Southwick, David LChandler, V.W.McSwiggen, Peter L2023-08-242023-08-242023https://hdl.handle.net/11299/256104Geophysical models and petrologic inferences presented here are consistent with a buried gabbroic to noritic intrusion as the principal source of two geographically coincident, kilometer-scale, inversely correlated gravity and magnetic anomalies (the Garvin anomalies) located within Archean continental crust near the present-day southern margin of the Superior Craton in Minnesota. Two-dimensional profiles modeled from the total magnetic anomaly, reduced to pole, and the Bouguer gravity anomaly, upward-continued to 2 kilometers, are fit to geologically reasonable distributions of source rocks that have density and magnetic susceptibility values within the ranges reported for gabbro or norite intrusions.enGeologyMinnesotaGeophysicalPetrologicAeromagneticBouguer GravityPrecambrianGneissGarvinReport