The role of structural iron oxidation in the weathering of trioctahedral micas by aqueous solutions

Abstract

Introduction 8 Survey of existing methods 8 Choice of method 12 Experimental Reagents Apparatus 15 Mineral samples Methods Results and Discussion Standardization of reagents Modifications to the assay procedure. .. .. .. 25 Interferences and corrections Recommended method Conclusions CHAPTER III. THE ESTIMATION OF OCTAHEDRAL AND TETRAHEDRAL CATION SHEET OCCUPANCIES IN TRIOCTAHEDRAL MICAS BY AN X-RAY DIFFRACTION TECHNIQUE 50 iii Results and Discussion 64 Fractional coordinates 64 Sensitivity of OOA reflections 67 Observed data 71 Cation site occupancies 77 Summary and Conclusions 90 CHAPTER IV. OXIDATIVE WEATHERING OF TRIOCTAHEDRAL MICAS BY BUFFERED HgOg SOLUTIONS-1. OXIDATION AND THE KINETICS OF DISSOLUTION 92 Experimental 94 Micas Weathering solutions Apparatus Experimental design Effluent analyses Kinetic model 103 Results and Discussion Oxidation Dissolution Kinetics of dissolution Conclusions 132 CHAPTER V. OXIDATIVE WEATHERING OF TRIOCTAHEDRAL MICAS