Publication: Sedimentología y diagénesis de las secuencias lacustres someras en el área del yacimiento neolítico de Casa Montero (Vicálvaro, Madrid)
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Publication Date
2005
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Sociedad Geológica de España.
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Abstract
The sedimentary succession at Casa Montero flint archaeological site belongs to the green-clays unit of the Intermediate Unit of the Madrid Basin. A succession of silt-clay (mainly Mg-smectites), dolomite and silica rocks has been studied to know the sedimentary environment and diagene- tic processes around the site. The succession consists of silt-clay and carbonate sequences that represent a lacustrine environment with subaerial exposure events. The exposition events led to the development of a enlarged pseudomicrokarst in the topmost carbonate level. Vertisols were reworked at the top of the sequence. The diagenetic processes include early dolomitization of palustrine carbonates, partial transformation of the Mg-smectites and silicification of carbonates and clays in a groundwater environment. The presence of the archaeological site is due to the presence of opaline cherts with "aging" to quartz, that are uncommon in the silt-clay sequences of the Madrid Basin. The "aging" give these flints optimum properties for the Neolithic industry.