Exploración geoquímica por Cu y Ag en el prospecto San Fidel – Tornamesa - Huarochirí – Lima

Abstract

The study area falls within the zone corresponding to the sheet of the National Charter: Chosica 24J, it covers a part of the central coast to the western edge of the Peruvian Andes The morphological development has been generated through various tectonic episodes, the same that have led to the current geomorphological features characterized by broad altitude slopes located on the right bank of the Rimac River In the area there is a stratigraphic sequence comprising lithologic units ranging in age from Jurassic to Recent, with manifestations of hydrothermal flows Being able to describe the lithology and stratigraphic relationships, and we as older units, training Arahuay East Side (Andean western edge) containing limestone interbedded with volcanic, plus volcanic pyroclastic andesitic and clay sequences in the coastal area these rocks were covered during the Early Cretaceous. The host rock or metallotect in the area would be the volcanic group Fm Arahuay Rimac and, for purposes of the project is important geochemical structural development started in the Cretaceous, which has continued in the lower Tertiary compressive phase, which generates faulting and transverse fracture, affecting the folding batholith and Mesozoic stratigraphic units at the western edge of the Andes Here are produced the faulting system and certain circular structures in the area that would be able to determine the prospective potential of the study area corroborated by geochemical sampling and the results we show the existence of up to two geological structures that may justify extending the exploration project We need to note that the structural systems indicate the predominance of up to two systems of faults among which mainly the NE-SW tensional component of the overall Andean direction where conditions are more favorable for the development of deposits filoneanos. Furthermore, we have defined two circular regional structures that can help highlight the structural control of the area to develop methods of direct examination (diamond drilling) and indirect methods such as geophysical support modern software can give interpretation of the anomalies by mineralization. Finally we show that the systematic geological mapping, sampling and characterization of the study area to define three zones of alteration among which the silicification and propylitization, that its length matches the area of cooper and silver anomalies inducing resource potential in the area.