Geoquímica de sedimentos fluviales en la microcuenca del río Elvira.

This work was carried out in the Elvira River micro-watershed, located in the extreme south of Ecuador, in the province of Loja, covering the jurisdiction of the Quilanga canton and part of the Gonzanama (Purunuma, Changaimina, Gonzanama parishes) and Calvas (Cariamanga parish) cantons. The total area of the micro-watershed is 318.52 km2. This study consisted of the elaboration of geochemical maps of the elements Au, Ag, Cu, Mo, Hg, As, Sb, Zn, Ni, and Pb for the Elvira River micro-watershed, not only to verify the possible existence of areas with mineralization anomalies, but also to provide basic information in order to discover possible mineral deposits of economic interest. The methodology used consisted of a global statistical analysis for the elements Au, Ag, Cu, Mo, Hg, As, Sb, Zn, Ni, and Pb in order to normalize the database, then the Lepeltier method was used to define anomalies, thresholds and background values that were plotted on the sampling points. In addition, geochemical data interpolation was performed by the IDW interpolation method in order to establish multi-elemental associations. Three sectors with metallogenic potential were established: sector 1 located north of the study area with the presence of Zn, As, Ag, Au, Sb and Hg anomalies, this association may be related to epithermal deposits and sector 2 located south of Gonzanamá and north of Quilanga has Zn, As, Cu and Au anomalies, so it is related to low sulfidation epithermal deposits, associated to andesitic porphyry. Sector 3 located in the San Antonio de las Aradas parish is associated with Au, Cu, As, Ag and Mo, which suggests that it may be associated with a copper porphyry type deposit, related to volcano-sedimentary rocks of the El Ingenio Unit. This sector is crossed by the Las Aradas fault, being this structure an important control for this type of mineralization. Key words: Geochemical maps, Elvira river micro-basin, anomalies, geochemistry, IDW, low sulfidation epithermal, porphyry copper.

• Hovedforfatter: León González, Nathaly Silvana (author)
• Format: bachelorThesis
• Sprog: spa
• Udgivet: 2021
• Fag: <MAPAS GEOQUÍMICOS>< MICROCUENCA DEL RIO ELVIRA>< GEOQUÍMICA>< IDW> <EPITERMAL DE BAJA SULFURACIÓN>< PÓRFIDO CUPRÍFERO>
• Online adgang: https://dspace.unl.edu.ec/jspui/handle/123456789/24233