Metallogenic zoning in Northwestern Venezuela
Rodriguez, Simon E.
published: Dec 1, 1999
ArtNo. ESP136000702014, Price: 19.00 €
Detailed studies carried out by the Geological Survey of Venezuela (Direccion de Geologia) in northwestern Venezuela, between the towns of Carora and Aroa, have revealed important metallogenic zone in Lower Cretaceous to Tertiary rocks. The area covers more than 20,000 square kilometers. Geologically, it is composed in the eastern part by thick Lower Cretaceous metamorphic rocks, and by Tertiary and Cretaceous sediments in the western part. Large deep-seated structures affecting the different stratigraphic units and related to tectonic events in the Caribbean Block, are present in the region. The different metallogenic belts are located near the intersections of these deep-seated structures. The metallogenic zoning developed in the region is characterized, in the eastern part, by pyrite - chalcopyrite - pyrrhotite veins, affecting Lower Cretaceous metamorphic rocks. The central part hosts boulangerite, sphalerite, galena, tetrahedrite and arsenopyrite veins, and the western zone is typified by cinnabar veins in Tertiary sediments. Apparently, metallogenic zoning is closely associated with deep-seated structures. Mapping these structures constitutes an important tool for outlining areas with different types of ore deposits.