RT Journal Article
T1 Alteración diferencial de las rocas volcánicas ácidas en el sector de Riotinto, Faja Pirítica Ibérica
T1 Differential alteration of acid volcanic rocks in the Riotinto area, Iberian Pyrite Belt, Spain
A1 Donaire Romero, Teodosio
A1 Toscano Macías, Manuel
A1 Valenzuela Aznar, Alfonso
A1 González Roldán, Manuel Jesús
A1 Pascual Martínez, Emilio
AB Regional hydrothermal alteration of rhyolitic rocks from the Odiel area, Iberian Pyrite belt, Spain, has been assessed through geochemical study. Disregarding volcanic facies, all rhyolites have similar immobile trace element contents. However, they show a contrasting hydrothermal alteration on currently used alteration plots: volcaniclastic rocks mainly plot as albitized rocks, whereas coherent rocks plot as weakly altered rocks. Also, a sharp contrast is shown between regional and focused, VHMS-related alteration trends. Differences in the degree of regional alteration between volcaniclastic and coherent rocks are to be related to contrasting permeability, resulting in different water-rock ratios during hydrothermal processes.Accordingly, coherent rocks are to be preferred as least-altered samples for mass balance and other geochemical purposes
YR 2010
FD 2010
LK http://hdl.handle.net/10272/7828
UL http://hdl.handle.net/10272/7828
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026