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Mg-Fe partitioning between biotite and a supercritical chloride solution

โœ Scribed by S. Schulien

Publisher
Springer
Year
1980
Tongue
English
Weight
779 KB
Volume
74
Category
Article
ISSN
0010-7999

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โœฆ Synopsis

An experimental study of the partitioning of Mg and Fe between synthetic biotite and an aqueous chloride solution in the supercritical region as a function of temperature, pressure and concentration of Mg and Fe is reported. In the temperature range 500 ~ 700 ~ C and the pressure range 25 200 MPa, the Mg-Fe distribution between biotite and the chloride solution can be described by distribution curves based on the ideal solution model within a data scattering of 8%. Mg is preferentially partitioned into biotite, and Fe prefers the solution. This tendency is enhanced with increasing temperature. The distribution constants for the Mg-Fe exchange reactions in the system K(Mg, Fe)3A1Si3010(OH)2 -(Mg,Fe)C12 -KC1 -H20 have been determined. The present data favor a model in which the activity of Fe and Mg in biotite is close to the mole fraction at temperatures above 500 ~ C. Comparison of the Mg-Fe partitioning between biotite-chloride solution and olivine-chloride solution reveals a slight enrichment of Fe in olivine relative to biotite.

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