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Minerals 2019, 9(1), 40;

Evolution of Clays in Cretaceous Marly Series (Álava Block, Basque Cantabrian Basin, Spain): Diagenesis and Detrital Input Control

Departamento de Mineralogía y Petrología, Facultad de Ciencia y Tecnología, Universidad del País Vasco/EHU, Apdo. 644, 48080 Bilbao, Spain
CAI de Técnicas Geológicas, Universidad Complutense de Madrid, C/ José Antonio Novais no. 2, 28040 Madrid, Spain
Departamento de Mineralogía y Petrología, IACT, Universidad de Granada-CSIC, Av. Fuentenueva s/n, 18002 Granada, Spain
IUCA-Facultad de Ciencias, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
Author to whom correspondence should be addressed.
Received: 10 October 2018 / Revised: 26 December 2018 / Accepted: 4 January 2019 / Published: 12 January 2019
(This article belongs to the Special Issue From Diagenesis to Low-Grade Metamorphism)
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Two stratigraphic sections of carbonate sediments with significant thickness differences and without appreciable tectonic deformation were studied near the trough and on a threshold zone at the Álava Trough. Such characteristics make them appropriate to analyze the influence of a slow progression of the diagenesis over the original clay suite. X Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Analytical Electron Microscopy (AEM) techniques were applied in natural and alkylammonium-treated samples. Diagenesis slightly modified the clay mineralogy, the disappearance of smectite, and the variation in the content and ordering of the I/S mixed layer, with burial being the most noteworthy process. The total charge in the 2:1 expandable layers of smectite and I/S shows a slight increase, preferentially located on tetrahedral sheets, with depth. The data suggest a moderate diagenesis grade for the studied materials. The combination of techniques allowed identification of several types of detrital micaceous phases, as well-crystallized K-rich micas, Na-K micas, mica-chlorite stacks, and illites, with an expandable behaviour after the alkylammonium treatment. The total charge of illites did not change with diagenesis, suggesting their detrital origin. This research shows that the detrital assemblage masks the diagenetic evolution in the basin, which indicates the importance of the combination of different techniques to infer correctly the diagenetic grade in a sedimentary basin. View Full-Text
Keywords: Marls; diagenesis; inherited minerals; mixed layers; layer charge; illitization Marls; diagenesis; inherited minerals; mixed layers; layer charge; illitization

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Arostegui, J.; Arroyo, X.; Nieto, F.; Bauluz, B. Evolution of Clays in Cretaceous Marly Series (Álava Block, Basque Cantabrian Basin, Spain): Diagenesis and Detrital Input Control. Minerals 2019, 9, 40.

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