Abstract
The geochemistry of the < 2 µm fractions of the Mio-Pliocene sediments and the bulk sample of the surrounding metamorphic rocks was studied in arder to characterize the geochemical environment during the sedimentation and to trace the influence of the surrounding rocks on the sediments. After making the relationships among the chemical elements and the minerals or the rocks by Principal Component Analysis (PCA), it has been carried out a Hierarchical Ascending Classification (HAC) which regroups the samples with similar geochemical characteristics into 8 classes. Graphical comparison of mean geochemical composition among HAC groups provides a better identification of inherited similarities between sorne sediments and the metapellitic rocks in the eastern Betic Cordilleras. Gneises, carbonated and metabasic rocks influence is inexistent or very located. Finally B and MgO contents have allowed us to distinguish different types of deposit environments with a higher or lower degree of confinement and with influence of sea-ar continental waters.
Highlights
The geochemistry of the
Dado que la asociación de muestras obtenidos de la clasificación jerárquica ascendente (CJA) no interrelaciona sedimentos y rocas madre a fin de poder encontrar este parentesco, se ha procedido a comparar los contenidos medios de los elementos químicos de las ocho clases de la CJA
Esta última serie de Zorreras presenta contenidos de boro muy bajos, que reflejan una sedimentación en un medio continental influenciado por agua dulce, tal y como atestigua la presencia de niveles de paleosuelos calcáreos
Summary
La cuenca de Sorbas se sitúa en la conjunción de dos dominios tectónicos diferentes delimitados por varios sistemas de fallas de desgarre. Es la terminación del Corredor de las Alpujarras, a este sistema pertenecen las fallas de dirección aproximada E-W (fallas de Gafarillos, Lucainena y El Marchante) que constituyen un pasillo transcurrente de componente dextroso.
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