Caracterización petrológica de los niveles magnesíticos y las dolomías encajantes de Edad Proterozoica Superior- Cámbrico Inferior, Grupo Ibor, Castañar de Ibor, Cáceres

Abstract

Detailed petrographic observations of Upper Proterozoic –Lower Cambrian deposits of the Castañar de Ibor
allows the characterization of the diagenetic history of these rocks. Graywackes, shales and limestones were
deposited during the Upper Proterozoic-Lower Cambrian within a siliciclastic-carbonatic marine platform.
Dolomite replaced mostly limestones, but also cemented the siliciclastic deposits. Later on magnesium-rich
fluids circulating along stylolites, bedding planes and fractures partially replaced the dolostones and some
siliciclastic beds. Finally, a new dolomitisation phase produced replacement of the magnesite by dolomite and
dolomite cementation.