Caracterización petrológica de las magnesitas y las dolomías encajantes de edad Proterozoica Superior-Cámbrico Inferior, Grupo Ibor (Castañar de Ibor, Cáceres)
- Herrero Fernández, María Josefa
- Martín-Pérez, Andrea
- Gil-Peña, I.
- Alonso Zarza, Ana María
- Meléndez Hevia, Alfonso
- Martín-García, Rebeca
ISSN: 0213-683X
Year of publication: 2010
Issue: 48
Pages: 143-146
Type: Article
More publications in: Geogaceta
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 produced the replacement of the dolostones and some siliciclastic beds. Finally, a new dolomitisation phase produced replacement of the magnesite by dolomite and dolomite cementation.