DISPERSED GOLD AND ASSOCIATED DISSEMINATED MINERALIZATION OF LEUCOGRANITES OF THE DUKAT ORE FIELD AS INDICATORS OF THE GENERATION CONDITIONS OF MAGMATOGENE GOLD-BEARING FLUIDS
L.G. Filimonova, N.V. Trubkin
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russia
Keywords: Dispersed gold, fine mineral mixtures, disseminated mineralization, fluid melt, leucocratic subvolcanic bodies
Abstract
We present data on dispersed gold and associated disseminated mineralization of leucogranites controlling the location of the Dukat epithermal Au-Ag deposit. The data suggest the formation and burial of small portions of oversaturated gold-bearing fluids in hypabyssal magmatic bodies. The lower (relative to silver) contents of gold in the deposit ores and the high Ag/Au ratios (350-550) are due to the limited occurrence of oxidized gold-bearing fractions of magmatogene fluids. This limitation is explained by the active interaction of late magmatic portions of fluids and the material of the host carbonaceous volcanosedimentary unit and by the formation of an environment favorable for the concentration, migration, and deposition of manganese, silver, and nonferrous-metal compounds.
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