Other
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1455v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 10, pp.1455-1461
Other
4
Scientific paper
Over several years many partition coefficients have been measured between framework silicates, sheet silicates and hydrothermal solutions. Only trace alkaline cations are considered in the present work. It is well known that the difference between ionic radii of the trace cation and the major cation is replaces is not satisfactory for a good correlation with the partition coefficients P X . A structural parameter c is therefore defined, taking into consideration the adaptation of the trace cation to the cavity in which it occurs. This cavity may be the entire site of the major element, or a part of this site in the case of small cations, or a structural cavity located out of the alkali-ion site. The adaptation parameter c is the difference between the ionic radius of the trace cation and the radius of that cavity. This paper shows that the partition coefficient P X of the trace alkali-ion from the hydrothermal solution is an exponential function of the adaptation parameter c , whatever the silicate may be.
Robert Jean-Louis
Volfinger Marcel
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