The density of one rock unit relative to another. Density contrasts can be either positive or negative. For example, if Rock A = 2.30 g/cm3 and Rock B = 2.40 g/cm3 then the density contrast of Rock A relative to Rock B is -0.10 g/cm3. Conversely, the relative density contrast of Rock B relative to Rock A is +0.10 g/cm3.

Gravity anomalies caused by density contrasts within the earth’s sedimentary section, crust and sub-crust can be analyzed and interpreted as lithologic and/or structural anomalies.

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