DECADE - Eruption Dynamics and Carbon Footprint of Hawaiian Hotspot Volcanoes Project uri icon

DCO ID 11121/2390-4270-4621-1793-CC

description

  • This project uses measurements of CO2, H2O, and other volatiles in deeply quenched submarine glasses and olivine-hosted melt inclusions from the five active Hawaiian volcanoes (Loihi seamount, Kilauea, Mauna Loa, Mauna Kea, and Hualalai) to determine the sources and fluxes of volatiles through the volcanic construction above the Hawaiian hotspot.  Variations in radiogenic isotopes (e.g., Pb, Sr, Nd) and magmatic volatiles (e.g., CO2, H2O, S, F, Cl) in Hawaiian volcanoes reveal a range of important processes (i.e., source heterogeneity, partial melting, crustal assimilation, magma mixing, and degassing). Hawaiian shield-stage lavas are thought to originate from partial melting of a heterogeneous source containing a mixture of peridotite and ancient oceanic crust (pyroxenite) that was recycled into the deep mantle. The source region for Hawaiian volcanoes may also be heterogeneous with respect to volatile concentrations. SIMS measurements on Hawaiian submarine glasses reveal a wide range in volatile abundances for CO2 (10-251 ppm), H2O (0.2-1.2 wt.%), S (38-2960 ppm), Cl (39-2960 ppm), and F (231-1497 ppm), and these data are being evaluated with respect to the history of magmatic output from each volcano in order to understand the sources and fluxes of volatiles over the past 2 million years of Hawaiian magmatic activity.