craton as follows: The first event (2250-2200 Ma) with widespread intraoceanic tholeiitic mantle-plume magmatism; the second event (2200( -2150 with the second and third tholeiite generations, and calc-alkaline magmatism with high granitization and emplacement of amphibole-bearing granitoids into greenstone belts, basin subsidence to megasynclinoria was followed by vertical tectonics; and the third event (2150 of biotite ± muscovite (without amphibole) granitoid generation during transcurrent tectonism.…”

Age constraints of the Wassa and Benso mesothermal gold deposits, Ashanti Belt, Ghana, West Africa

“…It is intruded by granitic suites characteristic of the Birimian Supergroup. Both the Birimian package and the overlying sediments of the Tarkwa Supergroup underwent similar deformation events Dampare et al, 2008). The Tarkwaian sediments are dominated by conglomerates, quartzose and arkosic sandstones, siltstones and minor amounts of shales (Allibone et al, 2002a,b).…”

“…The Birimian Supergroup is represented by five near parallel NE trending volcanic belts: Bole-Navrongo, Bui, Sefwi, Ashanti and Kibi-Winneba. Their width oscillates between 15 and 40 km and average spacing between belts is close to 90 km (Leube et al, 1990;Taylor et al, 1992;Pigois et al, 2003;Dampare et al, 2008). Separating the volcanic belts are The Maluwe, Sunyani, Kumasi and Cape Coast basins, which contain Birimian sedimentary rocks, whereas the basins of Tarkwaian Supergroup sedimentary rocks are only found in the Ashanti and Bui belts.…”

Late Paleoproterozoic Basites of Northern Baikal Area: Composition and Melt Sources

“…5). На диаграмме Th/Yb-Nb/Yb [Pearce, 1983;Dampare et al, 2008] (рис. 7) фигуративные точки всех базитов располагаются вне поля базаль-тов N-MORB -E-MORB -OIB и попадают в об-ласть пород, формирующихся за счет мантийных Та бл и ц а 5 .…”