Laboratory Electrical Resistivity Analysis of Geologic Samples from Fort Irwin, California
Links
- Document: Report (15.7 MB pdf)
- Larger Work: This publication is Chapter E of Geology and geophysics applied to groundwater hydrology at Fort Irwin, California
- Companion File: Supplemental Data (362 kB pdf)
- Read Me: Supplemental Data README (78 kB pdf)
- Download citation as: RIS | Dublin Core
Abstract
Correlating laboratory resistivity measurements with geophysical resistivity models helps constrain these models to the geology and lithology of an area. Throughout the Fort Irwin National Training Center area, 111 samples from both cored boreholes and surface outcrops were collected and processed for laboratory measurements. These samples represent various lithologic types that include plutonic and metamorphic (basement) rocks, lava flows, consolidated sedimentary rocks, and unconsolidated sedimentary deposits that formed in a series of intermountain basins. Basement rocks, lava flows, and some lithified tuffs are generally resistive (≥100 ohm-meters [Ω·m]) when saturated. Saturated unconsolidated samples are moderately conductive to conductive, with resistivities generally less than 100 Ω·m, and many of these samples are less than 50 Ω·m. The unconsolidated samples can further be separated into two broad groups: (1) younger sediments that are moderately conductive, owing to their limited clay content, and (2) older, more conductive sediments with a higher clay content that reflects substantial amounts of originally glassy volcanic ash subsequently altered to clay. The older sediments are believed to be Tertiary. Time-domain electromagnetic (TEM) data were acquired near most of the boreholes, and, on the whole, close agreements between laboratory measurements and resistivity models were found.
Suggested Citation
Bloss, B.R., and Bedrosian, P.A, 2015, Laboratory electrical resistivity analysis of geologic samples from Fort Irwin, California, chap. E of Buesch, D.C., ed., Geology and geophysics applied to groundwater hydrology at Fort Irwin, California: U.S. Geological Survey Open-file Report 2013-1024, 104 p., https://doi.org/10.3133/ofr20131024E.
ISSN: 2331-1258 (online)
Study Area
Publication type | Report |
---|---|
Publication Subtype | USGS Numbered Series |
Title | Laboratory electrical resistivity analysis of geologic samples from Fort Irwin, California |
Series title | Open-File Report |
Series number | 2013-1024 |
Chapter | E |
DOI | 10.3133/ofr20131024E |
Year Published | 2015 |
Language | English |
Publisher | U.S. Geological Survey |
Publisher location | Reston, VA |
Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
Description | Report: vii, 104 p.; Supplemental Data ReadMe; Supplemental Data ZIP |
Larger Work Type | Report |
Larger Work Subtype | USGS Numbered Series |
Larger Work Title | Geology and geophysics applied to groundwater hydrology at Fort Irwin, California |
Country | United States |
State | California |
County | San Bernardino County |
City | Fort Irwin |
Online Only (Y/N) | Y |
Additional Online Files (Y/N) | Y |
Google Analytic Metrics | Metrics page |