Na-Ba and K-Ba partitioning between feldspar and aqueous chloride solutions. Some consequences of unmixing in solids and fluids
European Journal of Mineralogy Volume 5 Number 3 (1993), p. 447 - 454
published: Jun 14, 1993
manuscript accepted: Feb 15, 1993
manuscript received: Jul 15, 1992
ArtNo. ESP147050503014, Price: 29.00 €
Abstract Experiments have been carried out at 600 and 750°C, 1.5 to 2.5 kbar, to determine the partitioning of Na and Ba or K and Ba ions between feldspars and aqueous chloride solutions. At these temperatures (Na,Ba)- feldspar unmixes near the sodic end-member and thus the solid solution is very far from ideality. On the other hand, the (K,Ba)-feldspar series deviates only slightly from ideality. The (Na,Ba) and (K,Ba) chloride solutions show a large domain of unmixing and their critical curves lie at higher pressure than for the other binary chloride solutions previously studied, i.e. 2 kbar at 600°C and 2.4 kbar at 750°C.