Tracing Volatiles, Halogens, and Chalcophile Metals During Melt Evolution at the Tolbachik Monogenetic Field, Kamchatka [dataset] ...

• Main Author: Iveson, Alexander
• Format: Dataset
• Language: unknown
• Published: Durham University 2022
• Subjects: Geology; FOS Earth and related environmental sciences; Geochemistry; Volcanology; Halogen; Chalcophile metal; Melt inclusion; SIMS; EPMA; LA-ICP-MS; Tolbachik; Kamchatka
• Online Access: https://dx.doi.org/10.15128/r1s4655g62f; http://collections.durham.ac.uk/files/r1s4655g62f

Melt storage and supply beneath arc volcanoes may be distributed between a central stratovolcano and wider fields of monogenetic cones, indicating complex shallow plumbing systems. However, the impact of such spatially variable magma storage conditions on volatile degassing and trace element geochemistry is unclear. This study explores magma generation and storage processes beneath the Tolbachik volcanic field, Kamchatka, Russia, in order to investigate the evolution of the magmatic volatile phase and, specifically, the strong enrichment of chalcophile metals (specifically, Cu) in this system. We present new geochemical data for a large suite of olivine- and clinopyroxene-hosted melt inclusions (and host phenocrysts) from five separate monogenetic cones within the Tolbachik volcanic field. These high-Al composition magmas likely reflect the homogenised fractionation products of primitive intermediate-Mg melt compositions, stored at shallow depths after significant fractional crystallisation. Boron isotope ...