Airborne magnetic and radiometric survey, central Arkansas and southern Missouri, 2023

This publication provides digital flight line data for a high-resolution magnetic and radiometric survey over part of central Arkansas and southern Missouri. The airborne geophysical survey was funded by the Earth Mapping Resources Initiative and was designed to meet the complimentary needs related to geologic mapping and mineral resource research.  The survey covers an irregularly shaped area of approximately 75,070 square kilometers (km2) from southern Missouri, across part of the Arkoma basin and Ouachita Mountains into central Arkansas and includes 282,029 line-km of magnetic and radiometric data. Data were collected from fixed-wing aircraft flown at a median terrain clearance of 115 meters (m) above topography along north-south flight lines spaced at 300-m intervals. Tie lines were flown in an east-west direction every 3,000 m. Data were collected by EON Geosciences Inc. under contract with the USGS using five fixed-wing aircraft with a magnetometer mounted in the tail stinger and a fully calibrated gamma-ray spectrometer. The survey operated out of the Branson Airport in Missouri, the West Memphis Municipal Airport in Tennessee, and the North Little Rock Municipal and Texarkana Regional Airports in Arkansas from November of 2022 to May of 2023. Files that are available in this publication include flight line data for the magnetic survey, flight line data for the radiometric survey and a report describing the survey parameters, field operations, quality control and data reduction procedures. A zip file is provided that contains the contractor's deliverable products that includes Geosoft databases and grids for this magnetic and radiometric survey and the report describing the survey and data reduction. These products can be accessed using the free software Geosoft Viewer or the commercial Oasis montaj software.