Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Acta Geologica Polonica

1 2001

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Analcime-wairakite

Sortuj według:

Ogranicz wyniki do:

Experimental investigation of the reaction : An-rich plagioclase + quartz + fluid = analcime-wairakite[ss]

Galbarczyk-Gąsiorowska L., Słaby E.

Acta Geologica Polonica

2001

Vol. 51, nr 2

155-162

The reaction An-rich plagioclase + quartz + fluid = analcime (NaAlSi4O12 * 2H2O) - wairakite (CaAl2Si4O12 * 2H2O)[ss] (solid solution series) has been studied experimentally in the temperature range 350-200 stopni C. Distilled water or 0.1 M NaHCO3 solution was used as fluid. All experiments have been performed under low silica activity. Due to the short duration of the experiments the reaction had not approached equilibrium and partly metastable phases were formed. Wairakite nucleated in the laumontite stability field in the system plagioclase-quartz-H2O. Higher sodium activites led to the formation of mixed analcime-wairakite crystals or analcime crystals. The mechanisms of zeolite formation seems to comprise topotaxial growth on the plagioclase surface caused by a dissolution-precipitation process. Some variations in the nucleation and growth kinetics were noticed which appear to be due to different physico-chemical conditions of zeolite formation