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Clays and Clay Minerals; June 2006; v. 54; no. 3; p. 324-332; DOI: 10.1346/CCMN.2006.0540304
© 2006 Clay Minerals Society
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FAULT-HOSTED PALYGORSKITE FROM THE SERRATA DE NÍJAR DEFORMATION ZONE (SE SPAIN)

E. García-Romero1,*, M. Suárez2, R. Oyarzun1, J. A. López-García1 and M. Regueiro1,3

1 Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense, Madrid, Spain
2 Departamento de Geología, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
3 Instituto Geológico y Minero de España, Ríos Rosas, 23, 28003 Madrid, Spain

* E-mail address of corresponding author: mromero{at}geo.ucm.es

Palygorskite fibers growing along fault planes in the outcrops of a large fault zone in SE Spain (Carboneras Fault Zone: CFZ; Serrata de Níjar) 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: Si7.95Al0.05O20(Al1.93Fe0.08Mg1.92) (OH)2(OH2)4Na0.09K0.01Ca0.034(H2O). The samples have minor tetrahedral substitutions, with Mg/Al ratios close to one, and contain very small amounts of Fe3+. 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 Níjar and surrounding areas, we suggest that palygorskite may have formed during ongoing deformation in the CFZ, as a precipitate from Mg-rich hydrothermal fluids.

Key Words: Fault Gouge • Fault Zone • Macroscopic Palygorskite • Serrata de Nijar • Smectite • Spain




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E. Garcia-Romero, M. Suarez, J. Santaren, and A. Alvarez
CRYSTALLOCHEMICAL CHARACTERIZATION OF THE PALYGORSKITE AND SEPIOLITE FROM THE ALLOU KAGNE DEPOSIT, SENEGAL
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