Distribution des éléments Na, K, Rb et Cs à l'état de trace entre feldspaths alcalins et solutions hydrothermales à 650° C, 1 kbar: données expérimentales et interpretation thermodynamique

Details Distribution des éléments Na, K, Rb et Cs à l'état de trace entre feldspaths alcalins et solutions hydrothermales à 650° C, 1 kbar: données expérimentales et interpretation thermodynamique Distribution des éléments Na, K, Rb et Cs à l'état de trace entre feldspaths alcalins et solutions hydrothermales à 650° C, 1 kbar: données expérimentales et interpretation thermodynamique

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2617l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 12, pp.2617-2640

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Scientific paper

New experimental data on alkali metals (Na, K, Rb and Cs) distribution between alkali feldspars and aqueous vapor phases are presented. All experiments were conducted at 650°C, 1 kbar, in the presence of solutions of 2 molar total alkali chloride concentration. Three types of experiments have been performed: 1. 1. Exchange reactions, involving two elements i and j , between a feldspar solid solution f ( ij ) and an aqueous vapor phase. Three systems (Na-K, K-Rb and Na-Rb) have been investigated. 2. 2. Distribution of a trace element i (Na, K, Rb or Cs) between a feldspar f ( j ) (Na, K or Rb) and an aqueous vapor phase. Nine equilibria have been studied. 3. 3. Distribution of a trace element i (Na, Rb or Cs) between a feldspar f ( jk ) (Na-K or K-Rb) and an aqueous vapor phase. Four equilibria have been studied. A thermodynamic interpretation of the experimental results has been developed. In the binary equilibria of type 2, the trace element distribution depends on a constant related to the thermodynamic properties of the pure phase f ( j ) and on another term, related to the deviation of the solid solution f ( ij ) from the ideality. In the ternary equilibria of type 3, theoretical considerations indicate that the trace element distribution cannot be evaluated by a simple extrapolation between the end members. When the excess molal Gibbs free energy of the solid solution f ( jk ) is strongly positive, the trace element is more easily accepted in the intermediate members of the series than in the end members. The Rb and Cs distributions in the albite-sanidine solid solutions are consistent with this theory. Crystallochemical relationships are established between the thermodynamic properties of the minerals and the ionic radii of their alkali metals.

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