Airborne magnetic and radiometric survey, Virginia and North Carolina Fall Zone, 2021

Dates

Publication Date: 2022-11-08
Start Date: 2021-01-23
End Date: 2021-08-31

Citation

Shah, A.K. and Connell, D.M., 2022, Airborne magnetic and radiometric survey, Virginia and North Carolina Fall Zone, 2021: U.S. Geological Survey data release, https://doi.org/10.5066/P9RQCG2I.

Summary

This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over Virginia and North Carolina along and near the eastern U.S. 'Fall Zone', which represents the transitional area between Atlantic Coastal Plain sediments and Piedmont metamorphic and igneous rocks. The airborne data collection was funded by the U.S. Geological Survey (USGS) Earth Mapping Resources Initiative (Earth MRI) and National Cooperative Geological Mapping Program (NCGMP). Goals include a gaining a better understanding of placer deposits containing critical mineral resources titanium, zirconium, and rare earth elements, assisting geologic mapping of the crystalline basement either exposed at the surface or buried [...]

Summary

This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over Virginia and North Carolina along and near the eastern U.S. 'Fall Zone', which represents the transitional area between Atlantic Coastal Plain sediments and Piedmont metamorphic and igneous rocks. The airborne data collection was funded by the U.S. Geological Survey (USGS) Earth Mapping Resources Initiative (Earth MRI) and National Cooperative Geological Mapping Program (NCGMP). Goals include a gaining a better understanding of placer deposits containing critical mineral resources titanium, zirconium, and rare earth elements, assisting geologic mapping of the crystalline basement either exposed at the surface or buried beneath Atlantic Coastal Plain sediments, and imaging structures associated with the central Virginia seismic zone. The northwestern corner of the survey overlaps an airborne magnetic, radiometric, and gravity survey collected in 2012 over the 2011 Mw5.8 Mineral Virginia earthquake epicenter (Shah, 2014). The southern boundary of the survey is near the town of Rocky Mount, North Carolina.

Data for this survey were collected and processed by Eon Geosciences, Inc. via subcontract to Woolpert, Inc., who in turn were contracted by the USGS. Using a fixed wing aircraft with a magnetometer mounted in the tail stinger and a fully calibrated gamma ray spectrometer, data were collected along east-west flight lines spaced 275 meters (m) apart with north-south tie lines flown every 2500 m. A mean terrain clearance of 138 m was maintained. However, for safety reasons and/or regulations, nearly 15% of the survey data were collected at a flying height greater than 250 m, including more densely populated areas such as Richmond, Virginia, Roanoke Rapids, North Carolina, and Rocky Mount, North Carolina, or areas with tall-standing towers. The survey approximately covers a 232-kilometer x 70-kilometer semi-rectangular area; a total of 64,266 line-kilometers (km) of data were collected. The survey took place January-April 2021.

References:

Shah, A.K., 2014, Airborne Geophysical Surveys over the 2011 Mineral, Virginia, Earthquake Area: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F78K773V.

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Contacts

Point of Contact :: Anjana K Shah
Originator :: Anjana K Shah, Dylan M Connell
Metadata Contact :: Dylan M Connell, GS GGGSC DM Team
Publisher :: U.S. Geological Survey
USGS Program :: Mineral Resources Program
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: Geology, Geophysics, and Geochemistry Science Center
USGS Mission Area :: Energy and Minerals

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VA21F0025_VA-NC_TiZrREE_FGDCmetadata.xml Original FGDC Metadata	View	28.92 KB	application/fgdc+xml
VA21F0025_VA-NC_TiZrREE_FallZone_Geophysical_Survey_Report.pdf “Contractor Report”		4.05 MB	application/pdf
“Contractor Final Deliverables”		2.8 GB	application/x-zip-compressed
VA21F0025_VA-NC_TiZrREE_FallZone_Overview.png “Survey Overview Image”		3.34 MB	image/png
VA21F0025_VA-NC_TiZrREE_Survey_Linepath.zip “Survey Flightlines”		742.19 KB	application/zip

Shapefile: VA21F0025_VA-NC_TiZrREE_Footprint.zip
VA21F0025_VA-NC_TiZrREE_Footprint.cpg		5 Bytes
VA21F0025_VA-NC_TiZrREE_Footprint.dbf		75 Bytes
VA21F0025_VA-NC_TiZrREE_Footprint.prj		402 Bytes
VA21F0025_VA-NC_TiZrREE_Footprint.sbn		132 Bytes
VA21F0025_VA-NC_TiZrREE_Footprint.sbx		116 Bytes
VA21F0025_VA-NC_TiZrREE_Footprint.shp “Survey Footprint Shapefile”		5.9 KB
VA21F0025_VA-NC_TiZrREE_Footprint.shx		108 Bytes

Related External Resources

Type: Citation

The Earth Mapping Resources Initiative (Earth MRI): Mapping the Nation’s Critical Mineral Resources	https://doi.org/10.3133/fs20193007

Type: Web Link

Earth Mapping Resources Initiative (Earth MRI)	https://www.usgs.gov/special-topics/earth-mri

Purpose

The magnetic and radiometric survey was flown to support U.S. Geological Survey (USGS) efforts to better understand and evaluate mineral resources in the region, conduct geologic mapping, and evaluate risk due to earthquake hazards.

Airborne magnetic and radiometric survey, Virginia and North Carolina Fall Zone, 2021

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