RT Journal Article T1 Caracterización petrológica de las magnesitas y las dolomías encajantes de edad Proterozoica Superior-Cámbrico Inferior, Grupo Ibor (Castañar de Ibor, Cáceres) T1 Petrology of magnesites and their dolomitic host rocks of Upper Proterozoic- Lower Cambrian age, Ibor Group(Castañar de Ibor, Cáceres) A1 Herrero Fernández, María J. A1 Martín Pérez, Andrea A1 Gil Peña, Inmaculada A1 Alonso Zarza, Ana María A1 Meléndez Hevia, Alfonso A1 Martín García, Rebeca AB Detailed petrographic observations of Upper Proterozoic -Lower Cambrian deposits of the Castañar de Ibor allows the characterization of the diagenetic history of these rocks. Craywackes, 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 produced the replacement of the dolostones and some siliciclastic beds. Finally a new dolomitisation phase produced replacement ofthe magnesite by dolomite and dolomite cementation YR 2010 FD 2010 LK http://hdl.handle.net/10272/7838 UL http://hdl.handle.net/10272/7838 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026