RT Journal Article
T1 Nuevas aportaciones al estudio del «siderolítico» (Fm. Areniscas de Salamanca). Borde Oeste de la cuenca del Duero (Zamora)
T1 New contributions to the study of the «siderolitico» (Areniscas de Salamanca Fm.). Western border of the Duerobasin (Zamora)
A1 Molina Ballesteros, Eloy
A1 Alonso Gavilán, G.
A1 García Talegón, Jacinta
AB The Areniscas de Salamanca Formation, located in the western border of the Duero basin, has beenstudied by means of the polarized light microscope and the SEM. The study has brought out some interestingremarks: 1) important processes of redistribution of matter within the sediments displaying manybioturbation features (collapses, tubules, cutans, etc) all of them being previous to lithification; 2) presenceof spicules of sponges (megascleras) appearing in the intermediate member of this Formation; 3) progressiveenrichment in silica upwards with an increase in the contrasts of hues of the sediment due to Fe oxyhydroxidessegregations.Although the dominant forms of silica are lepispheres, cavities filled up by idiomorphic crystals of tridimite,fibrous forms, microquartzs and isotropic opal are frequents. The presence of sponge spicules, both isolatedor grouped, open the possibility (¿?) that this Formation had been related in some way to a seashoresedimentary environment in someone period of its geological history
YR 2007
FD 2007
LK http://hdl.handle.net/10272/8424
UL http://hdl.handle.net/10272/8424
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026