Feldspar-liquid equilibria in peralkaline acid liquids; an experimental study

The partitioning behavior of silver in a vapor–brine–rhyolite melt assemblage

“…The consistent results across a range of run times from 111 to 560 h suggest that the melts reached equilibrium with respect to major elements and chlorine in less than 5 days, consistent with previous experimental studies (Carmichael and MacKenzie, 1963;Thompson and MacKenzie, 1967;Bailey et al, 1974;Bailey and Cooper, 1978;Baker and Rutherford, 1996;Gaillard et al, 2001;Scaillet and MacDonald, 2001;Clemente et al, 2004). The calculated aluminum saturation index (ASI = the molar ratio of Al 2 O 3 /(Na 2 O + -K 2 O)) ranges from 1.19 to 1.31 indicates that all glasses are peraluminous.…”

The partitioning behavior of As and Au in S-free and S-bearing magmatic assemblages

“…EPMA oxide plus Cl totals are on the order of 94 wt% which is consistent with the expected solubility of water in the melt of approximately 5-6 wt% H 2 O. The concentration of major elements, Cl and S remains unchanged with run times from 187 to 1000 h suggesting that the melts achieve equilibrium with respect to major elements, Cl and S in less than 7 days, consistent with data from other studies (Carmichael and MacKenzie, 1963;Thompson and MacKenzie, 1967;Bailey et al, 1974;Bailey and Cooper, 1978;Baker and Rutherford, 1996;Gaillard et al, 2001;Scaillet and MacDonald, 2001;Clemente et al, 2004).…”

Magnetite solubility and iron transport in magmatic-hydrothermal environments

“…Experiments were performed for times ranging from 150 to 597 h. These experimental timescales are consistent with previous experimental studies that demonstrated equilibrium in H 2 O-saturated peralkaline assemblages (Carmichael and Mackenzie, 1963;Thompson and Mackenzie, 1967;Bailey et al, 1974;Bailey and Cooper, 1978;Scaillet and MacDonald, 2001). The goal of our experimental design was to produce equilibrated magmatic fluids that would migrate into preexisting fractures in a quartz chip before the quartz underwent self-healing.…”