Accession Number : ADA112201

Title :   MX Siting Investigation, Gravity Survey - Dugway Valley, Utah.

Descriptive Note : Final rept.

Corporate Author : ERTEC WESTERN INC LONG BEACH CA

PDF Url : ADA112201

Report Date : 28 Aug 1981

Pagination or Media Count : 75

Abstract : The interpretation of the gravity survey in Dugway Valley indicates two distinct basins separated by a small, shallow, buried ridge. The northern basin is an asymmetrical tilt block which is approximately 1800 feet (549 m) deep. The block is bounded on the west by a major north-south normal fault system near the base of the Dugway Range. The southern basin is interpreted to partly comprise a collapsed, highly fractured, Tertiary caldera complex. The gravity indicates the caldera volcanics are accumulated to a thickness of about 3500 feet (1067 m) thick in a northwesterly trending trough. This caldera complex is transected by later Basin and Range, north-south trending faults systems. A narrow bedrock ridge or horst extends south from the Keg Mountains at a depth of about 2000 feet (610 m). This ridge could restrict groundwater movement between southern Dugway Valley and Sevier Desert Valley. An average density contrast of -0.40 g/cu cm between the alluvium-volcanic fill material and the Paleozoic carbonate bedrock was used to calculate the Valley depth.

Descriptors :   *Valleys, *Gravity, Utah, Surveys, Gravimetry, Mapping, Contours, Geology

Subject Categories : Geodesy
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE