Effet de la température sur les distributions de Na, Rb et Cs entre la sanidine, la muscovite, la phlogopite et une solution hydrothermale sous une pression de 1 kbar

Details Effet de la température sur les distributions de Na, Rb et Cs entre la sanidine, la muscovite, la phlogopite et une solution hydrothermale sous une pression de 1 kbar Effet de la température sur les distributions de Na, Rb et Cs entre la sanidine, la muscovite, la phlogopite et une solution hydrothermale sous une pression de 1 kbar

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..267v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 3, pp.267-282

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Scientific paper

The distribution of trace amounts of Na, Rb and Cs, between muscovite, phlogopite, sanidine and hydrothermal solution have been studied by ion exchange in a temperature range from 400 to 800°C. These distributions have been expressed with a partition ratio P aq - m x = ( X / K ) aq /( X / K ) m (where X is Na, Rb or Cs). In the case of Na and Cs in muscovite, even for the dilute solutions, the ratio P aq - m x is not the equilibrium constant k x of exchange reactions. In other cases, P aq - m x does not depend on the trace alkali ion concentration in silicates (X) and is equal to k x . Variations of P x or k x with T are greater for Na and Cs than for Rb. Generally, k x decreases with increase in T . The function log P x = f (1/ T ) is not linear for Na or Cs, but in the case of Rb, f (1/ T ) is linear and the standard enthalpy and entropy of exchange reactions have been estimated by applying the Arrhenius relation. The distribution relations obtained between silicate and vapour phase permit the determination of distributions of Na, Rb and Cs between two minerals mI and mII, relative to K. These have been expressed with the partition ratio Q x =( X / K ) mI /( X / K ) mII . Variations of Q x with T are not remarkable, and even for Rb between phlogopite and feldspar are negligible. Nevertheless, one may use the distributions of Rb and Cs between muscovite and feldspar for geothermometry. Experimental results have been applied to some rocks by effecting corrections from the major element composition of the natural minerals. Estimated temperatures are near to 400°C in the granites and pegmatite studied here.

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