Diagenesis of the Central Basque-Cantabrian Basin (Iberian Peninsula) based on Illite-Smectite Distribution
- Aróstegui, J.
- Zuluaga, M. C.
- Velasco, F.
- Ortega-Huertas, M.
- Nieto, F.
DOIAbstract
14 páginas, 8 figurasX-ray diffraction was used to analyse the distribution of clay minerals in the <2μ fraction of the lutitic and marly facies from the centre of the Basque-Cantabrian Basin (Basque Arc), Where the sedimentary section is 2000 to 10000 m thick. Most of the deposits were laid down during the Cretaceous and Paleogene and were related to the opening and closing of the Bay of Biscay. The most noteworthy variations are in kaolinite, smectite and mixed-layered (R0=, R=1 and R≥3) illite-smectite, which can be ascribed both to provenance and to diagenesis. A general diminution in expandability is related to the gradual transformation of smectite to illite from south to north, and with depth. Temperature, residence time and chemical...
Add to ORKG