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Quaternary palaeohydrological evolution of a playa lake: Salada Mediana, central Ebro Basin, Spain
Author(s) -
ValeroGarcÉs Blas L.,
DelgadoHuertas Antonio,
Navas Ana,
MachÍn Javier,
GonzÁlezSampÉriz PenÉlope,
Kelts Kerry
Publication year - 2000
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1046/j.1365-3091.2000.00346.x
Subject(s) - geology , sedimentary depositional environment , dolomite , sedimentary rock , paleontology , aeolian processes , geochemistry , quaternary , holocene , structural basin
Sedimentary features, mineralogy, bulk geochemical composition, stable isotope analyses and pollen data from sediment cores were used to reconstruct the Late Quaternary depositional evolution of the Salada Mediana playa lake (central Ebro Basin, northeastern Spain). The 150‐cm‐long sediment core sequence is composed of gypsum‐ and dolomite‐rich muds (Lower and Middle sections) and black, laminated, calcite‐bearing sediments (Upper section). The Salada Mediana formed as a karstic depression in the Miocene gypsum substratum during the Late Pleistocene. The Lower section was deposited in a sulphate–carbonate saline lake that ended with a period of desiccation and basin floor deflation. Subsequent deposition (Middle section) took place in a playa‐lake system. Two cycles of lower water table and expanded saline mud flats occurred. The Holocene sequence is missing, probably as a result of aeolian erosion. Sedimentation resumed only a few centuries ago, and saline pan environments dominated until modern times. The Salada Mediana facies succession was mainly governed by fluctuations in the hydrological balance, brine composition, and salinity; however, aeolian processes (detrital input and deflation) and recycling of previously precipitated salts also played a significant role.