The Bras David watershed on the French island of Basse-Terre, Guadeloupe in the Lesser Antilles is located on a late Quaternary volcaniclastic debris flow of dominantly andesitic composition. The bedrock is mantled by more than 12 m of highly leached regolith. The regolith is depleted with respect to most primary minerals and weathering is dominated by the dissolution and precipitation of clays. Mineral nutrient cations such as Mg, K, and P are largely present adsorbed to, or co-precipitated with, clays and iron oxides. Surface soils (< 0.3 m depth) are enriched in feldspar, quartz, cristobalite, and Fe(II), Ca, K, and Mg relative to the underlying regolith, likely reflecting atmospheric deposition, possibly related to volcanic activity.