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GEOREF RECORD

Characteristics of a Mg-palygorskite in Miocene rocks, Madrid Basin, Spain

E. Garcia Romero, M. Suarez Barrios and M. A. Bustillo Revuelta
Characteristics of a Mg-palygorskite in Miocene rocks, Madrid Basin, Spain
Clays and Clay Minerals (August 2004) 52 (4): 484-494

Abstract

Palygorskite in Miocene mudstones, palustrine limestones and calcretes from the Esquivias locality (Madrid Basin, Spain) has been analyzed by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and analytical electron microscopy to determine its characteristics and chemical composition. Other palygorskites from the literature are used as references. The mean structural formula obtained from the analysis of isolated particles is (Si (sub 7.87) Al (sub 0.13) )O (sub 20) (Al (sub 1.04) Fe (super 3+) (sub 0.20) Mg (sub 3.11) []0.65) (OH) (sub 2) (OH (sub 2) ) (sub 4) (Ca (sub 0.02) K (sub 0.05) Na (sub 0.08) ). This palygorskite has the largest Mg content reported in the literature, and it seems that, chemically, it fills the "compositional gap" existing between sepiolite and palygorskite. Infrared spectroscopy reveals the absence of trioctahedral Mg and therefore the possibility of the existence of magnesic clusters in the ribbons is discounted. An homogeneous distribution of the octahedral cations (Al, Fe (super 3+) and Mg) along the ribbons is proposed.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 52
Serial Issue: 4
Title: Characteristics of a Mg-palygorskite in Miocene rocks, Madrid Basin, Spain
Affiliation: Universidad Complutense, Departamento de Cristalografia y Mineralogia, Madrid, Spain
Pages: 484-494
Published: 200408
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 40
Accession Number: 2005-000643
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: Universidad de Salamanca, ESP, SpainCSIC, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200501
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