The partitioning of Sc, Y, and the rare earth elements between high-Ca pyroxene and natural mafic to intermediate lavas at 1 atmosphere

摘要: The effects of composition and temperature on the partitioning behavior Sc, Y, rare earth elements (REEs) between high-Ca clinopyroxene natural silicate melts were evaluated from doped experiments mafic to intermediate lavas at 1 atmosphere pressure. Partition coefficients for these found be dependent composition. most important compositional parameters controlling clinopyroxene-melt REEs are Al content liquid pyroxene Ca content. Towards goal deriving expressions describing behavior, approximations made equilibrium constants reactions involving a REE-Al component in pyroxene. Regression over experimental range (1180-1050°C) produced which, when applied glasses, reproduced trace element contents with precisions 9 32% (1σ). conclusion this work is that pyroxene-melt partition trivalent cations have different dependencies than divalent because participation paired substitution. Values REE factor two alkali basalts, andesites, tholeiitic basalts (e.g., 0.2-0.7 Sm 1100°C). This represents large proportion total D values all magmas. Our contribution describe control behavior. will allow us more accurately determine specific systems.