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This version of the online report provides complete access to NGS data, describes the history of the project, the methodology used, and presents preliminary geochemical maps for all analyzed elements.
This book stems from the multi-stage International Geochemical Mapping (IGM), an International Geological Correlation Programme (IGCP) project, to set up a global geochemical database on the distribution and quantities present of all 92 chemical elements in the surface of the earth. A comprehensive review and evaluation of methods for regional and national geochemical mapping and providing a recognized, global quantitative base on which local investigations can be built for particular environmental and economic problems concerning various aspects of land use.
Explorative geochemical data for over 860,000 samples from 104 quadrangles (1 degree x 2-3 degrees) in Alaska and 319 quadrangles (1 degree x 2 degrees) in conterminous United States collected during NURE HSSR program. Data represent four predominant sample types: stream sediment, soil, surface water, and ground water. Each sample was analyzed for uranium and for as many as 58 other elements plus sulfate. GSSEARCH and MAPPER search and display software are included on disc.
Provides access to geochemcial data from the conterminous United States. Using the GSSearch access software contained on the CD-Rom disk, users can retrieve the data by specifying sample type, quadrangle, latitude, longitude, element, element concentration range, or combinations of these and othercriteria. Data may be output to the user's system in several different formats for data analysis.
Provides access to geochemical data for the conterminous western United States. Using the GSSearch access software contained on the CD-ROM disk, users can retrieve the data by specifying sample type, state, quadrangle, latitude and longitude, element concentration range, or combinations of these and other criteria. Data may be output to the user's system in several different formats for data analysis.
Legacy geochemical and locality data for 414,304 rock, 397,625 soil and stream sediment, and 335,547 water samples acquired over the 100-year history of the U.S. Geological Survey are digitally compiled in the National Geochemical Database. Upcoming mineral environmental and resource assessments of the Nation will utilize some or all of these data to define geochemically anomalous areas. In such assess- ments it is advantageous to define the watershed from which sediment, soil, and water samples were derived. The goal of this study was to determine the most expedient methods to delineate and display the source catchments and hydrologic contributing areas of geochemically anomalous sediment, soil, and associated rock samples.