Fact Sheet 2011–3130
What is the AGDB?
The Alaska Geochemical Database (AGDB) is a new, comprehensive compilation of geologic, spatial, descriptive, mineralogical, and analytical geochemical data for samples collected in Alaska and surrounding waters by the U.S. Geological Survey (USGS) from 1962 to 2009.
Data for geologic materials (rocks, minerals and mineral separates, soils, lake sediments, bulk stream sediments, and a variety of heavy-mineral concentrates) will be released as a two-sided DVD (USGS Digital Data Series DS 637 v. 1.0) in October of 2011. Future data releases will include water, organic and leachate samples.
The AGDB contains all Alaskan data from USGS legacy databases (for example, the RASS and PLUTO systems), and all results produced by USGS in-house and contract chemistry laboratories through December 2009. The database includes geochemical data resulting from the reanalysis of archived materials, such as those from the Alaska Mineral Resource Assessment (AMRAP) and National Uranium Resource Evaluation (NURE) programs, for additional elements and by newer methods. Reanalyses include samples collected statewide as part of the National Geochemical Survey, and samples from a project across the Alaska Range (data released in 2010). The AGDB also contains data for geologic materials from Alaska submitted by USGS researchers to non-USGS and non-contract labs, and a variety of other Alaskan geologic materials samples.
What types of samples are included?
For these geological materials, 9,667,206 individual geochemical analyses of 160 elements and chemical species by 85 different analytical methods are reported. Mineralogic identifications by optical microscopy are available for 18,138 of the heavy mineral concentrates.
Data in the AGDB have undergone extensive quality control screening including searching field notes and maps for accurate location information, verifying media and sample type, linking analytical data to geologic parameters recorded by the submitter, and documenting sample preparation and analytical methods.
The AGDB v. 1.0 two-sided DVD includes:
Map of Alaska (AK) showing the localities of rock and mineral samples (in blue), overprinted by sediment, soil, and bulk- and processed-concentrate samples (in red) included in v. 1.0 of the AK Geochemical Database. In areas of dense sampling, red dots obscure underlying rock and mineral samples.
For More Information
On sample media or analytical methods:
Text prepared by Jeanine M. Schmidt and Matt Granitto
The USGS Mineral Resources Program is the sole Federal provider of research and information on nonfuel mineral resources.
First posted October 18, 2011
For additional information contact:
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Schmidt, J.M., and Granitto, Matthew, 2011, The Alaska Geochemical Database: v. 1.0 – Geologic Materials: U.S. Geological Survey Fact Sheet 2011-3130, 2 p.