Partitioning of elements between silicate melt and H 2 O-NaCl fluids at 1.5 and 2.0 GPa pressure: Implications for mantle metasomatism

Details Partitioning of elements between silicate melt and H 2 O-NaCl fluids at 1.5 and 2.0 GPa pressure: Implications for mantle metasomatism Partitioning of elements between silicate melt and H 2 O-NaCl fluids at 1.5 and 2.0 GPa pressure: Implications for mantle metasomatism

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.4237a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 20, pp.4237-4246

Computer Science

8

Scientific paper

Partition coefficients between a synthetic andesite melt and 1.5 and 3.0 molal ( m ) NaCl-H 2 O fluids have been measured at 1.5-2.0 GPa and 1250°C. Use of the double-capsule method allowed collection of silicate glass and of solute quenched from the fluid. Measured solubilities of silicate melt in both 1.5 m and 3.0 m NaCl fluid are 51 wt% at 1.5 GPa and 53 wt% at 2.0 GPa, much higher than solubilities measured for pure H 2 O at the same conditions. Wet chemical analysis of the run products yielded fluid/melt partition coefficients ( D fluid/melt ) ranging from 0.43 to 1.31 for Ca, Mg, Na, K, Rb, Sr, La, Sm, Y, Tm, and Ti, suggesting a near-congruent dissolution of the melt in fluid. D values for many elements increase in direct proportion to melt solubility, as expected for congruent solution. Concentrations of alkalis in the fluid positively correlate with total Cl concentration, suggesting that Cl complexes with alkalis in the fluid. Results imply that NaCl-bearing aqueous fluids can dissolve large amounts of silicate material, but do not strongly fractionate elements in equilibrium with silicate melts. Thus, the geochemical signature left by metasomatic H 2 O-NaCl fluids will not be distinctly different from that of silicate melts.

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