Paleoalteraciones de los depósitos de piedemonte cenozoicos del NE de Montes de Toledo, España
- Martín Rubí, Juan Antonio
- Martín-Serrano García, Ángel
- Cantano Martín, Mercedes
- Molina Ballesteros, Eloy
- Martín Banda, Raquel
- Rubio, A.
ISSN: 0366-0176
Year of publication: 2006
Volume: 117
Issue: 1
Pages: 525-530
Type: Article
More publications in: Boletín geológico y minero
Abstract
The articulation of the Toledo Mountains and the Tajo Basin is constituted by the Todelo Platform and the Los Yébenes Valley. This region corresponds to a differential typology paleorelief, which is filled by a thin Cenozoic cover. These deposits and the subadjacent basement are influenced by superimposed alterations. The paleoalterations show a geographic control that represents an important geochemical contrast between the acid West and the carbonated East of the Toledo Mountains. From the analysis of the grain size, chemistry and mineralogy of several profiles it has been defined a generalized hydromorphic alteration produced by hydrolysis and ferrolysis processes (no alkaline or acid conditions). Superimposed carbonations (alkaline conditions) are observed. These are the cause of the end of the previous processes, being more effective towards the basin (a possible Ca source). In many cases, these processes are functional, due to the remaining of the bad drainage conditions, which determine these alterations.