Caracterización de cloritoides de la Sierra de Los Cameros (Soria-La Rioja): primeros datos analíticos
- María Pilar Mata Campo
- Félix Pérez Lorente
- Jesús Soriano Carrillo
- Francisco López-Aguayo
ISSN: 0210-6558
Year of publication: 1990
Volume: 13
Issue: 0
Pages: 35-41
Type: Article
More publications in: Boletín de la Sociedad Española de Mineralogía
Abstract
The “Cameros ridge” is constituted by materials of Lower Cretaceous age in Wealdian facies. It correponds at one thick serie of continental sediments of fluvio-deltaic origin. The samples studied are located in the clastic group named “Urbion group”. The mineralogical association is built by: quartz, muscovite, chloritoid, chlorite, calcite, paragonite and pyrite. As accessory minerals appear tourmaline, iron oxides, zircon, apatite and rutil. The chloritoid can be detected in different lithological levels. The optical study shows the chloritoid crystals have prismatic habit with the characteristic pleochroism of ferous terms and sizes between 0.05 mm. and 0.10 mm., They are triclinic. The EDAX and electron-microprobe analysis shows the chloritoid crystals are practically ferrous, without zonations, neither important chemical differences between them.