Gravity and Magnetic Surveys Over the Santa Rita Fault System, Southeastern Arizona
Open-File Report
2001-503
By: Mary Hegmann
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Abstract
Gravity and magnetic surveys were performed in the northeast portion of the Santa Rita Experimental Range, in southeastern Arizona, to identify faults and gain a better understanding of the subsurface geology. A total of 234 gravity stations were established, and numerous magnetic data were collected with portable and truck-mounted
proton precession magnetometers. In addition, one line of very low frequency electromagnetic data was collected together with magnetic data.
Gravity anomalies are used to identify two normal faults that project northward toward a previously identified fault. The gravity data also confirm the location of a second previously interpreted normal fault. Interpretation of magnetic anomaly data indicates the presence of a higher-susceptibility sedimentary unit located beneath lowersusceptibility surficial sediments. Magnetic anomaly data identify a 1-km-wide negative anomaly east of these faults caused by an unknown source and reveal the high variability of susceptibility in the Tertiary intrusive rocks in the area.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Gravity and Magnetic Surveys Over the Santa Rita Fault System, Southeastern Arizona |
| Series title | Open-File Report |
| Series number | 2001-503 |
| DOI | 10.3133/ofr2001503 |
| Edition | - |
| Year Published | 2001 |
| Language | ENGLISH |
| Publisher | Geological Survey (U.S.) |
| Contributing office(s) | Western Mineral Resources |
| Description | Report: 108 p.; GIS Files |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |
| Google Analytic Metrics | Metrics page |