Open-File Report 2012–1117
AbstractIt is important to understand whether major mining districts in north-central Nevada are underlain by Archean crust, known to contain major orogenic gold deposits, or, alternatively, by accreted crust of the Paleoproterozoic Mojave province. Determining the location and orientation of the Archean-Proterozoic suture zone between the Archean crust and Mojave province is also critical because it may influence subsequent patterns of sedimentation, deformation, magmatism, and hydrothermal activity. In the Great Basin, the attitude of the suture zone is unknown because it is concealed below cover. A regional magnetotelluric sounding profile along the Utah-Nevada State line reveals a deeply penetrating, broad electrical conductor that may be the Archean-Proterozoic suture zone in the northwest corner of Utah. This major crustal conductor’s strike direction is northwest, where it broadens to about 80 km wide below about 3-km depth. These results suggest that the southwestern limit of intact Archean crust in this part of the Great Basin is farther north than previously reported. These results also suggest that the major gold belts in north-central Nevada are located over the Paleoproterozoic Mojave province, and the Archean terrain lies northeast in the northwest corner of Utah. Rifted Archean crust segments south and west of the suture suggest that future mineral exploration northeast of current mineral trends may yield additional gold deposits. |
First posted June 27, 2012 For additional information contact: Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
Rodriguez, B.D., and Sampson, J.A., 2012, Constraining the location of the Archean–Proterozoic suture in the Great Basin based on magnetotelluric soundings: U.S. Geological Survey Open-File Report 2012–1117, 30 p.
Abstract
Introduction
Electrical Rock Properties
Magnetotelluric Method
Magnetotelluric Survey
Resistivity Modelling
Geologic Correlations
Results
Discussion
Summary and Conclusions
References Cited
Appendix 1. Magnetotelluric Data