Partitioning of gold in young calc-alkalic volcanic rocks from Guatemala
Gold analyses of whole rock, mineral, and groundmass of seven calc-alkalic volcanic rocks (basalt to rhyolite) show that gold is less abundant in the dominant phenocrystic phases than in the whole rock; groundmass concentrations are also lower than whole rock. Crystal-liquid partition coefficients arehornblende, and about 1 for olivine, pyroxene, magnetite, and biotite. If only the principal phases are considered, the bulk gold partition coefficient is typically
The Journal of Geology
Bornhorst, Theodore J. and Rose, William I., "Partitioning of gold in young calc-alkalic volcanic rocks from Guatemala" (1986). Department of Geological and Mining Engineering and Sciences Publications. 126.