Paleoenvironmental evolution of the Early Pleistocene lacustrine sequence at Barranco León archeological site (Orce,Baza Basin,Southern Spain) from stable isotopes and Sr and Mg chemistry of ostracod shells |
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Authors: | P Anadón M Gabàs |
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Institution: | (1) Institut de Ciències de la Terra J. Almera CSIC, C. Lluís Solé Sabarís s.n., 08028 Barcelona, Spain;(2) Present address: PAYMA Cotas SA, C. Roselló nave 5, Pol Ind La Canya, 17800 Olot, Spain |
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Abstract: | Stable isotope and trace element contents of Cyprideis torosa valves from the Lower Pleistocene marginal lacustrine sequence of Barranco León, Baza Basin (Southern Spain), allow us to
reconstruct the geochemical record of environmental change in this marginal area of the basin and to compare these data with
the environmental changes inferred from the faunal associations. Hydrochemical features of the Baza Lake system have been
influenced by changes in water source, solute composition, and water level during the past. Three water types may have been
involved in a complex mixing in the marginal area during the studied intervals (1) waters of the Baza lacustrine system that
underwent large P/E changes, (2) dilute, meteoric water inputs (surface and shallow groundwaters), (3) saline groundwater
inputs of meteoric origin that acquired their salinity by halite and gypsum dissolution. Four stages in the Pleistocene paleoenvironmental
evolution of the Barranco León area have been differentiated: stage I records a high lake level (highstand) of the saline
closed-lake system. Stage II corresponds to very shallow, palustrine conditions. Stage III records the varying influence of
the three water types under changing water level in a closed-lake. Stage IV corresponds to a through-flowing, open lacustrine
environment mainly fed by meteoric saline groundwaters with minor inputs of stream waters. This small through-flowing lake
was connected to a larger, inner saline closed-lake system. The BL 5 mammal site with lithic tools of an early human occupation
phase in Western Europe corresponds to a particular episode within this stage of the environmental evolution in the marginal
zone of the Baza Lake.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Lacustrine deposits Stable isotopes Trace-element geochemistry Ostracods Pleistocene Southern Spain |
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