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Gravity and Magnetic Surveys Over the Santa Rita Fault System, Southeastern Arizona

Open-File Report 2001-503

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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.

Additional Publication Details

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
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