Abstract
Many floor-fractured craters on the Moon show surface deformation like that seen over terrestrial laccoliths. Consequently, terrestrial laccoliths provide one model for such crater modification. This model directly relates surface deformation to the growth of a shallow, crater-centered intrusion, and it estimates intrusion size and magma pressure. It also yields a minimum estimate for intrusion depth. Maximum intrusion depths cannot be directly constrained, but a range of likely intrusion depths can be derived with additional assumptions. When the model is applied to the crater Taruntius, the surface record indicates an intrusion ∼30 km across and 1900 m thick. The calculated excess magma pressure is ∼9 MPa (90 bar), and the estimated intrusion depths range from ∼1 to ∼5 km. If magma pressure reflects a hydrostatic magma column beneath Taruntius, these values suggest a total magma column length of ∼65 km during crater modification.
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