Geology And Hydrothermal Alteration Of The Chapi Chiara Prospect And Nearby Targets, Southern Peru, Using Aster Data And Reflectance Spectroscopy

dc.creatorCarrino
dc.creatorThais Andressa; Crosta
dc.creatorAlvaro Penteado; Bemfica Toledo
dc.creatorCatarina Laboure; Silva
dc.creatorAdalene Moreira; Silva
dc.creatorJohann Lambert
dc.date2015-JAN-FEB
dc.date2016-06-07T13:14:55Z
dc.date2016-06-07T13:14:55Z
dc.date.accessioned2018-03-29T01:35:39Z
dc.date.available2018-03-29T01:35:39Z
dc.identifier
dc.identifierGeology And Hydrothermal Alteration Of The Chapi Chiara Prospect And Nearby Targets, Southern Peru, Using Aster Data And Reflectance Spectroscopy. Soc Economic Geologists, Inc, v. 110, p. 73-90 JAN-FEB-2015.
dc.identifier0361-0128
dc.identifierWOS:000349056100004
dc.identifier
dc.identifierhttp://econgeol.geoscienceworld.org/content/110/1/73
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/241745
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1305443
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionSouthern 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 (Crosta 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.
dc.description110
dc.description1
dc.description
dc.description73
dc.description90
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionNational Council for Scientific and Technological Development
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFAPESP [2011/00106-8]
dc.description
dc.description
dc.description
dc.languageen
dc.publisherSOC ECONOMIC GEOLOGISTS, INC
dc.publisher
dc.publisherLITTLETON
dc.relationECONOMIC GEOLOGY
dc.rightsfechado
dc.sourceWOS
dc.subjectPrincipal Component Analysis
dc.subjectSpaceborne Thermal Emission
dc.subjectAlteration Minerals
dc.subjectOrcopampa-district
dc.subjectSpectral-analysis
dc.subjectAltered Rocks
dc.subjectArgentina
dc.subjectEvolution
dc.subjectPatagonia
dc.subjectDeposit
dc.titleGeology And Hydrothermal Alteration Of The Chapi Chiara Prospect And Nearby Targets, Southern Peru, Using Aster Data And Reflectance Spectroscopy
dc.typeArtículos de revistas


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