Rates of weathering rind formation on Costa Rican basalt

  title={Rates of weathering rind formation on Costa Rican basalt},
  author={Peter B. Sak and Donald M. Fisher and Thomas W. Gardner and Katherine Murphy and Susan L. Brantley},
Weathering rind thicknesses were measured on 200 basaltic clasts collected from three regionally extensive alluvial fill terraces (Qt 1, Qt 2, and Qt 3) preserved along the Pacific coast of Costa Rica. Mass balance calculations suggest that conversion of unweathered basaltic core minerals (plagioclase and augite) to authigenic minerals in the porous rind (kaolinite, allophane, gibbsite, Fe oxyhydroxides) is iso-volumetric and Ti and Zr are relatively immobile. The hierarchy of cation mobility… CONTINUE READING
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