Seasonal Evaporite Sedimentation in Desert Playa Lakes of the Karinga Creek Drainage System, Central Australia
Published:January 01, 1994
Aro V. Arakel, Tian Hongjun, 1994. "Seasonal Evaporite Sedimentation in Desert Playa Lakes of the Karinga Creek Drainage System, Central Australia", Sedimentology and Geochemistry of Modern and Ancient Saline Lakes Models, Robin W. Renaut, William M. Last
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The linear chain of playa lakes in the Karinga Creek drainage system, central Australia, hosts seasonal efflorescent crusts characterized by laterally intergrading halite and mirabilite facies. The sedimentary features of these evaporite facies and chemical compositions of the playa brines collectively reflect aperiodic thermodynamic equilibrium, with respect to sulfate and chloride minerals, due to repeated evaporation and cooling induced by desert climatic conditions. The coexistence of halite and mirabilite facies in the efflorescent crusts is largely a consequence of the groundwater discharge pattern and the hydrochemical setting of brine pools at a given point, rather than a true representation of concurrent episodes of chemical sedimentation.
These findings agree with results from isothermal evaporation experiments and reflect a pattern of playa sedimentation that differs significantly from that of simple evaporation. An assessment of the thermodynamic requirements for variations in the patterns of chemical sedimentation of ancient shallowing-upward lacustrine sequences may provide valuable paleoenvironmental information.
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Sedimentology and Geochemistry of Modern and Ancient Saline Lakes Models
Sedimentology and Geochemistry of Modern and Ancient Saline Lakes - This volume of papers grew out of a four-day symposium entitled ?Sedimentary and Paleolimnological Records of Saline Lakes? held at Saskatoon, Canada in August, 1991. The aim of this Special Publication is to bring together selected papers from this conference that deal specifically with the sedimentological, inorganic geochemical, and hydrological aspects of salt lakes and their stratigraphic records. This volume is divided into four sections. The first section contains papers that deal with modern saline lakes. The second section contains papers dealing with sedimentation and diagenesis of late Quaternary salt lakes. The third and fourth sections contain papers devoted to ancient (pre-Quaternary) Lacustrine sequences.