Title: Chapter 7 Formation of Stylolites, Marl/Limestone Alternations, And Dissolution (Clay) Seams by Unstable Chemical Compaction Of Argillaceous Carbonates
Abstract: Publisher Summary This chapter focuses on the reaction-transport modeling to describe the evolution of clay seams, stylolites, and marl/limestone alternations during chemical compaction in terms of a few coupled diagenetic processes. The model discussed in the chapter accounts for diffusional mass transport, texture-dependent effective stress distribution, different reaction rates and driving forces for reaction at grain contacts and at grain “free” faces, and rate inhibition due both to solute inhibitors and clay coatings. In particular, it is shown that the reaction rate at grain-grain contacts relative to that at free grain faces is one deciding factor between behaviors in porous rocks. As the rates vary with pore fluid chemistry, temperature, clay content, and amount of overgrowth cement at grain contacts, the response of a porous rock to pressure solution may vary widely with different conditions. In addition, an example of clay seam formation in a low-porosity calcite-clay rock is examined using a model developed in an earlier study. This model incorporates results on the elastic matrix-inclusion problem into reaction-transport formalism. The effect of enhanced diffusion at phyllosilicate-calcite grain boundaries on the length scale and timing of clay seam formation is explored in this limit of low porosity.
Publication Year: 1994
Publication Date: 1994-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 13
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