@InProceedings{CostaPerrSilv:2017:RePrEs,
               author = "Costa, Manoel Augusto Correa da and Perrotta, Monica Mazzini and 
                         Silva, Anderson Dourado Rodrigues da",
                title = "Resultados preliminares de espectroscopia de reflect{\^a}ncia em 
                         testemunho de sondagem (AG-01) na regi{\~a}o da mina de Pb-Zn-Ag 
                         (Ba-Cu) do Perau, leste do Paran{\'a}, Cintur{\~a}o Ribeira, 
                         Prov{\'{\i}}ncia Mantiqueira",
            booktitle = "Anais...",
                 year = "2017",
               editor = "Gherardi, Douglas Francisco Marcolino and Arag{\~a}o, Luiz 
                         Eduardo Oliveira e Cruz de",
                pages = "5849--5856",
         organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 18. (SBSR)",
            publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
              address = "S{\~a}o Jos{\'e} dos Campos",
             abstract = "The Ribeira mobile belt in the Mantiqueira Province, southeastern 
                         Brazil, is historically known by the occurrence of important Pb-Zn 
                         deposits. The Perau Pb-Zn-Ag (Ba-Cu) deposit is interpreted as a 
                         sedimentary exhalative (SEDEX) system that was metamorphised at 
                         greenschist and amphibolite facies conditions. Here we present 
                         preliminary results on reflectance spectroscopy applied to mineral 
                         mapping of host rocks and alteration zones along the drill core 
                         AG-01 in the Perau mine. Visible and infrared (VNIR-SWIR; 0.4-2,5 
                         µm) lab spectroscopy was conducted using the ASD-FieldSpec-3 
                         Hi-Resolution spectrometer. Contact spectral measurements allowed 
                         the identification of distinct mineral groups, including 
                         Fe/Mg-chlorites and biotites, sericites (illite and muscovite), 
                         smectites (montmorillonite), amphiboles (hornblende and 
                         actinolite), Fe-carbonates and sulphates (gypsum). Gypsum was 
                         preliminarily identified in spectral mixtures dominated by 
                         Fe-carbonate absorption features. Compositional trends of Mg-rich 
                         chlorites (FeOH absorption < 2.248 µm) and phengitic sericites 
                         (AlOH absorption > 2.214 µm), as well as the presence of 
                         actinolite (secondary MgOH absorption < 2.386 µm) and Fe-carbonate 
                         (diagnostic Fe²+ absorption > 1.240 µm), are strongly correlated 
                         with hydrothermal alteration zones close to the Pb-Zn-Ag (Ba-Cu) 
                         ore body, and suggest a mineral system dominated by fluids rich in 
                         Fe, Mg and Ca. This mineral assemblage identified by reflectance 
                         spectroscopy is coherent with others SEDEX classic deposits in the 
                         world (e.g. HYC deposit, McArthur Basin, Australia), except by the 
                         dominant presence of Mg-rich chlorite in the proximal alteration 
                         zones.",
  conference-location = "Santos",
      conference-year = "28-31 maio 2017",
                 isbn = "978-85-17-00088-1",
                label = "59336",
             language = "pt",
         organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                  ibi = "8JMKD3MGP6W34M/3PSMBQQ",
                  url = "http://urlib.net/ibi/8JMKD3MGP6W34M/3PSMBQQ",
           targetfile = "59336.pdf",
                 type = "Geologia",
        urlaccessdate = "27 abr. 2024"
}