La Formación de Utrillas en el borde sur de la cuenca Vasco-Cantábrica: aspectos estratigráficos, mineralógicos y genéticos
DOI:
https://doi.org/10.3989/egeol.00565-6142Keywords:
Utrillas formation, river environment, tourmaline, provenance, clay minerals, diagenesisAbstract
The Utrillas formation, located in the southem border of the Basque-Cantabrian basin, is mainly composed of sandy materials deposited in a fluvial environment. Two informal units have been distinguished due to field data: a lower coarse-grained unit, interpreted as braider river channel-fills, and a upper fine-grained unit which suggests a meandering river environment. Mineralogy consists of quartz and phyllosilicates, with minor amounts of feldspars. The analysis of tourmalines has pointed two possible sources for these sediments: granitoids and low grade-metasediments. The identified clay minerals are mica and kaolinite. Texturals observations have pointed out an inherited origin for mica, while kaolinite is partly inherited and partly authigenic. This authigenic origin seems to be associated with the alteration of potassic feldspars during the stage of late diagenesis (telodiagenesis).
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Published
2000-12-30
How to Cite
Arostegui, J., Irabien, M. J., Sangüesa, J., & Zuluaga, M. C. (2000). La Formación de Utrillas en el borde sur de la cuenca Vasco-Cantábrica: aspectos estratigráficos, mineralógicos y genéticos. Estudios Geológicos, 56(5-6), 251–267. https://doi.org/10.3989/egeol.00565-6142
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