RT Journal Article
T1 Fault-Hosted Palygorskite from the Serrata de Nijar deformation zone (SE Spain)
A1 García Romero, Emilia
A1 Súarez Barrios, Mercedes
A1 Oyarzun Muñoz, Roberto
A1 López García, José Ángel
A1 Regueiro, M.
AB 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 electronmicroscopy-energy dispersive X-ray analysis, and transmission electron microscopy-analytical electronmicroscopy. 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/Alratios 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 theexistence of widespread hydrothermal processes along the Serrata de NõÂjar and surrounding areas, wesuggest that palygorskite may have formed during ongoing deformation in the CFZ, as a precipitate fromMg-rich hydrothermal fluids.
PB Clay Minerals Society
SN 0009-8604
YR 2006
FD 2006
LK https://hdl.handle.net/20.500.14352/49742
UL https://hdl.handle.net/20.500.14352/49742
LA eng
DS Docta Complutense
RD 11 abr 2025