Tracking carbon from subduction to outgassing along the Aleutian-Alaska Volcanic Arc

• DOI: 10.1126/sciadv.adf3024
• Publication Date: 2023-06-28T17:57:18Z
• Authors: Taryn Lopez; Tobias P. Fischer; Terry Plank; Alberto Malinverno; Andrea L. Rizzo; Daniel J. Rasmussen; Elizabeth Cottrell; Cynthia Werner; Christoph Kern; Deborah Bergfeld; Tehnuka Ilanko; Janine L. Andrys; Katherine A. Kelley
• Keywords: Forearc; Outgassing; Adakite; Volcanic arc

Subduction transports volatiles between Earth's mantle, crust, and atmosphere, ultimately creating a habitable Earth. We use isotopes to track carbon from subduction outgassing along the Aleutian-Alaska Arc. find substantial along-strike variations in isotopic composition of volcanic gases, explained by different recycling efficiencies subducting atmosphere via arc volcanism modulated character. Fast cool facilitates ~43 61% sediment-derived organic through degassing central Aleutian volcanoes, while slow warm favors forearc sediment removal, leading ~6 9% altered oceanic crust western volcanoes. These results indicate that less is returned deep mantle than previously thought not reliable atmospheric sink over time scales.