Caracterización petrológica de las magnesitas y las dolomías encajantes de edad Proterozoica Superior-Cámbrico Inferior, Grupo Ibor (Castañar de Ibor, Cáceres)

• Autores: María Josefa Herrero Fernández, Andrea Martín-Pérez, I. Gil-Peña, Ana María Alonso Zarza, Alfonso Meléndez Hevia, Rebeca Martín-García
• Localización: Geogaceta, ISSN 0213-683X, Nº. 48, 2010, págs. 143-146
• Idioma: español
• Enlaces
  • Texto completo
• Resumen

  • 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.