Kaolinization processes in an area of Segovia (Spain)

Galán Emilio and López Aguayo F. and Brell J. M. and Doval M. and Liso M. J.: Kaolinization processes in an area of Segovia (Spain). In: Acta mineralogica-petrographica, (24). pp. 27-34. (1980)

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Abstract

In Vegas de Matute, South of Segovia, there is a kaolin deposit formed by weathering on Hercynian gneisses of the Spanish Central Massif, fossilized by the overlying Albian, which is also kaolinitic (sands and clays). Mineralogical differences (clay and heavy minerals) and differences in kaolinite crystallinity make it possible to distinguish between both types of kaolin (residual and sedimentary), even though the Albian kaolinitic sands are derived from the erosion of residual kaolins formed on acid rocks of the Central Massif, such as those fossilized in this deposit. Most of residual kaolin was probably eroded prior to Cretaceous times and the remaining kaolin was preserved as a deep crust because of poor drainage. The weathering profile is dominantly kaolinite near the top with the smectite content increasing with depth to a maximum of 60%. Sometime after the Cretaceous period some of the Albian kaolin was altered, in a basic environment, to smectite.

Item Type: Article
Journal or Publication Title: Acta mineralogica-petrographica
Date: 1980
Volume: 24
ISSN: 0365-8066
Page Range: pp. 27-34
Language: English
Publisher: University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Place of Publication: Szeged
Event Title: International Kaolin Symposium (10.) (1979) (Budapest)
Related URLs: http://acta.bibl.u-szeged.hu/39400/
Uncontrolled Keywords: Kőzettan, Ásványtan, Földtan
Additional Information: Bibliogr.: 34. p. ; ill. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.05. Earth and related environmental sciences
Date Deposited: 2016. Oct. 17. 09:25
Last Modified: 2022. Jul. 25. 12:59
URI: http://acta.bibl.u-szeged.hu/id/eprint/24669

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