Resumen de Caracterización de la geometría de la Fosa de Navamuño (Sistema Central Español) aplicando técnicas geofísicas
Rosa María Carrasco González, Jesús Sánchez Vizcaíno, Alfonso Muñoz Martín, Javier de Pedraza Gilsanz, David Domínguez Villar, María Blanca Ruiz Zapata, Daniel Abel Schaad
The Navamuño basin, located in the high sector of the Cuerpo de Hombre valley (Sierra de Bejar), was partly occupied by a glacier during the Late Pleistocene. The basin is a ~ 14 Ha pseudoendorheic depression with boundaries controlled by fault lineaments and the left lateral moraine of the Cuerpo de Hombre paleoglacier. The geometry of the base of the basin and the thickness of sediments that contain were studied together with the relationship of these deposits with the structural elements and moraine sediments bordering the basin. Eight 2D electrical resistivity tomography sections were acquired by nine vertical electrical sounding logs. Although heterogeneous, the maximum thickness of the deposit filling the basin is of approximately 20 m in some sectors, with electro-layers under the surficial soil. The depression is interpreted as a subsidence basin fill with fluvioglaciar and fluviotorrential deposits with episodes of local shallow pond/bog peat sedimentation that was controlled by the fractures affecting the granite.
