Chemical maps of Mars, derived from the Mars Odyssey 2001 mission’s gamma and neutron spectrometers, regionally characterize the distribution of key elements at depth scales unmatched by other missions. Resulting works address unknowns of the martian rock cycle, such as changes across Noachian-Amazonian eons in pathways from igneous rocks to sediment to lithification. Those span soil alteration processes across Mars, thermal evolution of the mantle, provenance of globally distributed dust, etc. However, unresolved questions remain, such as the provenance of chemical provinces, evolution of individual volcanic provinces, and processes enriching K and Th in the lowlands. Accordingly, we solicit presentations on the synthesis of in situ and regional observations; on geological interpretations from regional geochemistry; and on refining the chemical maps. Regional geochemical context for in situ regolith evolution as at Jezero Crater, geochemical constraints on geophysical properties, and analog studies to interpret geochemical signatures are similarly welcome.