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Levelling and merging of two discrete national-scale geochemical databases: A case study showing the surficial expression of metalliferous black shales

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Abstract

Government-sponsored, national-scale, soil and sediment geochemical databases are used to estimate regional and local background concentrations for environmental issues, identify possible anthropogenic contamination, estimate mineral endowment, explore for new mineral deposits, evaluate nutrient levels for agriculture, and establish concentration relationships with human or animal health. Because of these different uses, it is difficult for any single database to accommodate all the needs of each client. Smith et al. (2013, p. 168) reviewed six national-scale soil and sediment geochemical databases for the United States (U.S.) and, for each, evaluated “its appropriateness as a national-scale geochemical database and its usefulness for national-scale geochemical mapping.” Each of the evaluated databases has strengths and weaknesses that were listed in that review.

Two of these U.S. national-scale geochemical databases are similar in their sample media and collection protocols but have different strengths—primarily sampling density and analytical consistency. This project was implemented to determine whether those databases could be merged to produce a combined dataset that could be used for mineral resource assessments. The utility of the merged database was tested to see whether mapped distributions could identify metalliferous black shales at a national scale.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Levelling and merging of two discrete national-scale geochemical databases: A case study showing the surficial expression of metalliferous black shales
Year Published 2015
Language English
Publisher The Association of Applied Geochemists
Contributing office(s) Central Mineral and Environmental Resources Science Center
Description 9 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title 27th International Applied Geochemistry Symposium
Conference Title 27th International Applied Geochemistry Symposium
Conference Location Tucson, AZ