Mineralogía de arcillas y grado de diagénesis del Cretácico inferior, en el flanco sur del anticlinorio de Bilbao

J. Arostegui; F. Nieto; M. Ortega-Huertas; F. Velasco; M. C. Zuluaga

doi:10.3989/egeol.93495-6355

Mineralogía de arcillas y grado de diagénesis del Cretácico inferior, en el flanco sur del anticlinorio de Bilbao

Authors

J. Arostegui Dpto. de Mineralogía-Petrología. Facultad de Ciencias. Universidad del País Vasco
F. Nieto Dpto. de Mineralogía-Petrología. Facultad de Ciencias. Universidad de Granada
M. Ortega-Huertas Dpto. de Mineralogía-Petrología. Facultad de Ciencias. Universidad de Granada
F. Velasco Dpto. de Mineralogía-Petrología. Facultad de Ciencias. Universidad del País Vasco
M. C. Zuluaga Dpto. de Mineralogía-Petrología. Facultad de Ciencias. Universidad del País Vasco

DOI:

https://doi.org/10.3989/egeol.93495-6355

Keywords:

Basque-Cantabrian basin, clay minerals, illite/smectite, Kubler's index, inheritance, diagenesis

Abstract

The lower Cretaceous of the Bilbao Anticline is built up of a thick sequence of sediments. Three main sedimentary systems are been defined traditionally: Wealdian, Urgonian, and Supraurgonian ones. Pelitic facies were collected from four crossing sections to the structure. XRD was used to analyse the distribution of clay minerals, Kubler index (KI) and some illite crystallochemical parameters. Clay minerals are strongly source controlled. Illite/smectite interstratified distribution and KI, indicated a diagenetic grade which is increasing with deep of buria!' Middle and deep diagenetic grades are been identified and anchimetamophism in the most deeply buried samples of the central area, with no schistosity. Bearing in mind the maximum burial depth and vitrinite reflectance values, unusual presence of a R1 illite/smectite interstratified mineral has been detected in some samples.

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Published

1993-12-30

How to Cite

Arostegui, J., Nieto, F., Ortega-Huertas, M., Velasco, F., & Zuluaga, M. C. (1993). Mineralogía de arcillas y grado de diagénesis del Cretácico inferior, en el flanco sur del anticlinorio de Bilbao. Estudios Geológicos, 49(5-6), 277–286. https://doi.org/10.3989/egeol.93495-6355

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Issue

Vol. 49 No. 5-6 (1993)

Section

Articles

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