Chemical reactions between fluids and minerals continuously reshape porous and fractured rocks. Dissolution, precipitation, cementation, and mineral replacement alter pore geometry and connectivity, changing the pathways through which fluids and solutes reach reactive sites. The resulting feedbacks between reaction and transport can amplify or suppress heterogeneity and generate recognizable structures across a wide range of spatial and temporal scales. This can be illustrated by acidization wormholes, karst networks, reactive melt channels in magmatic rocks, and diagenetic features such as concretions, reaction fronts and precipitation and/or dissolution patterns.

The underlying challenge is common to all of them: how reactions in individual pores become expressed as large-scale patterns and as changes in porosity and permeability — a question shared across sedimentology, geochemistry, hydrology, petrophysics, and geophysics. It matters wherever reactive flow must be predicted or engineered: carbon storage and mineralization, hydrogen production, geothermal energy, hydrocarbon recovery, nuclear waste repositories, and contaminant transport and remediation.

This field covers approaches, methodologies, and scales of a wide variety. X-ray imaging, microfluidics, and other in situ methods now resolve local mineral reactions as the geometry of the medium evolves. Computational advances bridge pores, fractures, laboratory samples, and field systems. Rock record study shows how these processes accumulate and interact over geological time, on timescales no experiment can reach.

Thereby, we invite contributions on reactive transport and diagenesis from experiments, field observations, theory, and computation. Studies may address dissolution, precipitation, cementation, mineral replacement, authigenesis, water-rock interaction, or biogeochemical transformations. They should investigate the consequences of these processes on porosity, permeability, flow localization, and pattern formation. Work at any scale is welcome; from single pores and table-top experiments to hydrogeological systems and sedimentary basins.