Airborne electromagnetic data and processing within Leach Lake Basin, Fort Irwin, California

First posted January 6, 2014 For additional information, contact: Contact Information,Geology, Minerals, Energy, & Geophysics Science Center—Menlo ParkU.S. Geological Survey345 Middlefield RoadMenlo Park, CA 94025-3591 From December 2010 to January 2011, the U.S. Geological Survey conducted airborne electromagnetic and magnetic surveys of Leach Lake Basin within the National Training Center, Fort Irwin, California. These data were collected to characterize the subsurface and provide information needed to understand and manage groundwater resources within Fort Irwin. A resistivity stratigraphy was developed using ground-based time-domain electromagnetic soundings together with laboratory resistivity measurements on hand samples and borehole geophysical logs from nearby basins. This report releases data associated with the airborne surveys, as well as resistivity cross-sections and depth slices derived from inversion of the airborne electromagnetic data. The resulting resistivity models confirm and add to the geologic framework, constrain the hydrostratigraphy and the depth to basement, and reveal the distribution of faults and folds within the basin.