Geoelectric Subsurface Characterization in the Emerged Portion of the Barra Falsa Channel using the Ground Conductivity Meter (LIN-EM), Bojuru, RS, Brazil
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La investigación geofísica en la región costera de la porción emergida de Barra Falsa, Bojuru, RS, Brasil, proporcionó información valiosa sobre la evolución deposicional y los cambios paleoambientales que ocurrieron durante el período Cuaternario. La combinación de estudios electromagnéticos, análisis de pozos estratigráficos, sísmica de reflexión de 3.5 kHz y datos geológicos previos permitió una caracterización integral de los entornos sedimentarios asociados con las fluctuaciones del nivel del mar. Los estudios electromagnéticos utilizando el método LIN-EM con el sistema Geonics EM34TM revelaron diferentes respuestas de conductividad en el subsuelo, que pudieron interpretarse en relación con eventos deposicionales. Se identificaron cinco intervalos de profundidad y se relacionaron con eventos específicos, como el cierre del canal Barra Falsa, el relleno estuarino y el ahogamiento del canal durante las transgresiones marinas. Además, la comparación de los resultados de los estudios electromagnéticos con los datos de pozos estratigráficos permitió la calibración de datos indirectos. Este enfoque multidisciplinario destaca la importancia de integrar técnicas geofísicas y geológicas para reconstruir la evolución del entorno costero a lo largo del tiempo. Este estudio proporciona una visión detallada de los cambios paleoambientales y deposicionales en la costa de Bojuru, demostrando cómo estas técnicas pueden contribuir significativamente a investigaciones futuras y a la gestión sostenible de áreas costeras. El conocimiento adquirido aquí es esencial para comprender la dinámica de las zonas costeras y las influencias de las variaciones del nivel del mar en la región del sur de Brasil.
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