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The USGS Soil Geochemical Landscapes of the Conterminous United States Project (2011-2015) published national-scale geochemical and mineralogical data and maps for soils of the conterminous U.S., published in USGS Data Series 801 (Smith and others, 2014; Smith and others, 2013) and available as an interactive mapping web site. Users can view all the maps and download them in a variety of formats, including KML files that can be opened directly into Google Earth. However, interpretive products to explain the major geochemical and mineralogical patterns observed for each element and mineral have not been published.
We will publish interpretive products based on the existing national-scale geochemical and mineralogical data and maps for soils of the conterminous U.S. In addition to these publications, we will add explanations of the major geochemical and mineralogical patterns observed for each element and mineral shown on this site.
These data and maps are a valuable tool in policy and decision-making. Possible interpretive products will show:
In addition, the Mexican Geological Survey is nearing completion of chemical analysis on soil samples collected throughout Mexico. We hope to merge our data sets to produce geochemical maps of the two countries combined.
There are a variety of stakeholders who provided positive comments when the soil geochemical and mineralogical data and maps were published. The additional interpretive publications and resulting enhanced interactive data and map portal will facilitate the stakeholders' ability to understand the abundance and spatial distribution of chemical elements and minerals in soils of the conterminous U.S.
Smith, D.B., Cannon, W.F., Woodruff, L.G., Solano, Federico, and Ellefsen, K.J., 2014, Geochemical and mineralogical maps for soils of the conterminous United States: U.S. Geological Survey Open-File Report 2014–1082, 386 p., http://dx.doi.org/10.3133/ofr20141082.
Smith, D.B., Cannon, W.F., Woodruff, L.G., Solano, Federico, Kilburn, J.E., and Fey, D.L., 2013, Geochemical and mineralogical data for soils of the conterminous United States: U.S. Geological Survey Data Series 801, 19 p., https://pubs.usgs.gov/ds/801/.
de Caritat, P., Reimann, C., Smith, D.B., and Wang, X., 2017, Chemical elements in the environment: Multi-element geochemical datasets from continental to national scale surveys on four continents: Applied Geochemistry, In Press, Accepted Manuscript - available online 2 December 2017, doi:10.1016/j.apgeochem.2017.11.010.
Eckley, C.S., Tate, M.T., Lin, C.-J., Gustin, M., Dent, S., Eagles-Smith, C., Lutz, M.A., Wickland, K.P., Wang, B., Gray, J.E., Edwards, G.C., Krabbenhoft, D.P., Smith, D.B., 2016, Surface-air mercury fluxes across Western North America: A synthesis of spatial trends and controlling variables: Science of The Total Environment, 568, p. 651-665, doi:10.1016/j.scitotenv.2016.02.121.
Ellefsen, K.J., and Smith, D.B., 2016, Manual hierarchical clustering of regional geochemical data using a Bayesian finite mixture model: Applied Geochemistry, 75, p. 200-210, doi:10.1016/j.apgeochem.2016.05.016.
Ellefsen, K.J, and Smith, D.B., 2016, User's guide for GcClust—An R package for clustering of regional geochemical data: U.S. Geological Survey report Techniques and Methods 7–C13, 21 p., https://doi.org/10.3133/tm7c1.
Ellefsen, K.J., Woodruff, L.G., Smith, D.B., Cannon, W.F., and Solano, F., 2016, Clustering of Soil Geochemical and Mineralogical Data from the Conterminous United States Using a Bayesian Finite Mixture Model: Joint Statistical Meeting (JSM) 2016 Proceedings Book, July 30-August 4, 2016, Chicago, IL. View Ellefsen 2016 abstract.
Servicio Geológico Mexicano (Mexican Geological Survey)
Eastern Mineral and Environmental Resources Science Center