@InProceedings{PerrottaKlei:2017:EsReId,
               author = "Perrotta, Monica Mazzini and Klein, Evandro Luiz",
                title = "Espectroscopia de reflect{\^a}ncia na identifica{\c{c}}{\~a}o 
                         de assembleias minerais de altera{\c{c}}{\~a}o hidrotermal 
                         associadas a dep{\'o}sitos aur{\'{\i}}feros orog{\^e}nicos no 
                         Cintur{\~a}o Gurupi (MA/PA) - Brasil",
            booktitle = "Anais...",
                 year = "2017",
               editor = "Gherardi, Douglas Francisco Marcolino and Arag{\~a}o, Luiz 
                         Eduardo Oliveira e Cruz de",
                pages = "3939--3946",
         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 Rhyacian Chega Tudo Formation and the Troma{\'{\i}} 
                         Intrusive Suite, in the basement of the Neoproterozoic Gurupi 
                         Orogenic Belt, host several shear-zone related hydrothermal gold 
                         mineralizations considered as mesozonal orogenic gold deposits 
                         (Klein et al., 2005). Reflectance spectroscopy data, acquired by 
                         the ASD-FieldSpec-3 Hi-Resolution spectrometer in laboratory 
                         measurements applied to samples of predominantly felsic to 
                         intermediate volcanic rocks from the Chega Tudo Formation, and 
                         intermediate plutonic rocks from the Troma{\'{\i}} Intrusive 
                         Suite, were analyzed for the characterization of hydrothermal 
                         alteration mineralogical assemblages. The results demonstrate the 
                         efficiency of spectral analysis in identifying the typical mineral 
                         assemblages of the three main alteration zones related to orogenic 
                         gold systems. In the rocks of the Chega Tudo Formation 
                         volcanosedimentary sequence Fe/Mg-chlorite (+/- minor carbonate 
                         +/- minor sericite) were recognized in the distal or Chlorite 
                         zone; Fe-carbonate (+/- potassic to phengitic sericite +/- 
                         chlorite) in the intermediate or Carbonate zone; and phengitic or 
                         tending to phengitic sericite (+/- minor carbonate) in the 
                         proximal or White Mica-Pyrite zone. In the Chega Tudo volcanic 
                         sequence the distal zone is characterized by Fe or Fe/Mg-chlorite 
                         (+/- minor potassic sericite); the intermediate zone mineralogy 
                         includes muscovite associated to Fe-chlorite and rare carbonate; 
                         and the proximal zone is characterized by phengite (+/- minor 
                         Fe-chlorite). In the Troma{\'{\i}} Suite, hornblende and epidote 
                         from original or metamorphic paragenesis were recognized in 
                         association with Fe/Mg-Chlorite and tending to phengitic sericite 
                         in more unaltered rocks and distal zones while hornblende is 
                         absent in the more proximal zones dominated by phengitic 
                         sericite.",
  conference-location = "Santos",
      conference-year = "28-31 maio 2017",
                 isbn = "978-85-17-00088-1",
                label = "59291",
             language = "pt",
         organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                  ibi = "8JMKD3MGP6W34M/3PSM29E",
                  url = "http://urlib.net/ibi/8JMKD3MGP6W34M/3PSM29E",
           targetfile = "59291.pdf",
                 type = "Geologia",
        urlaccessdate = "27 abr. 2024"
}