@InProceedings{HernandezSouz:2013:NeCoDe,
               author = "Hernandez, Emanuel Amorer and Souza Filho, Carlos Roberto de",
                title = "Spectral reflectance and emissivity features of PO4-bearing 
                         carbonatitic rocks from the Catal{\~a}o I and Tapira complexes: 
                         New constraints for detection of igneous phosphates with remote 
                         sensing data",
            booktitle = "Anais...",
                 year = "2013",
               editor = "Epiphanio, Jos{\'e} Carlos Neves and Galv{\~a}o, L{\^e}nio 
                         Soares",
                pages = "3595--3602",
         organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 16. (SBSR)",
            publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
              address = "S{\~a}o Jos{\'e} dos Campos",
             abstract = "In order to determine the feasibility of conducting remote sensing 
                         of igneous phosphate rocks, reflectance and diffuse reflectance 
                         measurements were performed on eight samples from the Tapira and 
                         Catal{\~a}o I Carbonatitic Alkaline complexes. Groundtruthing was 
                         performed with X-Ray Fluorescence and X-Ray Diffraction. Samples 
                         were collected from different parts of the weathering mantle until 
                         the bottom of the mine pits, showing better-preserved rock 
                         structure in this area. Samples were also dried and milled until 
                         200mesh size. Reflectance measurements were made with an ASD 
                         Fieldspec 3 High-Resolution spectrometer in laboratory conditions. 
                         Diffuse Reflectance measurements were made with a FTIR Nicolet 
                         Nexus 6700 Spectrometer, and then Kirchoffs Law was applied to 
                         calculate emissivity. From the analyzed data, it can be observed 
                         that most samples that bear more than enough phosphate content to 
                         be mined show diagnostic REE absorption features in the VIS region 
                         of the spectra when the CaO/P2O5 ratio is higher than 1,0. 
                         However, mineralogical associations of phlogopite, vermiculite, 
                         calcite and dolomite in the SWIR region are significant in 
                         identifying the samples as carbonatitic rocks from the APIP. Also, 
                         emissivity results recorded a distinctive v3 broad absorption 
                         feature at 8,2\μm for pure apatite from the Catal{\~a}o I 
                         Complex and this absorption feature was consistently featured for 
                         the other samples studied. The results are in accordance with 
                         previous results obtained for other carbonatitic complexes in 
                         Mountain Pass (USA) and Kaneshin (AFG), for Carbonatitic Complexes 
                         with different ages.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "13-18 abr. 2013",
                 isbn = "{978-85-17-00066-9 (Internet)} and {978-85-17-00065-2 (DVD)}",
                label = "420",
             language = "en",
         organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                  ibi = "3ERPFQRTRW34M/3E7GD9D",
                  url = "http://urlib.net/ibi/3ERPFQRTRW34M/3E7GD9D",
           targetfile = "p0420.pdf",
                 type = "Geologia",
        urlaccessdate = "11 maio 2024"
}