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Palygorskite occurrences in the Portuguese sector of the Tagus basin: a preliminary report

Published online by Cambridge University Press:  09 July 2018

I. Dias ,
I. Gonzalez ,
S. Prates  and
E. Galan
I. Dias
Affiliation:
Dpto. de Geología, Faculdade de Ciencias, Universidade de Lisboa, 1700 Lisboa, Portugal
I. Gonzalez
Affiliation:
Dpto. de Cristalografía y Mineralogía, Facultad de Química, Universidad de Sevilla, Apto. 553, 41071, Sevilla, Spain
S. Prates
Affiliation:
Dpto. de Geología, Faculdade de Ciencias, Universidade de Lisboa, 1700 Lisboa, Portugal
E. Galan
Affiliation:
Dpto. de Cristalografía y Mineralogía, Facultad de Química, Universidad de Sevilla, Apto. 553, 41071, Sevilla, Spain
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Extract

Palygorskite and sepiolite occurrences and deposits are frequent in the Iberian Peninsula, mainly in the Tagus basin, in central Spain and Portugal (Galán & Castillo, 1984).

In Portugal, the first palygorskite occurrence was reported by Carvalho (1964) in the region of Ponte do Sor, Tagus basin, in Paleogene sediments. Later, Carvalho (1968) reported palygorskite occurrences in coarse detrital sediments that were occasionally carbonatic or hardened by silicification, and built up the Cenozoic base for the Tagus and Sado basins. Carvalho referred to such formations as the 'Attapulgite complex'. Overlying this attapulgite complex is the 'Montmorillonite complex', probably of Miocene age.

Type
Notes
Information
Clay Minerals , Volume 32 , Issue 2 , June 1997 , pp. 323 - 328
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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