Compositional analysis of texture and very coarse sand lithology have been used to support characterization of till properties, and interpretation of correlation, process, and provenance. In 2007, results were released for more thorough compositional analyses of near-surface till samples collected statewide. Quaternary stratigraphic efforts are now focused on information needed to support regional groundwater management. To support that effort, till from selected rotasonic cores extending to tens of meters depth were submitted in 2018 and 2019 for geochemical analysis following the method used for part of the 2007 study - four-acid leach of air dry <63 micron fraction followed by ICP. Examples of elements that correlated to provenance are As in shale-rich till, Ca in carbonate-rich till, Na in shield-derived till, and Fe in Lake Superior-derived till. All data are here provided as a reference.
This Open File primarily consists of a large data set containing geochemical analyses for till sampled from drill core, with accompanying data for duplicates and standards, for the purpose of making the data available to users. It includes data from core analyzed in 2018 and 2019, and to facilitate analysis, it also includes compatible data from near-surface till samples release in 2007.
Appreciation is expressed to the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources, who funded this work in relation to groundwater protection priorities being carried out through the County Geologic Atlas Program.
Thorleifson, L.H.; Conrad, D.R.; Staley, A.E..
OFR19-02, Geochemical Analysis of Till From Minnesota Drill Cores.
Minnesota Geological Survey.
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