Airborne magnetic and radiometric survey, South Pass-Granite Mountains region, Wyoming, 2023

This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over the South Pass-Granite Mountains region in central Wyoming. The airborne survey was funded by the state of Wyoming, designed by the Wyoming State Geological Survey (WSGS), and contracted by the USGS. The survey is aligned with the Earth Mapping Resources Initiative and was designed to meet complementary needs related to geologic mapping and characterization of mineral resource potential. A total of 47,973.8 line km of magnetic and radiometric data were acquired over an area of 8639 km. Data were collected from a helicopter flown at a nominal terrain clearance of 100 meters (m) above topography along N-S flight lines spaced at 200 m intervals. Tie lines were flown in an E-W direction every 2000 m. Data were collected by New Sense Geophysics Ltd. and Merrick-Surdex Joint Venture under contract to the USGS using a helicopter with a magnetometer mounted in a stinger and a fully calibrated gamma-ray spectrometer. The survey operated out of airports in Rawlins and Lander, Wyoming, from July of 2023 to September 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 the magnetic and radiometric survey and the report describing the survey and data reduction.

本数据集发布提供了怀俄明州中部South Pass-Granite Mountains区域的高分辨率航空磁测与航空放射性测量飞行线数据。本次航空测量由怀俄明州资助，怀俄明州地质调查局（Wyoming State Geological Survey, WSGS）设计，美国地质调查局（USGS）外包实施。该调查契合地球测绘资源倡议（Earth Mapping Resources Initiative），旨在满足地质填图与矿产资源潜力评价的互补需求。本次调查共获取总长47973.8千米的磁测与放射性测量数据，覆盖面积8639平方千米。数据采集采用直升机沿南北向飞行线开展，标称地形离地高度为100米，飞行线间距为200米；每2000米布设一条东西向联络测线。数据由New Sense Geophysics Ltd.与Merrick-Surdex联营体受USGS委托采集，所用直升机搭载了杆式磁强计与经过全校准的伽马能谱仪。本次作业以怀俄明州Rawlins与Lander机场为基地，作业时段为2023年7月至2023年9月。本发布提供的可用文件包括磁测飞行线数据、放射性测量飞行线数据，以及一份详述调查参数、野外作业、质量控制与数据归算流程的报告。此外还提供一个压缩包，内含承包商提交的成果产品，包括磁测与放射性测量的Geosoft数据库、格网数据，以及详述调查与数据处理流程的报告。