Structure of a complex carbonate aquifer by magnetic, gravity and TDEM prospecting in the Jaén area, Southern Spain

Authors

  • A. RUIZ-CONSTÁN Instituto Geológico y Minero de España (IGME). Urb. Alcázar del Genil 4, Edificio Zulema, 18006 Granada, Spain.
  • A. PEDRERA Instituto Andaluz de Ciencias de la Tierra (CSIC). Avda. de Las Palmeras 4, 18100 Granada, Spain.
  • S. MARTOS-ROSILLO Instituto Geológico y Minero de España (IGME). Urb. Alcázar del Genil 4, Edificio Zulema, 18006 Granada, Spain.
  • J. GALINDO ZALDÍVAR Instituto Andaluz de Ciencias de la Tierra (CSIC). Avda. de Las Palmeras 4, 18100 Granada, Spain. Departamento de Geodinámica, Universidad de Granada. Campus Fuentenueva s/n, 18071 Granada, Spain.
  • C. MARTÍN-MONTAÑÉS Instituto Geológico y Minero de España (IGME). Urb. Alcázar del Genil 4, Edificio Zulema, 18006 Granada, Spain.
  • J.P. GONZÁÑEZ DE AGUILAR Instituto Geológico y Minero de España (IGME). Urb. Alcázar del Genil 4, Edificio Zulema, 18006 Granada, Spain.

Keywords:

Carbonate aquifer, Potential field research, Electromagnetic prospecting, Betic Cordillera, Groundwater resources, Hydrogeological continuity

Abstract

Knowledge of aquifer geometry is essential for efficient and sustainable groundwater management, particularly in carbonate aquifers due to uncertainties inherent to karstic systems. The geological structure and hydrogeological continuity of Los Chotos-Sazadilla-Los Nacimientos and La Serreta-Gante-Cabeza Montosa carbonate aquifers (Jaén; SE Spain) have been established through structural measurements, geophysical prospecting –magnetic, gravity and time-domain electromagnetics (TDEM)– and the study of piezometric levels. Yet the scarce hydrogeological data, the complexity of the tectonic structure and the presence of Plio-Quaternary rocks covering the highly permeable carbonate rocks make it difficult to establish a robust conceptual hydrogeological model of the aquifer. This study focuses on an area where hydrogeological disconnection between the two aquifers was traditionally assumed, given the diapiric emplacement of low permeable rocks between them. The new geophysical data demonstrate connection between aquifers that implies greater groundwater reserves than previously supposed. This field example supports the suitability of the combined use of electromagnetic methods with gravity and magnetic research that have been poorly combined up to recent times for hydrogeological studies.

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Published

2015-07-08

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