Accession Number:

ADA112201

Title:

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

Descriptive Note:

Final rept.

Corporate Author:

ERTEC WESTERN INC LONG BEACH CA

Personal Author(s):

Report Date:

1981-08-28

Pagination or Media Count:

75.0

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 gcu cm between the alluvium-volcanic fill material and the Paleozoic carbonate bedrock was used to calculate the Valley depth.

Subject Categories:

  • Geodesy
  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE