@Article{AlmeidaFoMiraGalvFrei:2002:TeChTo,
               author = "Almeida Filho, Raimundo and Miranda, Fernando Pelon and 
                         Galv{\~a}o, L{\^e}nio Soares and Freitas, Corina da Costa",
          affiliation = "{} and Petrobras/CENPE Cidade Universit{\'a}ria, Ilha do 
                         Fund{\~a}o, Q-7, Rio de Janeiro-RJ, Brazil",
                title = "Terrain characteristics of a tonal anomaly remotely detected in an 
                         area of hydrocarbon microseepage, Tucano Basin, north-eastern 
                         Brazil",
              journal = "International Journal of Remote Sensing",
                 year = "2002",
               volume = "23",
               number = "18",
                pages = "3893--3898",
                month = "Sep.",
             keywords = ": Geochemistry, Hydrocarbons, Magnetic susceptibility, 
                         Radioactivity, Seepage, Soils, Soil spectra absorption band, 
                         Remote sensing, anomaly, hydrocarbon, image classification, 
                         Landsat thematic mapper, remote sensing, seepage, Brazil.",
             abstract = "This study reports the geological characteristics of a tonal 
                         anomaly in an area of hydrocarbon microseepage, identified in 
                         Landsat-5 Thematic Mapper (TM)images. A diversified dataset was 
                         gathered, which included soil gas geochemistry determinations, 
                         soil radioactivity intensity and soil magnetic susceptibility 
                         measurements, as well as laboratory soil spectra. Data indicated 
                         that the tonal anomaly holds a higher concentration of gaseous 
                         hydrocarbons in soils than the surroundings, accompanied by 
                         enrichment in radioactive minerals. However, there is no 
                         definitive evidence of magnetic mineral enrichment inside the 
                         tonal anomaly compared with the surroundings. An intense 
                         silicification process, characterized by a cover of fine-grained 
                         silicified cobbles and boulders, seems to be responsible for 
                         inhibiting the development of diagenetic clay mineralization, as 
                         indicated by variations in the depth of the 2200 nm soil spectra 
                         absorption band.",
           copyholder = "SID/SCD",
                  doi = "10.1080/01431160210137695",
                  url = "http://dx.doi.org/10.1080/01431160210137695",
                 issn = "0143-1161",
                label = "10213",
             language = "en",
           targetfile = "INPE 9069.pdf",
        urlaccessdate = "05 maio 2024"
}