A magnetic investigation of the Round Mountain plug, Castle Valley, Grand County, Utah
Trace Elements Investigations
342
This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission
By: R.A. Black
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Abstract
A magnetic survey was made in Castle Valley, Grand County, Utah, to determine if the Round Mountain plug was fed laterally from the La Sal Mountains or vertically from a source at depth. Additional measurements were made around the exposure of igneous rock to obtain the shape of the plug at depth. No indication of a buried lateral igneous feeder was detected on the magnetic profileso The magnetic contour map showed that the plug was much larger than indicated by the diorite porphyry outcrop, and that the buried part of the plug southeast of Round Mountain has a higher magnetic susceptibility than the diorite outcrop. Theoretical anomalies, calculated using the susceptibility of the diorite outcrop, indicate that a lateral feeder at a depth of greater than 200 feet could not be detected. The size and shape of the magnetic anomaly as shown on the contour map suggest that the plug was fed from a source at depth.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A magnetic investigation of the Round Mountain plug, Castle Valley, Grand County, Utah |
| Series title | Trace Elements Investigations |
| Series number | 342 |
| DOI | 10.3133/tei342 |
| Year Published | 1953 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 25 p. |
| Country | United States |
| State | Utah |
| County | Grand County |
| Other Geospatial | Round Mountain |
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