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- W296498360 abstract "Many laboratory experiments have been performed on the stabilities of analcime, stilbite, laumontite, wairakite, lawsonite and prehnite. Stabilities reported for most experiments in which fluid pressure equals 2 kb total pressure are: stilbite--less than 170/sup 0/C, laumontite--170/sup 0/ to 280/sup 0/C, and wairakite--280/sup 0/ to 385/sup 0/C. These three minerals are stable only below 3 kb fluid pressure. At higher fluid pressures, laumontite breaks down to lawsonite + quartz + H/sub 2/O, and wairakite reacts with H/sub 2/O to form prehnite + montmorillonite + quartz. Analcime + quartz together are stable below 4 kb and 200/sup 0/C. Under conditions where fluid pressure is less than total pressure, the stability fields of these zeolites are encroached by those of blueschist facies and prehnite-pumpellyite facies minerals in the higher pressure region and by those of greenschist facies minerals in the higher temperature region. At lower H/sub 2/O activities caused by dissolved substances, these zeolites would occur at lower P--T conditions than those determined by the experiments. For example, the upper stability temperature of laumontite is about 10/sup 0/C lower in an 0.25 N NaCl solution. Laumontite is stable in the CO/sub 2/-bearing fluid at 1 kb fluid pressure and 260/sup 0/C withmore » maximum mol fraction of CO/sub 2/ of 0.023. At higher CO/sub 2/ contents, calcite + montmorillonite + quartz are stable. The stability data for these zeolites, together with our recent results on the relations of pumpellyite, prehnite-lawsonite, and wairakite-anorthite, permit delineation of the P--T paths for various observed mineral parageneses documented in the literature.« less" @default.
- W296498360 created "2016-06-24" @default.
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- W296498360 date "1977-02-01" @default.
- W296498360 modified "2023-09-28" @default.
- W296498360 title "Review of stabilities of analcime and some calcium zeolites. [Stilbite, lawsonite, prebnite, laumontite, and wairakite]" @default.
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