Abstract
In this work we focus on the dolomitization processes which affected the southeastern sector of Picos de Europa Unit. The dolostones formed consequently with this process are rocks with a varied and irregular geometry, wich reminds that observed in intrusive rocks. Their chemical composition show a slight excess of calcium in relation to stoichiometric dolomite. Their iron and strontium contents are low in relation to other comparable dolomites. The abundance of dolostones is much bigger at the Frontal Unit than in upper structural Units. The dolomitization processes respond to an epigenetic dolomitization model and they are previous to the formation of Pb-Zn orebodies. We suggest a per ascensum dolomitization model tiggered by formation waters of the Pisuerga-Carrion Unit. With regard to age, the dolomitization was later than Lower Estephanian B and possibly earlier than some undetermined time during the Permian.
Highlights
In this work we focus on the dolomitization processes which affected the southeastern sector of Picos de Europa Unit
The dolomitization processes respond to an epigenetic dolomitization model and they are previous to the formation of Pb-Zn orebodies
We suggest a per ascensum dolomitization model tiggered by formation waters of the Pisuerga-Carrion Unit
Summary
Cal izas Calizas Calizas Dolom i ti zaciones Fm Lebeña (5.5Inorog.) Cuaternario y cubierto Falla Cabalgamiento. Se, la de Picos de Europa, lo hizo durante el Estefaniense B inferior, cabalgando sobre la región de Pisuerga-Carrión. La región de Picos de Europa está caracterizada por la presencia de sucesivos cabalgamientos de dirección E-W, los cuales propician la existencia de un imbricado de mantos, en cada uno de los cuales está presente la mayor parte de la serie estratigráfica Carbonífera. Otro rasgo importante en la región es la existencia de un sistema de fallas subverticales de dirección N lOS-l20oE, que tuvo su origen al final de la orogenia Hercínica (Marquínez, 1978). El objetivo de este trabajo es la descripción y el estudio de las dolomías del sector Sudeste de Picos de Europa. El trabajo desarrollado en el campo incluye la realización de la cartografía geológica y toma de muestras para estudio microscópico y para análisis químico.
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