Fault-hosted palygorskite from the Serrata de Níjar deformation zone (SE Spain)
García-Romero, E. (Universidad Complutense de Madrid. Departamento de Cristalografía y Mineralogía)
Suárez, M. (Universidad de Salamanca. Departamento de Geología)
Oyarzun, R. (Universidad Complutense de Madrid. Departamento de Cristalografía y Mineralogía)
López-García, J. A. (Universidad Complutense de Madrid. Departamento de Cristalografía y Mineralogía)
Regueiro, M. (Instituto Geológico y Minero de España)

Fecha:	2006
Resumen:	Palygorskite fibers growing along fault planes in the outcrops of a large fault zone in SE Spain (Carboneras Fault Zone: CFZ; Serrata de Nijar) were studied by X-ray diffraction, scanning electron microscopy-energy dispersive X-ray analysis, and transmission electron microscopy-analytical electron microscopy. The structural formulae, calculated per half unit-cell, is: SiAlO(Al FeMg) (OH)(OH)Na KCa4(HO). The samples have minor tetrahedral substitutions, with Mg/Al ratios close to one, and contain very small amounts of Fe. The number of octahedral cations per half unit-cell is 3. 93. The fault-hosted palygorskite shows macroscopic ductile features including incipient foliation. Based on field and laboratory observations, as well as on regional geological evidence indicating the existence of widespread hydrothermal processes along the Serrata de Nijar and surrounding areas, we suggest that palygorskite may have formed during ongoing deformation in the CFZ, as a precipitate from Mg-rich hydrothermal fluids. Copyright © 2006, The Clay Minerals Society.
Nota:	Altres Ajuts: Junta de Castilla y Leon (Grant SA017A05) i Universidad Complutense (Grant 910386)
Derechos:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Fault Gouge ; Fault Zone ; Macroscopic Palygorskite ; Serrata de Nijar ; Smectite ; Spain
Publicado en:	Clays and Clay Minerals, Vol. 54, Núm. 3 (2006) , p. 324-332, ISSN 1552-8367

DOI: 10.1346/CCMN.2006.0540304

9 p, 2.0 MB  Acceso restringido a la UAB

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