Petrology and geochemistry of the 2014–2015 Holuhraun eruption, central Iceland: compositional and mineralogical characteristics, temporal variability and magma storage

A Data Driven Approach to Investigate the Chemical Variability of Clinopyroxenes From the 2014–2015 Holuhraun–Bárdarbunga Eruption (Iceland)

“…Plagioclase is also included in cpx but is not generally closer to the core than the innermost resorption zone (Figure 2a). Plotting the analyses in Harker diagrams with gray-scale reflecting the month of eruption of the sample, show no chemical trends of the cpx with time (Figure 3), which is consistent with previous observations (Halldórsson et al, 2018). Additionally, the variation of chemistry from the core to the rim of single cpx can span the entire range of chemical variability observed throughout the eruption.…”

“…This eruption was intensely monitored, which makes it an excellent case study to attempt to relate monitoring signals and the chemistry of the erupted products. Petrologic investigations find that the source of magmas might be heterogeneous, but homogenization processes within the magma reservoir masked both source heterogeneity and any potential evolution of magma chemistry during the eruption (Halldórsson et al, 2018;Hartley et al, 2018).…”

“…Several previous studies suggest that magma and melt inclusion composition is broadly constant over the course of the eruption (Browning and Gudmundsson, 2015;Gauthier et al, 2016;Geiger et al, 2016;Ruch et al, 2016;Ilyinskaya et al, 2017;Bali et al, 2018;Halldórsson et al, 2018;Hartley et al, 2018;Woods et al, 2019). We focused our analysis on clinopyroxene (cpx), which are characterized by different patterns of sector and concentric oscillatory zoning.…”

Melt movement through the Icelandic crust

“…A new application of the OPAM parametrization by Hartley et al [61] found that the Holuhraun melt was stored at 2.1 ± 0.7 kbar, equivalent to a depth of about 7.5 km below the surface. Another barometer, which relies upon the exchange of sodium between clinopyroxene and liquid, was also applied to the products of this eruption [63,64] and found that the clinopyroxenes equilibrated with the carrier liquid at the same pressure of 2.1 ± 1.5 kbar. The close correspondence in pressures between the two barometers indicates strongly that the final depth of storage and equilibration of the Holuhraun magma was close to 7.5 km depth (approx.…”

Integrated Petrological and Geophysical Constraints on Magma System Architecture in the Western Galápagos Archipelago: Insights From Wolf Volcano

“…Geophysical and petrological constraints are not often combined to study the architecture of subvolcanic systems, largely because both data sets are seldom simultaneously available for the same eruptions (Jay et al, 2014). In the rare circumstance where both robust geophysical data sets and rock samples are available, integration can provide better constraints on magma storage depths, additional information about the structure and dynamics of magma plumbing systems, and an improved understanding of the processes responsible for pre-eruptive monitoring signals (Gudmundsson et al, 2016;Halldórsson et al, 2018;Hartley et al, 2018;Jay et al, 2014;Klügel et al, 2015;Laeger et al, 2017;Longpré et al, 2014;Magee et al, 2018;Stock et al, 2018).…”