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Geology and Hydrothermal Alteration of the Chapi Chiara Prospect and Nearby Targets, Southern Peru, Using ASTER Data and Reflectance Spectroscopy

2014; Volume: 110; Issue: 1 Linguagem: Inglês

10.2113/econgeo.110.1.73

1554-0774

Thais Andressa Carrino, Álvaro Penteado Crósta, Catarina Labouré Bemfica Toledo, Adalene Moreira Silva, Johann Lambert Silva,

Soil Geostatistics and Mapping

Research Article| January 01, 2015 Geology and Hydrothermal Alteration of the Chapi Chiara Prospect and Nearby Targets, Southern Peru, Using ASTER Data and Reflectance Spectroscopy Thais Andressa Carrino; Thais Andressa Carrino 1Institute of Geosciences/University of Campinas, R. João Pandiá Calógeras, 51, 13083-870 Campinas-São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Alvaro Penteado Crósta; Alvaro Penteado Crósta † 1Institute of Geosciences/University of Campinas, R. João Pandiá Calógeras, 51, 13083-870 Campinas-São Paulo, Brazil †Corresponding author: e-mail, alvaro@ige.unicamp.br Search for other works by this author on: GSW Google Scholar Catarina Labouré Bemfica Toledo; Catarina Labouré Bemfica Toledo 2Institute of Geosciences/University of Brasília, Campus Universitário Darcy Ribeiro S/n, Asa Norte, 70910-900 Brasília – DF, Brazil Search for other works by this author on: GSW Google Scholar Adalene Moreira Silva; Adalene Moreira Silva 2Institute of Geosciences/University of Brasília, Campus Universitário Darcy Ribeiro S/n, Asa Norte, 70910-900 Brasília – DF, Brazil Search for other works by this author on: GSW Google Scholar Johann Lambert Silva Johann Lambert Silva 1Institute of Geosciences/University of Campinas, R. João Pandiá Calógeras, 51, 13083-870 Campinas-São Paulo, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Thais Andressa Carrino 1Institute of Geosciences/University of Campinas, R. João Pandiá Calógeras, 51, 13083-870 Campinas-São Paulo, Brazil Alvaro Penteado Crósta † 1Institute of Geosciences/University of Campinas, R. João Pandiá Calógeras, 51, 13083-870 Campinas-São Paulo, Brazil Catarina Labouré Bemfica Toledo 2Institute of Geosciences/University of Brasília, Campus Universitário Darcy Ribeiro S/n, Asa Norte, 70910-900 Brasília – DF, Brazil Adalene Moreira Silva 2Institute of Geosciences/University of Brasília, Campus Universitário Darcy Ribeiro S/n, Asa Norte, 70910-900 Brasília – DF, Brazil Johann Lambert Silva 1Institute of Geosciences/University of Campinas, R. João Pandiá Calógeras, 51, 13083-870 Campinas-São Paulo, Brazil †Corresponding author: e-mail, alvaro@ige.unicamp.br Publisher: Society of Economic Geologists Received: 30 Sep 2013 Accepted: 16 May 2014 First Online: 09 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 © 2015 Society of Economic Geologists. Economic Geology (2015) 110 (1): 73–90. https://doi.org/10.2113/econgeo.110.1.73 Article history Received: 30 Sep 2013 Accepted: 16 May 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Thais Andressa Carrino, Alvaro Penteado Crósta, Catarina Labouré Bemfica Toledo, Adalene Moreira Silva, Johann Lambert Silva; Geology and Hydrothermal Alteration of the Chapi Chiara Prospect and Nearby Targets, Southern Peru, Using ASTER Data and Reflectance Spectroscopy. Economic Geology 2015;; 110 (1): 73–90. doi: https://doi.org/10.2113/econgeo.110.1.73 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract Southern Peru contains several small- and medium-sized epithermal Au-Ag (± base metals) deposits related to Miocene-Pliocene metallogenetic belts. Specifically, the characterization of the geology and mapping of hydrothermal alteration zones of the Chapi Chiara prospect, Canahuire deposit, and Cerro Millo and San Antonio de Esquilache targets were done with data acquired by Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) spaceborne sensor. ASTER mapping techniques included (1) band ratio and principal component analysis (Crósta technique) applied to the visible and near-infrared and short-wave infrared bands to produce a regional hydrothermal alteration map (alunite and/or kaolinite, illite-muscovite and/or smectite, iron-bearing minerals) and (2) spectral indices and selective principal component analysis applied to the thermal infrared bands to detect quartz- and carbonates-bearing targets, respectively. These methods were used to establish a hydrothermal zoning pattern in paleostratovolcanoes, where the Chapi Chiara, Cerro Millo, and San Antonio de Esquilache targets are located. This zoning pattern was used to infer erosion conditions and the potential for metal deposits based on the mineralogy, which was also analyzed using reflectance spectroscopy and petrography. In addition, ASTER data were used to characterize the carbonate host rocks, the quartz-bearing units of the Yura Group, and the quartz-poor unit associated with the phreatic and phreatomagmatic breccias in the Canahuire deposit region. This characterization led to the development of a favorability model for the occurrence of “Canahuire-type” deposits based on spatial analysis using the fuzzy logic technique. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.