Volcanically extruded phosphides as an abiotic source of Venusian phosphine

Published observations suggest small amounts of phosphine in the atmosphere of Venus, and various abiotic mechanisms for its generation have been rejected in the literature, including active volcanism. We reexamine a volcanic source and find it to be sufficient to supply the observed amount of phosphine given that Venus might be subject to episodes of active volcanism and magmas originating deep in the mantle and brought up by plume volcanism.