Domos volcánicos y mineralización de oro en el distrito Pueblo Viejo, República Dominicana

摘要: Gold mineralization in the Pueblo Viejo district, Dominican Republic is spatially and temporallyrelated to a series of Early Cretaceous volcanic domes. Separate but overlapping hydrothermal cells, centeredon domes, together deposited more than 40 million ounces gold, 240 silver, 3 milliontonnes zinc, 0.4 tonnes copper. Two principal deposits (Moore Monte Negro) number smaller (Cumba, Mejita, Upper Banco V, Arroyo Hondo I II) have contributed oresince mining commenced 1975.Geologic mapping District has identified at least seven centers that interfinger, overlap, are interbedded with locally derived epiclastic sediments. These centered on previously-unrecognized domes vary from andesite dacite composition. Epiclasticvolcanic sediments surround reflect composition local source rock. A porphyrydome Moore deposit surrounded by contain detrital quartz eyes debrisflows porphyry. Andesite Negro, Cumba Mejita byepiclastic crumble breccias volcaniclastic sediments.Field relations indicate dome emplacement, sediment accumulation, alte-ration, gold were coeval events. Domes emplaced shallow subaqueous environmenton flanks an emergent edifice. Hydrothermal cells responsible for controlled high-angle faults. same faults influenced emplacement essential stepin development ore district.