Abstract
Post‐depositional remanent magnetization (PDRM) becomes permanent within a lock‐in zone, whose apparent time delay (depth) and time span (thickness) are related to the characteristic time constants of compaction and magnetic grain rotation. Two simple models of the PDRM lock‐in zone are described, using Yaskawa's idea of effective sedimentary viscosity, and Mooney's empirical relation for the viscosity of a concentrated suspension of spheres. The impulse response of the lock‐in zone determines the fidelity of the paleomagnetic recording.
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