La Formación de Utrillas en el borde sur de la cuenca Vasco-Cantábrica: aspectos estratigráficos, mineralógicos y genéticos

J. Arostegui; M. J. Irabien; J. Sangüesa; M. C. Zuluaga

doi:10.3989/egeol.00565-6142

La Formación de Utrillas en el borde sur de la cuenca Vasco-Cantábrica: aspectos estratigráficos, mineralógicos y genéticos

Authors

J. Arostegui Dpto. Mineralogía-Petrología. Universidad del País Vasco
M. J. Irabien Dpto. Mineralogía-Petrología. Universidad del País Vasco
J. Sangüesa Dpto. Mineralogía-Petrología. Universidad del País Vasco
M. C. Zuluaga Dpto. Mineralogía-Petrología. Universidad del País Vasco

DOI:

https://doi.org/10.3989/egeol.00565-6142

Keywords:

Utrillas formation, river environment, tourmaline, provenance, clay minerals, diagenesis

Abstract

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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Issue

Vol. 56 No. 5-6 (2000)

Section

Articles

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