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"name": "Laboratory electrical resistivity analysis of geologic samples from Fort Irwin, California",
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"value": "10.3133/ofr20131024E",
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"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 (\u2265100 ohm-meters [\u03a9\u00b7m]) when saturated. Saturated unconsolidated samples are moderately conductive to conductive, with resistivities generally less than 100 \u03a9\u00b7m, and many of these samples are less than 50 \u03a9\u00b7m. 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. ",
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