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Clay mineral variations associated with diagenesis and low-grade metamorphism of Early Cretaceous sediments in the Cameros Basin, Spain

Published online by Cambridge University Press:  09 July 2018

J. F. Barrenechea ,
M. Rodas  and
J. R. Mas
J. F. Barrenechea
Affiliation:
Dpto. de Cristalografia y Mineralogia, Facultad de Ciencias Geologicas, Universidad Complutense de Madrid, 28040 Madrid
M. Rodas
Affiliation:
Dpto. de Cristalografia y Mineralogia, Facultad de Ciencias Geologicas, Universidad Complutense de Madrid, 28040 Madrid
J. R. Mas
Affiliation:
Dpto. de Estratigrafia, Facultad de Ciencias Geologicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Abstract

The clay mineral distribution in the Early Cretaceous depositional sequences along the Cameros Basin has been established on the basis of XRD traces and TEM/EDAX analyses. Samples from the Latest Berriasian-Barremian depositional sequences are characteristic of epimetamorphic conditions. Illite ‘crystallinities’ are broader than expected (0.35–0.490°Δ2θ), due to the consistent presence of K-mica-paragonite mixed-layer and discrete paragonite associated with the illite 10 Å peak. The Late Barremian-Early Aptian depositional sequence, around the depocentral sector of the basin, represents a sudden change to anchimetamorphic conditions, marked by the presence of pyrophyllite and rectorite and by a significant decrease in the A1IV content of the chlorites. Towards the northwestern border of the basin, this sequence was affected by deep diagenetic conditions, as deduced from the clay mineral association and the ‘crystallinity’ values (0.57°Δ2θ). The changes in the clay mineral assemblages and ‘crystallinity’ data can hardly be explained in terms of the varying burial depth and are related to changes in the circulation of fluids associated with varying facies (modal composition, grain size). Permeability is regarded as the main factor controlling the circulation of these migratory fluids.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 2 , June 1995 , pp. 119 - 133
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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