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BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA http://dx.doi.org/10.18268/BSGM2011v63n1a9 |
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Imágenes Landsat TM y modelo digital de elevación para la identificación de lineamientos y mapeo litológico en Punta Mita (México)
Landsat TM images and digital elevation model applied to the identification of lineaments and lithological mapping at Punta Mita (Mexico)
Thamara Fernández de la Vega–Márquez1,*, Rosa María Prol–Ledesma2
1 Facultad de Filosofía y Letras, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México, D.F.
2 Instituto de Geofísica, Depto. Recursos Naturales, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, México, D.F.
* This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
Intense hydrothermal activity has been reported recently in the Punta Mita area. This activity occurs as focused and diffuse discharge of gas and hot water from the ocean bottom. In order to explain the presence of this geothermal activity, the tectonic and geologic characteristics of the area have been studied. As part of these studies, the digital elevation model and multispectral images of Punta Mita were processed to identify the main geological structures. The results obtained from the DEM and image processing were compared with the field truth and previously reported geological maps. The use of directional filters and principal components, as well as the morpho–hydrogeologic analysis of the drainage pattern, provided useful information to construct a detailed geological map of Punta Mita. The lineaments are arranged in four systems, according to their abundance: N 0°–10° E; N 40°–50° E; N 70°–80° E and N 40°–60° W, the second one is the one related with the submarine hydrothermal discharge and coincides with the emplacement of basaltic dykes in the area.
Keywords: Digital enhancement, principal components, Banderas Bay, Jalisco block.
