Geophysical Unit of Menlo Park, Calif.

In Cooperation with the Southern Nevada Water Authority (SNWA)

U.S. Geological Survey
Open-File Report 2008-1299
Version 1.0

Gravity Data from Dry Lake and Delamar Valleys, east-central Nevada

By Edward A. Mankinen, Bruce A. Chuchel, and Barry C. Moring


map showing that the study area extends from White River Valley in the northwest to the Delamar Mountains south of Caliente in the southeast
Shaded-relief map of the study area, east-central Nevada. Topographic contour interval is 200 m (from figure 1)

Cenozoic basins in eastern Nevada and western Utah constitute major ground-water recharge areas in the eastern part of the Great Basin, and our continuing studies are intended to characterize the geologic framework of the region. Prior to these investigations, regional gravity coverage was variable over the region, adequate in some areas and very sparse in others. The current study in Nevada provides additional high-resolution gravity along transects in Dry Lake and Delamar Valleys to supplement data we established previously in Cave and Muleshoe Valleys. We combine all previously available gravity data and calculate an up-to-date isostatic residual gravity map of the study area. Major density contrasts are identified, indicating zones where Cenozoic tectonic activity could have been accommodated. A gravity inversion method is used to calculate depths to pre-Cenozoic basement rock and to estimate maximum alluvial/volcanic fill in the valleys. Average depths of basin fill in the deeper parts of Cave, Muleshoe, Dry Lake, and Delamar Valleys are approximately 4 km, 2 km, 5 km, and 3 km, respectively.

Download this report as a 30-page PDF file (of2008-1299.pdf; 5.2 MB)
Download shapefile (16 kB zip file)
Metadata (text file)

For questions about the content of this report, contact Ed Mankinen

Suggested citation and version history

Download a free copy of the latest version of Adobe Reader.

| Help | PDF help | Publications main page |
| Western Open-File Reports for 2008 |
| Geologic Division | Geophysical Unit of Menlo Park, Calif. (GUMP) |

This report is available only on the Web

Accessibility FOIA Privacy Policies and Notices

Take Pride in America home page. logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Michael Diggles
Page Created: September 29, 2008
Page Last Modified: January 28, 2009 (jmw)