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The geochemistry of the < 2 &#194;&#181;m 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.  Se ha realizado un estudio geoqu&#237;mico de la fracci&#243;n arcillosa de los sedimentos miopliocenos y de la muestra total de rocas metam&#243;rficas de los relieves adyacentes con el fin de determinar las caracter&#237;sticas geoqu&#237;micas del medio de sedimentaci&#243;n y la influencia de las rocas circundantes sobre los sedimentos. Tras relacionar elementos qu&#237;micos con rocas y minerales mediante un (ACP), se ha realizado una clasificaci&#243;n jer&#225;rquica ascendente (CJA), que ha reagrupado las muestras con caracter&#237;sticas geoqu&#237;micas similares en 8 clases. La comparaci&#243;n gr&#225;fica de su composici&#243;n geoqu&#237;mica media pone de manifiesto una clara relaci&#243;n gen&#233;tica entre los sedimentos y las rocas metapel&#237;ticas de la Cordillera B&#233;tica oriental, siendo la influencia de gneises, rocas carbonatadas metam&#243;rficas y metabasitas muy localizada o inexistente. Finalmente, los contenidos de B y Mg nos han permitido distinguir varios tipos de medios de dep&#243;sito que presentan diferentes grados de confinamiento y que, en relaci&#243;n con los cambios del nivel del mar producidos durante la crisis messiniense, se han visto influenciados sucesivamente por aguas marinas y continentales

Implicaciones paleoambientales deducidas del estudio geoquímico del transito mioceno-plioceno en la Cuenca de Sorbas (Almería)