INTERACTION BETWEEN MINERALS AND FLUIDS UNDER HYDROTHERMAL CONDITIONS, WITH SPECIAL EMPHASIS ON THE COMPOSITION OF THE MINERAL'S SURFACE AND ON THE TRACE ELEMENT CONTENT OF THE AQUEOUS PHASE
The interaction between silicate minerals and reactive aqueous fluids at 200 degrees C may result in partial dissolution and/or formation of solid alteration products. The nature and the kinetics of the reactions between selected minerals (with special emphasis on lepidolite and acmite/augite) and acid to neutral aqueous solutions are studied. Special attention is paid to the elemental composition (major, minor and trace elements) of the resulting contact solution. The morphology and the surface composition of the altered starting minerals are examined by electron microprobe analysis, SIMS depth profiling and/or imaging SIMS, and laser microprobe mass analysis. In some hydrothermal experiments the aqueous phase contained D-2O or H-2**180 as markers. In the case of acid solutions etch pits can be observed in the mineral's surface but no chemical gradients for any element, including hydrogen. For more neutral solutions chemical gradients are built up through the formation of secondary minerals, which may contain hydrogen (deuterium) from the solution.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON WATER-ROCK INTERACTION, MISASA (JAPAN), AUG. 29-SEPT. 3, 1983 - WRITE TO CEC LUXEMBOURG DG XIII/A2, POB 1907 MENTIONING PAPER E 31152
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Record Number: 1989122022800 / Last updated on: 1987-01-01
Available languages: en