Hyperspectral remote sensing applied to mineral exploration in southern Peru: A multiple data integration approach in the Chapi Chiara gold prospect

Autor(es)

Carrino, Thais Andressa ^[1] ; Crosta, Alvaro Penteado ^[2] ; Bemfica Toledo, Catarina Laboure ^[3] ; Silva, Adalene Moreira ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Pernambuco, Dept Geol, Ave Arquitetura, S-N, BR-50740550 Recife, PE - Brazil

^[2] Univ Estadual Campinas, Inst Geosci, POB 6152, BR-13083870 Campinas, SP - Brazil

^[3] Univ Brasilia, Inst Geosci, Campus Univ Darcy Ribeiro S-N, BR-70910900 Brasilia, DF - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Applied Earth Observation and Geoinformation; v. 64, p. 287-300, FEB 2018.
• Citações Web of Science: 13

Resumo

Remote sensing is a strategic key tool for mineral exploration, due to its capacity of detecting hydrothermal alteration minerals or alteration mineral zones associated with different types of mineralization systems. A case study of an epithermal system located in southern Peru is presented, aimed at the characterization of mineral assemblies for discriminating potential high sulfidation epithermal targets, using hyperspectral imagery integrated with petrography, XRD and magnetic data. HyMap images were processed using the Mixture Timed Matched Filtering (MTMF) technique for producing alteration map in the Chapi Chiara epithermal gold prospect. Extensive areas marked by advanced argillic alteration (alunite-kaolinite-dickite +/- topaz) were mapped in detail, as well as limited argillic (illite-smectite) and propylitic (chlorite spectral domain) alteration. The magmatic-hydrothermal processes responsible for the formation of hypogene minerals were also related to the destruction of ferrimagnetic minerals (e.g., magnetite) of host rocks such as andesite, and the remobilization/formation of paramagnetic Fe-Ti oxides (e.g., rutile, anatase). The large alteration zones of advanced argillic alteration are controlled by structures related to a regional NW-SE trend, and also by local NE-SW and ENE-WSW ones. (AU)

• Processo FAPESP: 11/00106-8 - Geologia e alteração hidrotermal do prospecto aurífero chapi chiara e adjacências, sul do peru, a partir de dados geológicos, de sensoriamento remoto, geoquímicos e magnéticos
• Beneficiário: Thais Andressa Carrino
• Modalidade de apoio: Bolsas no Brasil - Doutorado