Zhang,L. and Luttge(uの頭に¨),A.(2007): Al,Si order in albite and its effect on albite dissolution processes: A Monte Carlo study. American Mineralogist, 92, 1316-1324.

『アルバイト(曹長石)におけるAlとSiの秩序的な配列およびそれが溶解過程に与える影響:モンテカルロ法による研究』


Abstract
 The role of (Al,Si) disorder in the kinetics of albite dissolution is explored through parameterized Monte Carlo methods. Two dissolution mechanisms−multilayer leaching and single-layer retreat−were tested on 48 albite test configurations. In simulations involving multilayer leaching, dissolution rates increased with decreasing long-range order (LRO). We observed a fivefold maximum increase in dissolution rate tied to (Al,Si) disordering, roughly equivalent to that accompanying a decrease of 1.4pH units at pH 1-5. This increase in rate due to disordering in albite is similar to that observed from compositional variation in plagioclase feldspars (An47 vs. An0) at low pH. In contrast, (Al,Si) disordering had no discernible effect during the simulations involving the single-layer retreat mechanism. These results suggest that the effect of (Al,Si) disorder on albite dissolution rate is mechanism-dependent.

Keywords: Long-range order; short-range order; disorder; albite; Monte Carlo; dissolution mechanism; kinetics』
Introduction
Definitions of LRO and SRO
Computer modeling
 Al,Si distributions with different LRO
 Minimization of SRO
 Dissolution modeling
 Visualization of site ordering: A 2D projection model
Results and discussion
 Configurations
 Role of oeder/disorder in albite dissolution
Acknowlwdgmenta
References cited



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