Modeling Diagenetic Bedding, Stylolites, Concretions, and Other Mechanochemical Structures

Abstract

A quantitative reaction-transport-mechanical model of pressure solution is used to explain a variety of differentiated features in carbonate rocks. The development of stylolites, bands of compaction alternating with bands of augmented cementation, and carbonate bands in sandstones are shown to be the consequence of an unstable dynamic that takes place during compaction. This dynamic leads to the intensification of textural contrasts during burial diagenesis. The quantitative model allows for the prediction of the range of existence and properties of these phenomena with respect to constraints. These constraints include carbonate grain size, clay content, burial and thermal history, and fluid chemistry.