Origin and diagenesis of calcretes in Upper Miocene limestones, southern Madrid basin, Spain
Different calcrete pro files are associated with lacustrine limestones in Upper Miocene formations on the south of the Madrid Basin. The limestones overlie mudstones which interfinger thin limestones beds and are also interbeded with sandy-filled channels. This set of underlying deposits represent a...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1991 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59496 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/59496 |
| Access Level: | acceso abierto |
| Palabra clave: | 552.5(460.27) (460.27)552.5 Calcretes Lacustrine limestones Upper Miocene Madrid Basin Perfiles de calcreta Calizas lacustres Mioceno Superior Cuenca de Madrid. Petrología |
| Sumario: | Different calcrete pro files are associated with lacustrine limestones in Upper Miocene formations on the south of the Madrid Basin. The limestones overlie mudstones which interfinger thin limestones beds and are also interbeded with sandy-filled channels. This set of underlying deposits represent a fluviallacustrine complex which evolved to a large shallow lake system. Two calcrete profiles, referred as ATS and MIR pro files, have been studied in detail. The profiles exhibit a typical zonation of diagenetic facies as follows: microsparite mosaics, massive calcrete with floating texture, horizons containing pisoliths with gravitational coatings and laminar crusts. These features have different development and vertical distribution in the studied profiles. Moreover, each profile shows particular features. Hollows and cavities filled by terrigenous and/or carbonate partic1es cemented by calcite are relevant in the ATS pro file whereas in the MIR substrate platy cavities were developed. These variations would be indicative of the different paleomorphological position of the areas where the calcretes were developed. |
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