Por: Richard Chuqui, Diego Domínguez-Carretero y Joaquín A. Proenza, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona; Isaac Corral, Departament de Geologia, Facultat de Ciències, Universitat Autònoma de Barcelona, y Lisard Torró, Programa de Ingeniería Geológica, Pontificia Universidad Católica del Perú. 

Trabajo ganador en formato póster del II Concurso Internacional de Estudiantes SEG-SGA-IIMP.

Abstract

The Majagual prospect in the Dominican Republic is hosted by the Early Cretaceous Los Ranchos Formation, which also hosts the world-class Pueblo Viejo epithermal Au deposit. Drill cores at Majagual exhibit alteration assemblages and veining that are typical of shallow porphyry (Cu) and deep epithermal environments. 

The composition of pyrite grains (Co/Ni>1), combined with their sulfur isotopic composition (δ34S ranging from -2‰ to +3‰), supports a predominantly magmatic origin for the sulfur in the hydrothermal fluids.