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		<issn>1516-697X</issn>
		<label>1068</label>
		<citationkey>AlmeidaFoMiraYama:1999:ReDeTo</citationkey>
		<title>Remote detection of a tonal anomaly in area of hydrocarbon microseepage, Tucano basin, north-eastern Brazil</title>
		<project>DSR</project>
		<year>1999</year>
		<secondarydate>19920220</secondarydate>
		<month>Sep.</month>
		<typeofwork>journal article</typeofwork>
		<secondarytype>PRE PN</secondarytype>
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		<size>542 KiB</size>
		<author>Almeida Filho, Raimundo,</author>
		<author>Miranda, Fernando Pelon de,</author>
		<author>Yamakawa, Tadashi,</author>
		<resumeid>8JMKD3MGP5W/3C9JJ4Q</resumeid>
		<group>DSR-INPE-MCT-BR</group>
		<affiliation>National Institute for Space Research-INPE, Caixa Postal 515</affiliation>
		<affiliation>Petrobras/CENPES, Cidade Univcrsitária, Ilha do Fund&#771;o, Q-7, Rio de Janeiro-RJ, Brazil</affiliation>
		<affiliation>Earth Resources Satellite Data Analysis Center-ERSDAC 3-12-1, Kachidoki Chuo-Ku, Tokyo 104, Japan</affiliation>
		<journal>International Journal of Remote Sensing</journal>
		<volume>20</volume>
		<number>13</number>
		<pages>2683-2688</pages>
		<transferableflag>1</transferableflag>
		<contenttype>External Contribution</contenttype>
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		<keywords>Gamma rays, Geochemistry, Hydrocarbons, Magnetic susceptibility, Radioactivity, Seepage, Hydrocarbon microseepage, Landsat-Thematic mapper, Radioactivity intensity, Soil gas, Tonal anomaly.</keywords>
		<abstract>Mapping of a tonal anomaly in an area of hydrocarbon microseepage was possible using a Landsat-Thematic Mapper false-colour composite consisting of TM2/3, TM4/3 and of the difference TW.3-TM4/3, displayed as red, green and blue respectively. In this false-colour composite, green and yellow express variations in the vegetation cover, whereas hues of magenta are related to terrain conditions representing bleached materials, which occur close to the centre of a soil gas anomaly. Simultaneous occurrence of anomalous soil gas values with magnetic and radioactive minerals suggests that a reducing environment associated with the microseepage phenomenon created the bleached materials, identified as a tonal anomaly in the enhanced TM image.</abstract>
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		<language>en</language>
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