ПЕТРОЛОГИЧЕСКИЕ ОСОБЕННОСТИ И ЗОЛОТОНОСНОСТЬ МАГМАТИЧЕСКИХ ПОРОД РАЙОНА КАЛАНА (юг Мали)

Анотація

Petrological investigations had permitted to distinguish two stages of magmatic
activity. The earlier, predating the folding, is represented by komatiites, which have been
identified and depicted for the first time. The following step occurred over a period of
about 250 Ma. It was began from ultrametamorphism and finished by intrusive
magmatism, envelopping syn- and postorogenic development regims of geosyncline. It is
shown that the gold mineralization had been appeared due to the favourable combination
of mantle, lithogenic and crust processes.