Geology, mineralogy, and hydrology of U.S. playas
Terrestrial Sciences Laboratory, Air Force Cambridge Research Laboratories, 1965 - Science - 176 pages
Playas (dry lake beds), the flat central portions of desert basins, are landforms which have unique properties. Most of those in the U.S. were sites of larger Pleistocene lakes, and are characterized by fine-grained lacustrine silt and clay, with secondary saline, sulfate, and carbonate minerals. The playa surfaces are essentially level, but hydrologic, tectonic, and climatic forces are continually modifying them. A variety of surface features representing a range of influence of the arid environment have been noted; these features are subject to change in response to a changing environment. Playa basins have been studied in the field using the geophysical methods of gravity, seismology, electrical resistivity, and magnetism. This report is a collection of six individual papers discussing the environment and surface features, mineralogy, hydrology, structure, geophysics, and airphoto features of playas. (Author).
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ENVIRONMENTAL SETTING AND GENERAL SURFACE
MINERALOGICAL FEATURES OF MOJAVE DESERT PLAYA
HYDROLOGIC TYPES OF PLAYAS AND CLOSED VALLEYS
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50 percent Clay alkali stain amount anomalies argillic playas Basin and Range Basin-Range Bouguer anomaly California carbonate Cenozoic characteristics chlorite classification clay minerals clay playas clay-size closed valleys colloidal colloidal particles compact crust crustal samples crustal types Death Valley deposition depth discharge occurs dry playas dry-surfaced erosion evaporation Figure fine-grained fissures flooding ratio Garlock Fault Geological geophysical giant contraction polygons ground water ground-water discharge ground-water-discharging playas hydrologic illite indicate kaolinite Knoop Value Lavic Leach Mabey material Mexico mineralogy Mojave Desert montmorillonite Nevada Nonstructural Water observed Panamint particle-size distribution permeability phreatophyte mounds phreatophytes piezometric piezometric surface playa crusts Playa Lakes playa sediments playa surface Playa Type Based Pleistocene Pleistocene lake polygons Province refiltration region relatively Rogers Rosamond saline saline content Salt Pavements San Andreas Fault Searles seismic shallow silt structure tectonic tion topographic U.S. Geol underlain water table water-table Wet Playas Willcox Playa zone