Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2016
Title: Aerorad data
Geospatial_Data_Presentation_Form: raster digital data
Larger_Work_Citation:
Citation_Information:
Originator: Susan M. Karl (ed.)
Originator: James V. Jones, III (ed.)
Originator: Timothy S. Hayes (ed.)
Publication_Date: 2016
Title:
GIS-based identification of areas that have resource potential for
critical minerals in six selected groups of deposit types in Alaska
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 2016-1191
Other_Citation_Details:
The larger work includes data sets for mineral resource data, geochemistry
(stream sediment, rock, soil, mineral, and heavy mineral concentrate),
igneous rock geochemical indices, lithology, and aeroradiometric data.
Online_Linkage: http://dx.doi.org/10.3133/ofr20161191
Description:
Abstract:
Includes three raster files with data for thorium, uranium, and
thorium/potassium ratios from aerial gamma-ray surveys in Alaska. Data
was originally collected by contractors for the U.S. Department of
Energy as part of the National Uranium Resource (NURE) program during
the summer months of 1975, 1976, 1977, 1979, and 1980. For most of the
surveys, the flight line spacings are 10km and the lines are oriented
east-west. The nominal altitude of the aircraft above the ground was
122 meters. The U.S. Geological Survey processed these data to correct
scaling differences between surveys and to convert count rate data to
concentration values for potassium, uranium, and thorium. The processed
data were used to calculated grids with 5km grid cells.
Purpose:
Aerial gamma-ray surveys capture the radioactive signatures of bedrock and
surficial materials. The surveys measured the flux of gamma rays emitted
as a result of the radioactive decay of the naturally occurring
radioactive elements 40K, 238U, and 232Th. In this study, the processed
data is used in the analyses for REE-Th-Y-Nb, sandstone uranium, and
Sn-W-Mo in specialized granite deposit models.
Supplemental_Information:
The aerial gammy-ray surveys were originally published in Duval,
Joseph S., 2001, Aerial gamma-ray surveys in Alaska: U.S. Geological
Survey Open-File Report 01-128.
http://pubs.usgs.gov/of/2001/of01-128/
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1976
Ending_Date: 1980
Currentness_Reference: The aerial surveys were flown in 1976, 1977, 1979, and 1980.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -168.3
East_Bounding_Coordinate: -129.9
North_Bounding_Coordinate: 71.4
South_Bounding_Coordinate: 54.6
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: NURE
Theme_Keyword: National Uranium Resource Evaluation
Theme_Keyword: gamma-ray
Theme_Keyword: potassium
Theme_Keyword: uranium
Theme_Keyword: thorium
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation, 008
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Alaska
Access_Constraints: None
Use_Constraints:
None. Users are advised to read the publication text and metadata to
understand the appropriate use and data limitations.
Data_Set_Credit: Joseph S. Duval and Keith Labay
Native_Data_Set_Environment:
The previously published raster data sets were converted to tif files using
ESRI ArcGIS, version 10.2.