Litificación de carbonatos lacustres Miocenos. Cuenca de Madrid:: ¿Implicaciones en el estudio de la diagénesis de carbonatos marinos calcíticos?.

• Autores: Esther Sanz Montero, V. Paul Wright, José Pedro Calvo Sorando, Ana María Alonso Zarza
• Localización: Geogaceta, ISSN 0213-683X, Nº. 13, 1992, págs. 115-119
• Idioma: español
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• Resumen

  • As a possible model for lacustrine carbonate diagenesls, and as a guide for understanding calcitedominated marine limestones, a range of indurated Miocene limestones from the Madrid Basin were studied. Despite very shallow burial and a calcitic precursor, the micrites and bioclasts underwent two phases of recrystallization. Initially the muds and bioclasts were recrystallized to a microporous uniform luminiscent micrite with complete loss of any primary fabric, possibly in a shallow suboxic phreatic zone. Subsequent exposure and karstificatión (probably in the early Pliocene) resulted in microspar/pseudospar formation causing induration. Low Mg calcite muds appear particularly susceptible to recrystallization