A geophysical study of the Patagonia-Sonoita Nature Conservancy property was
carried out to determine the depth to bedrock and the geometry of the underlying basin in
the area. The survey was part of the ongoing U.S. Geological Survey studies of the
region. CSAMT, TEM, DC Resistivity, Seismic, Gravity, and Magnetic surveys were
performed. Many of the surveys were not able to map depth to bedrock because the
depth of penetration of these surveys was less than the large depth to bedrock, which we
encountered in this area. The best estimate of depth to bedrock in the center of the valley
is of the order of one kilometer, as identified by the CSAMT surveys. The CSAMT
survey found a significant low-resistivity anomaly in the vicinity of the Nature
Conservancy Visitor Center. This low-resistivity anomaly could be due to clay-rich
rocks or possibly mineralized rocks. Magnetic and TEM anomalies also occurred in the
same area as the CSAMT low-resistivity anomaly. Seismic surveys showed a loosely
consolidated surface layer above more consolidated alluvium. The model from the ·
Gravity survey shows an extensive alluvial basin overlying rhyolite with high and low-angle
faults.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/624616 |
| Date | 01 June 1999 |
| Creators | Cisneros, Gabriel, Dearman, Marnee M., Dodds, Brian E., Edwards, Nils K., El-Kaliouby, Hesham, Gajda, Charles E., Henley, Michael L., Killian, James R., Kyselka, Rebecca C., Moore, Jeffrey R., Mwape, Finnegan, Philbin, James J., Phiri, Aimee C., Reed, Bryan W., Sorgenfrei, Michael M., Sternberg, Ben K., Weston, Eric A. |
| Contributors | University of Arizona |
| Publisher | LASI Laboratory for Advanced Surface Imaging, The University of Arizona (Tucson, AZ) |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | Book |
| Rights | Copyright © Arizona Board of Regents |
| Relation | LASI-99-1, http://www.lasi.arizona.edu/ |
Page generated in 0.0023 seconds