Las asociaciones de microfauna como indicadores de cambios paleoambientales en los ciclos fluvio-lacustres Miocenos (NE de la Cuenca del Duero, España)

A. Herrero-Hernández; G. Alonso-Gavilán; J. Civis Llovera

doi:10.3989/egeol.42381.400

Authors

A. Herrero-Hernández Grupo de Investigación Ingeniería Geológica y de Materiales (INGEOMAT), E.S.T.I. de Minas, Universidad de León
G. Alonso-Gavilán Departamento de Geología, Universidad de Salamanca
J. Civis Llovera Instituto Geológico y Minero de España (IGME)

DOI:

https://doi.org/10.3989/egeol.42381.400

Keywords:

fluvial system, lacustrine, ostracods, paleoecology, Upper Miocene, Duero Basin

Abstract

The siliclastic and carbonate deposits are interbedded in the Villadiego area (Miocene, NE Duero Basin). They have been subdivided into two high-rank depositional sequences: DDS and CDS. The sedimentary analysis of these units and the study of the microfauna content, mainly ostracods, led to the identification of lacustrine-fluvial interaction systems. The sedimentary characteristics reveal the existence of fluvial systems of gravel, flood plains and lacustrine systems that were interconnected and intimately related in north-south direction. In the sedimentological analysis, thirteen types of fluvial and lacustrine lithofacies and six genetic facies associations were recognized. The top of DDS is the result of lake level risings. The CDS shows a deepening-shallowing cycle. The ostracod micropaleontological analysis of the sediments have been studied, with the aim of reconstructing the palaeoenvironmental evolution of this area. These microfauna assemblages integrated with the analysis of the sedimentary facies allowed to conclude the existence of lakes with a water-bearing level of few tens of meters. A change in the chemical conditions of the waters, which evolved from oligohaline and carbonated to mesohaline and sulphated is concluded.

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