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Figure 4.
Gravity anomalies expected at various stages in rift evolution, based on model for the Midcontinent Rift under Lake Superior. During rifting, dense volcanics cause a large positive anomaly. Subsequent deposition of low-density sediments and associated subsidence cause a gravity low. Inversion of the rift and erosion of low-density sediments cause the high observed today. Densities in g/cm3. (After Elling et al., 2020.)
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