Aeromagnetic Anomalies Midcontinent Rift System
By Geology, Geophysics, and Geochemistry Science Center
September 2003 (approx.)
Detailed Description
Regional aeromagnetic anomalies over the Midcontinent Rift System region. White dots show locations of known Keweenawan nickel-copper-platinum group element (Ni-Cu-PGE) mineral deposits. Gray block pattern shows area of Phanerozoic sedimentary cover. Red polygon shows location of northeast Iowa Intrusive Complex (NE IIC).
Sources/Usage
Public Domain.