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Data Series 637

Alaska Geochemical Database (AGDB)—Geochemical Data for Rock, Sediment, Soil, Mineral, and Concentrate Sample Media

By Matthew Granitto, Elizabeth A. Bailey, Jeanine M. Schmidt, Nora B. Shew, Bruce M. Gamble, and Keith A. Labay

Thumbnail of and link to pamphlet PDF (18.5 MB)Abstract

The Alaska Geochemical Database (AGDB) was created and designed to compile and integrate geochemical data from Alaska in order to facilitate geologic mapping, petrologic studies, mineral resource assessments, definition of geochemical baseline values and statistics, environmental impact assessments, and studies in medical geology. This Microsoft Access database serves as a data archive in support of present and future Alaskan geologic and geochemical projects, and contains data tables describing historical and new quantitative and qualitative geochemical analyses. The analytical results were determined by 85 laboratory and field analytical methods on 264,095 rock, sediment, soil, mineral and heavy-mineral concentrate samples. Most samples were collected by U.S. Geological Survey (USGS) personnel and analyzed in USGS laboratories or, under contracts, in commercial analytical laboratories. These data represent analyses of samples collected as part of various USGS programs and projects from 1962 to 2009. In addition, mineralogical data from 18,138 nonmagnetic heavy mineral concentrate samples are included in this database. The AGDB includes historical geochemical data originally archived in the USGS Rock Analysis Storage System (RASS) database, used from the mid-1960s through the late 1980s and the USGS PLUTO database used from the mid-1970s through the mid-1990s. All of these data are currently maintained in the Oracle-based National Geochemical Database (NGDB). Retrievals from the NGDB were used to generate most of the AGDB data set. These data were checked for accuracy regarding sample location, sample media type, and analytical methods used. This arduous process of reviewing, verifying and, where necessary, editing all USGS geochemical data resulted in a significantly improved Alaska geochemical dataset. USGS data that were not previously in the NGDB because the data predate the earliest USGS geochemical databases, or were once excluded for programmatic reasons, are included here in the AGDB and will be added to the NGDB. The AGDB data provided here are the most accurate and complete to date, and should be useful for a wide variety of geochemical studies. The AGDB data provided in the linked database may be updated or changed periodically. The data on the DVD and in the data downloads provided with this report are current as of date of publication.

Revised October 30, 2012
First posted October 18, 2011

  • Metadata files
    The metadata for this report has been updated. Use these files for the most current version.
  • http://tin.er.usgs.gov/agdb/
    The Alaska Geochemical Database (AGDB) is also presented on-line at the USGS Mineral Resources On-Line Spatial Data website as interactive and searchable spatial data, where user defined data views and downloads are available in a number of options.

For additional information contact:

Center Director,
USGS Central Mineral
and Environmental Resources Science Center

Box 25046, Mail Stop 973
Denver, CO 80225

Part of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

Granitto, Matthew, Bailey, E.A., Schmidt, J.M., Shew, N.B., Gamble, B.M., and Labay, K.A., 2011, Alaska Geochemical Database (AGDB)—Geochemical data for rock, sediment, soil, mineral, and concentrate sample media: U.S. Geological Survey Data Series 637, 31 p. pamphlet and database, 1 DVD. Available at http://pubs.usgs.gov/ds/637. (Revised October 2012)



Contents

Abstract

Introduction

Geographic Setting

Methods of Study

Characteristics of the Relational Database

Acknowledgments

References

Appendix 1: Analytical Methods

Appendix 2: Database Query Examples

Appendix 3: Data Enhancement, Correction, and Processing


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