Browsing by Author "Ikola, Rodney J."

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    RI-04 Interpretation of Lake Washington Magnetic Anomaly, Meeker County, Minnesota
    (Minnesota Geological Survey, 1964) Sims, P.K.; Austin, G.S.; Ikola, Rodney J.
    A magnetic anomaly centered at Lake Washington, in southeastern Meeker County, has been outlined by a ground magnetometer survey. The anomaly is arcuate in outline, about 8.5 miles long and a maximum of 5 miles wide, and has a maximum amplitude greater than 3,000 gammas. A gravity traverse was made across the anomaly to aid in interpretation. Combined magnetic and gravity data are interpreted to indicate that the source is a basin-shaped body having a substantially greater density than the adjacent rocks that lies at a shallow depth. The lithology of the source is not known because of a lack of subsurface data, but is inferred to be either Precambrian iron-formation or mafic igneous rock. The anomaly warrants further investigation.