Kimberlites in Minnesota

Magnetic map

The ancient cratonic terranes of the MRV subprovince and its reworked equivalent in the Penokean orogen are peppered by small, subcircular aeromagnetic anomalies that are known from scattered drilling to reflect small mafic and ultramafic intrusions. The possibility that kimberlite pipes (possibly diamond-bearing) may lurk among the several hundred potential anomalies remains open to future investigation.

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