Geochemical characterization of solid media from three watersheds that transect the basal contact of the Duluth Complex, northeastern Minnesota

Metadata Updated: November 12, 2020

To document regional water quality in areas of potential base-metal mining, bedrock, soil, streambed sediment, and surface-water samples were collected and analyzed in three watersheds that cross the basal part of the Duluth Complex (northeastern Minnesota). The three watershed each had different mineral-deposit settings: (1) copper-nickel-platinum group element mineralization (Filson Creek), (2) iron-titanium-oxide mineralization (St. Louis River), and (3) no identified mineralization (Keeley Creek). At least 10 bedrock, 30 soil (two from 15 sites), and up to 13 streambed sediment samples were collected in each watershed and analyzed for 44 major and trace elements by a combined method using a combined inductively coupled plasma atomic emission spectrometry and mass spectrometry method (ICP-AE/MS), total and inorganic carbon, mercury and selenium by individual element methods, and 10 loosely bound metals (when possible). All analyzes were completed at the USGS contract lab using the sample analytical methods. Bedrock sample sites were chosen to provide comprehensive surficial bedrock chemistry within each watershed. Soil sample sites were selected by their proximity to bedrock sites, or to sample a range of glacial landscape features. Streambed sediment sample sites were selected in coordination with water quality sample sites and where surface mineralization was present.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date February 21, 2019
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2019 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date February 21, 2019
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2019 (publication)
Responsible Party USGS Midwest Region (Point of Contact)
Contact Email
Access Constraints Use Constraints: none, Access Constraints: none
Bbox East Long -91.636600000001
Bbox North Lat 47.83965
Bbox South Lat 47.38366
Bbox West Long -92.188799999996
Coupled Resource
Frequency Of Update notPlanned
Licence All data. metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2012-01-01
Temporal Extent End 2015-01-01

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