『Abstract
　The complexity of silicate minerals makes prediction of their dissolution rates a challenging problem. A combination of large cluster ab-initio quantum mechanical models and chemical probe dissolution experiments are used to understand the dissolution process for olivine-group minerals. Rapid release of M²⁺ cations by precursor reactions involving H⁺ attack at μ3-O surface sites produces a silica-enriched surface. Slower rates of silica release via a ligand exchange reaction involving a proton in the activated complex controls the overall rate of olivine dissolution. Our results provide a physical explanation for the correlation among olivine dissolution rates and water exchange rates for the corresponding aqueous cation.

Keywords: Forsterite; dissolution rate; quantum mechanical model; ligand promoted; proton promoted』

Introduction
Methods
Acknowledgments
Referenced cites

FIGURE 1. Rates of forsterite dissolution. (a) reported dissolution rates as a function of pH in the absence of organic ligands (Pokrovsky and Schott 2000b; Rosso and Rimstidt 2000). (b) comparison of our measured rates in 〜0.02 M oxalate solutions with the rates in the absence of organic ligands. (c) speciation of oxalate as a function of pH shows that the pH dependence of the rates decreases as oxalate anions hydrolyze to bioxalate and oxalic acid suggesting a much weaker effect of bioxalate anion on rates. 〔Liu et al.(2006)による〔『Mechanism for the dissolution of olivine series minerals in acidic solutions』（455p）から〕

• Pokrovsky,O.S. and Schott,J.(2000b): Kinetics and mechanism of forsterite dissolution at 25℃ and pH from 1 to 12. Geochimica et Cosmochimica Acta, 64, 3313-3325.
• Rosso,J.J. and Rimstidt,J.D.(2000): A high resolution study of forsterite dissolution rates. Geochimica et Cosmochimica Acta, 64, 797-811.