Mineralogía de lutitas del "Garumniense" de la cuenca deTremp
- Autores: Joaquín Bastida Cuairan, Ángel M. López Buendía, J. Rosell, Rogelio Linares Santiago
- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 3, 1, 2001 (Ejemplar dedicado a: XIV Congreso Nacional de Sedimentología, IV Congreso del Cretácico de España), págs. 75-78
- Idioma: español
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Resumen
The Garumnian Red Beds of the Cretaceous-Tertiary boundary at the Tremp Basin (South Pyrenees, Ueida, Spain) consist from bottom to top of several units: Gray Garumnian (mixed carbonate - siliciclastic paralic deposits), Lower Red Garumnia (fluvial sediments mainly made of marls and sandstones), Vallecebre Limestones and equivalents (made of micritic lacustrine deposits) and Upper Red Garumnian (deposits related to fluvial and alluvial systems, made of marls, with sanstones, and occasionally limestones and evaporites). These deposits are overlayed by the Early Paleocene marine- transitional deposits, wich are also sampled. The main clay sheet silicates of the mineral assemblage in the marls are ±smectite, ±illite, ±kaolinite. The statistical analysis performed on XRD mineralogical data, show very low significative difefrences between marls for the different units, environments and related lithologies and are mainly the result of reworking of previous sediments and soils with an upwards climatic evolution to semi-arid to arid conditions;
no significative clay diagenesis has been observed.
