Phys.org July 23, 2024
Vanadium and scandium levels of arc magma served as key indicators in the geochemical models. By compiling global geochemical data from Cenozoic arc magma and olivine-hosted melt inclusions, researchers at the University of Arizona found a latitude-dependent redox distribution of arc magma with less oxidized magma in lower latitudes compared to those in higher latitudes. Based on their work the researchers proposed that such a latitude-dependent pattern in the arc mantle may be controlled by the variation in the redox state of subducted sediment, possibly related to a latitudinal variation in the primary production of phytoplankton, which results in more organic carbon and sulfide deposited on the low-latitude ocean floor. The researchers concluded that their findings provide evidence for the impact of the surface environment on Earth’s upper mantle… read more. Open Access TECHNICAL ARTICLE
Distribution of ΔFMQ of olivine-hosted melt inclusions and V/Sc ratios… Credit: Nature Communications volume 15, Article number: 6050 (2024)