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- W2601335672 abstract "Andesite-H_2O and basalt-H_2O mixtures encapsulated in Pt, Ag_(30)Pd_(70), and Ag_(75)Pd_(25) withhigh ratios of metal/sample were run in half-inch diameter piston-cylinder apparatus at 30kbar at temperatures where the mixtures were molten or partly crystallized. For andesiteliquid at l 100°C the rate of iron absorption by the capsules is greatest in the first hour, 70percent of initial FeO being lost with Pt capsules. After 3 hours, percentages of initial FeOlost are 85 percent for Pt, 35 percent for Ag_(30)Pd_(70), and 25 percent for Ag_(75)Pd_(25). For the phaseassemblage garnet(Ga) + clinopyroxene(Cpx) + liquid(L) with 80 percent L at 1100°C inAg_(75)Pd_(25) capsules, clinopyroxene and liquid lose about 30 percent FeO in the 4-hour intervalbetween 1 and 5 hour runs, but garnet does not change composition. Distribution coefficientsfor Fe and Mg between liquid and minerals therefore vary as a function of run duration. At1000°C and below, iron loss is not a serious problem in Ag_(30)Pd_(70) for runs of 10 hours duration,but attempts to reverse the Cpx-out phase boundary in andesite-10% H_2O near 950°Cdemonstrate kinetic and nucleation problems; the reversal bracket is wide, 890°-975°C. Consistencybetween one-stage and two-stage low-to-high temperature runs for andesite andbasalt with at least 10 percent H_2O between 1050°C and 1200°C suggests a close approach toequilibrium for garnet and clinopyroxene after 1-hour runs. For runs with basalt-H_2O in Ptcapsules, longer runs cause the recorded positions of the Cpx-out and Ga-out phase boundariesto increase and decrease in temperature, respectively, with discrepancies of 25-50°Cbetween runs of 1 hour and 12 hours. This makes it difficult to demonstrate reversibleequilibrium of a high-temperature phase boundary in a rock-H_2O system; reversibility in asystem of changing bulk composition is not necessarily an equilibrium condition." @default.
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- W2601335672 date "1975-08-01" @default.
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- W2601335672 title "Effect of iron absorption by noble-metal capsules on phase boundaries in rock-melting experiments at 30 kilobars" @default.
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