Geomorphic and Lithologic Controls of Diffuse-Source Salinity, Grand Valley, Western Colorado

摘要

Grand Valley Mancos shale, composed of a thick sequence of interbedded shale and sandstone, is a significant contributor of dissolved solids to the upper Colorado River. Research was carried out to describe the area geomorphology and soluble mineral content relationships of surficial materials in erosionally-unstable landforms, to relate geomorphic stability to salt release processes from the area, and to recommend land use and/or salt control measures for reducing salt load to the River. Three landforms exist in the area studied: pediments, alluvial valley floors, and badlands, with the latter having the greatest surface area. The badlands are the least stable landform, releasing more sediment and salt into runoff than the other landforms.