RT Journal Article
T1 Datos geofísicos y evolución sedimentaria de la Depresión de laJanda (Cádiz)
A1 Luque, Luis de
A1 Silva Barroso, Pablo Gabriel
A1 Zazo Cardeña, Caridad
A1 Recio, J.M.
A1 Carrasco, P.
A1 Goy Goy, José Luis
A1 Dueñas, M.I.
A1 Lario, Javier
A1 Dabrio González, Cristino José
A1 González Hernández, F.M.
A1 Poza, L.
AB La Janda lake is located into a tectonic graben filled by Pleistocene and Holocene f1uvio-marine sediments.Geophysical survey consisting on Electric-Iogs and seismic refraction profiles aimed to determining thethickness of Quaternary sediments infilling the graben. Nevertheless, the results are significantly distortedby a saline aquifer that occupies most of the sedimentary filling. In any case it is possible to identify anassymetric subsident area reaching up to 300 m depth, characterised by very low apparent resistivities(1.5-2.4 W/m). This thick geoelectrical unit can be preliminary subdivided into 3 different subunits herecalled A, B 1, B2, characterised by resistivity differences. The shallow 4-6 m thick Unit A consists of a thinlacustrine and alluvial e/ay and silts of Holocene age easily recognized in seismic refraction profiles anddrill cores. Unit B can be separated in two subunits; Both are saturated in brackish or saline waters; B1 isa 20-40 m thick unit that thins northward and correspond to the Plio-Pleistocene, B2 is a slightly moreresistive unit that extends from this depth to 352 m and corresponds to deeply weathered mio-pliocenesandstones. The upper part of Sub-unit B1 correspond to estuarine sands recorded in a previous corewhich deposition finishes at ca. 3810 cal BP. A sharp normal fault limits the southern part of La Jandaassymetric graben.
PB Sociedad Geológica de España
SN 0213-683X
YR 2001
FD 2001
LK https://hdl.handle.net/20.500.14352/56872
UL https://hdl.handle.net/20.500.14352/56872
LA spa
DS Docta Complutense
RD 7 abr 2025