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International Journal of Geophysics
Volume 2012 (2012), Article ID 371059, 11 pages
http://dx.doi.org/10.1155/2012/371059
Research Article

Geoelectric Exploration of the Purísima-Rumicruz District, Jujuy Province, Argentina

1INREMI, Facultad de Ciencias Naturales y Museo, UNLP, Calle 64 Esquina 120, 1900 La Plata, Argentina
2Consejo Nacional de Investigaciones Científicas y Técnicas, (CONICET), 1917 Buenos Aires, Argentina
3Comisión de Investigaciones Científicas de Buenos Aires, (CICBA), 1900 La Plata, Argentina
4Universidad Nacional de La Plata, (UNLP), 1900 La Plata, Argentina

Received 29 March 2012; Revised 24 July 2012; Accepted 20 September 2012

Academic Editor: Michael S. Zhdanov

Copyright © 2012 Luciano López et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purísima-Rumicruz district consists of several polymetallic veins, rich in copper and lead. The veins have a breccia texture and are located in shear bands, with locally high concentrations of sulfides in a carbonatic gangue. The host rock of the veins consists of a black shale sequence with thin levels of fine sands, with a low degree of metamorphism, and corresponds to the Acoite formation (Lower Ordovician). The depositional environment was an open clastic platform where storm processes prevailed. An exploratory program using induced polarization and resistivity with the dipole-dipole method was carried out with the objective of establishing geoelectric anomalies in depth, which would permit the identification of exploratory targets. The group of veins was divided into three sectors: Purísima, El Brechón, and La Nueva. Low-resistivity values correspond to faulty zones, some of which are related to surface veins. The presence of diagenetic pyrite in the shales of Acoite formation considerably increases background chargeability (induced polarization) values. However, small chargeability anomalies associated to low-resistivity values represent exploratory targets for the Purísima-Rumicruz district.