Upper-Pleistocene terrace deposits in Mediterranean climate: geomorphological and source-rock control on mineral and geochemical signatures (Betic Cordillera, SE Spain)
| Contribuinte(s) |
Junta de Andalucía Research Group RNM-325 University of Jaén project “Complex rheologic behaviour of active fault zones in carbonate multilayer sequences: applications to the estimation of seismic hazard and the exploitation of water” |
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| Data(s) |
20/10/2016
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| Resumo |
Mineral and chemical composition of alluvial Upper-Pleistocene deposits from the Alto Guadalquivir Basin (SE Spain) were studied as a tool to identify sedimentary and geomorphological processes controlling its formation. Sediments located upstream, in the north-eastern sector of the basin, are rich in dolomite, illite, MgO and KB2BO. Downstream, sediments at the sequence base are enriched in calcite, smectite and CaO, whereas the upper sediments have similar features to those from upstream. Elevated rare-earth elements (REE) values can be related to low carbonate content in the sediments and the increase of silicate material produced and concentrated during soil formation processes in the neighbouring source areas. Two mineralogical and geochemical signatures related to different sediment source areas were identified. Basal levels were deposited during a predominantly erosive initial stage, and are mainly composed of calcite and smectite materials enriched in REE coming from Neogene marls and limestones. Then the deposition of the upper levels of the alluvial sequences, made of dolomite and illitic materials depleted in REE coming from the surrounding Sierra de Cazorla area took place during a less erosive later stage of the fluvial system. Such modification was responsible of the change in the mineralogical and geochemical composition of the alluvial sediments. Se ha estudiado la composición mineral y química de los depósitos aluviales del Pleistoceno Superior del Alto Guadalquivir (SE de España) como una herramienta para identificar los procesos sedimentarios y geomorfológicos que controlan su formación. Los sedimentos de la parte alta del cauce, en el sector noreste de la cuenca, son ricos en dolomita, illita, MgO y K2O. Descendiendo en el cauce, los sedimentos de la base de la secuencia están enriquecidos en calcita, esmectita y CaO, mientras que los sedimentos de la parte superior de dicha secuencia tienen características similares a los presentes en la parte superior del cauce. La presencia de sedimentos con elevados valores en elementos de las tierras raras (REE) puede relacionarse con el bajo contenido en carbonatos y el incremento de silicatos producido y concentrado durante los procesos de formación de suelos en las áreas fuente vecinas.Se identificaron dos patrones mineralógicos y geoquímicos relacionados con los diferentes sedimentos de las áreas fuente. Los niveles basales fueron depositados durante una etapa inicial predominantemente erosiva y están formados principalmente por materiales calcíticos y esmectíticos enriquecidos en REE que proceden de las margas y calizas del Neógeno. Posteriormente, el depósito de los materiales de los niveles superiores de las secuencias aluviales, formados por materiales que proceden del área de la Sierra de Cazorla ricos en dolomita e illita y empobrecidos en REE, tuvo lugar durante una etapa posterior menos erosiva del sistema fluvial. Las modificaciones de las condiciones del sistema fluvial fueron responsables del cambio en la composición geoquímica y mineralógica de los sedimentos aluviales. |
| Formato |
application/pdf |
| Identificador |
http://revistas.ucm.es/index.php/JIGE/article/view/52865 10.5209/rev_JIGE.2016.v42.n2.52865 |
| Publicador |
Ediciones Complutense |
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| Fonte |
Journal of Iberian Geology; Vol 42, No 2 (2016); 187-200 Journal of Iberian Geology; Vol 42, No 2 (2016); 187-200 |
| Palavras-Chave | #Geology, Mineralogy, Geomorphology #fluvial system; calcite/dolomite ratio; clay minerals; REE patterns; Guadalquivir River; source area #sistema fluvial; razón calcita/dolomita; arcillas; tierras raras; río Guadalquivir; área fuente |
| Tipo |
info:eu-repo/semantics/article Artículo revisado por pares info:eu-repo/semantics/publishedVersion |
