Integración de métodos geofísicos para el estudio de cavidades en el sistema kárstico de la Gruta de las Maravillas (Aracena)

  1. Francisco José Martínez-Moreno 1
  2. Jesús Galindo-Zaldívar 1
  3. Antonio Pedrera 1
  4. Teresa Teixido 1
  5. José Antonio Peña 1
  6. Lourdes González-Castillo 1
  7. Patricia Ruano 1
  8. Ana Ruiz- Constán 2
  9. Manuel López-Chicano 1
  10. Wenceslao Martín-Rosales 1
  11. Antonio Azor 1
  1. 1 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  2. 2 Instituto Geológico y Minero de España
    info

    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

Book:
Iberoamérica subterránea: CUEVATUR 2014, I Congreso Iberoamericano y V Congreso Español sobre Cuevas Turísticas
  1. Calaforra Chordi, José María (coord.)
  2. Durán Valsero, Juan José (coord.)

Publisher: Asociación de Cuevas Turísticas Española ; Instituto Geológico y Minero de España

ISBN: 978-84-617-1908-2

Year of publication: 2014

Pages: 361-372

Congress: Congreso Español sobre Cuevas Turísticas (5. 2014. Aracena)

Type: Conference paper

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Abstract

The karst system where is emplaced the Gruta de las Maravillas has been studied by the combination of geophysical methods. The cave, located in Cerro del Castillo hill, has been developed in marbles with intercalations of quartzites, granodiorites and gneiss, of the metamorphic Aracena band located along the contact between Ossa Morena Zone and South Portuguese Zone, in the Iberian Massif. The cave development is controlled by the presence of a mineralized band of pyrite and iron oxides that cross the marbles in N110ºE direction, near the contact with granodiorites. This band provides to the cavity special conditions of mineralization, with walls covered by iron oxides. In order to study the possible continuity of the Gruta de las Maravillas, different geophysical methods have been applied throughout the hill. As first approximation, it has performed a regional study with microgravity and microtopography in regular grid of 10 x 10 m. These measures have provided a residual anomaly map, which highlight negative values associated to negative density contrast probably due to the presence of unknown cavities. To confirm the existence of these cavities, it has been applied other geophysical methods on areas of interest: magnetic, electrical resistivity tomography, induced polarization, velocity and ray tracing profiles in seismic refraction, common offset in seismic reflection, and ground penetrating radar. The integration of these techniques has been carried out in profiles matching in the space with different lengths, reaching diverse depth and resolution. These methods have allowed, in one hand, define the anomalies related to cave detection on each applied methods and, in the other hand, confirm if the gravity anomalies are due to cavities or lithological changes. In this work it is proposed the possible continuity of the Gruta de las Maravillas toward other zones of the Cerro del Castillo.

Data source: Dialnet