Abstract

Many diagenetic replacements in sedimentary rocks occur along thin solution films between the authigenic and host phases. Rather than conventionally invoking bulk pore-water undersaturation for host-phase dissolution, we propose that many diagenetic replacements occur by a force of crystallization-controlled replacement mechanism whereby nonhydrostatic stresses resulting from authigenic crystal growth are principally responsible for host-phase dissolution. This model explains diagenetic features such as the restriction of host-phase dissolution to authigenic-host crystal contacts and euhedral authigenic crystal faces in planar contact with unreplaced host phases, as well as the relative replacement tendencies of some common authigenic minerals.

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