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Fault-Hosted Palygorskite from the Serrata de Nijar deformation zone (SE Spain)

García Romero, Emilia and Súarez Barrios, Mercedes and Oyarzun Muñoz, Roberto and López García, José Ángel and Regueiro, M. (2006) Fault-Hosted Palygorskite from the Serrata de Nijar deformation zone (SE Spain). Clays and clay minerals, 54 (3). pp. 324-332. ISSN 0009-8604

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Abstract

Palygorskite fibers growing along fault planes in the outcrops of a large fault zone in SE Spain
(Carboneras Fault Zone: CFZ; Serrata de NõÂjar) 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 NõÂjar and surrounding areas, we
suggest that palygorskite may have formed during ongoing deformation in the CFZ, as a precipitate from
Mg-rich hydrothermal fluids.


Item Type:Article
Uncontrolled Keywords:Fault Gouge, Fault Zone, Macroscopic Palygorskite, Serrata de Nijar, Smectite, Spain
Subjects:Sciences > Geology > Mineralogy
ID Code:13407
Deposited On:14 Oct 2011 11:10
Last Modified:21 Oct 2011 11:46

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