Perfiles paleokarsticos en el techo de la unidad intermedia del mioceno de la cuenca de Madrid

J. C. Cañaveras; S. Sánchez-Moral; S. Sánchez-Moral; S. Ordóñez; S. Ordóñez; J. P. Calvo; J. P. Calvo

doi:10.3989/egeol.03591-482

Perfiles paleokarsticos en el techo de la unidad intermedia del mioceno de la cuenca de Madrid

Authors

J. C. Cañaveras Departamento de Ciencias de la Tierra y del Medio Ambiente. Facultad de Ciencias. Universidad de Alicante.
S. Sánchez-Moral Departamento de Geología. Museo Nacional de Ciencias Naturales. CSIC. Madrid
S. Sánchez-Moral Departamento de Geología. Museo Nacional de Ciencias Naturales. CSIC. Madrid
S. Ordóñez Departamento de Ciencias de la Tierra y del Medio Ambiente. Facultad de Ciencias. Universidad de Alicante.
S. Ordóñez Departamento de Ciencias de la Tierra y del Medio Ambiente. Facultad de Ciencias. Universidad de Alicante.
J. P. Calvo Departamento de Petrología y Geoquímica. Facultad de Ciencias Geológicas. UCM. Madrid
J. P. Calvo Departamento de Petrología y Geoquímica. Facultad de Ciencias Geológicas. UCM. Madrid

DOI:

https://doi.org/10.3989/egeol.03591-482

Keywords:

Paleokarst, meteoric diagenesis, Miocene, Madrid Basin

Abstract

An intra-Vallesian (Upper Miocene) paleokarst developed at the top of the Intermediate Miocene Unit in the continental Madrid basin is recognized. This paleokarst is a early shallow, tabular-shaped karst that shows a marked control by the depositional facies pattern and lithologies. By integrating morphological, petrological and geochemica1 data, three hydrogeological or environmental zones have been established throughout the paleokarstic profiles: (i) a vadose zone, characterized by vertically elongated caves and discontinuous speleothems and vadose cements (ii) a 3-7 m thick water table fringe, characterized by the wide development of stratiform breccia bodies, the superimposition of both vadose and phreatic features, and the lowest Fe and Mn contents in host-rock carbonates; and (iii) a phreatic zone characterized by an increase of 6I3C values and the predominance of phreatic cementation. The paleogeographic reconstruction for the intra-Vallesian paleokarst using paleokarstic profiles reveals relative topographic highs to the north and topographic lows to the south drawing the paleokarst landscape.

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Published

2003-08-30

How to Cite

Cañaveras, J. C., Sánchez-Moral, S., Sánchez-Moral, S., Ordóñez, S., Ordóñez, S., Calvo, J. P., & Calvo, J. P. (2003). Perfiles paleokarsticos en el techo de la unidad intermedia del mioceno de la cuenca de Madrid. Estudios Geológicos, 59(1-4), 53–66. https://doi.org/10.3989/egeol.03591-482

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Issue

Vol. 59 No. 1-4 (2003)

Section

Articles

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