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Edward W. Marshall

@edmarshall.bsky.social

🌋 Geochemistry Postdoc at FAU Erlangen-Nürnberg in 🇩🇪. Studies Icelandic volcanism, magmas, and the mysteries of Earth's mantle.

Posts Replies Media

Edward W. Marshall @edmarshall.bsky.social · 13/03/2025

Phew--- looks like the earthquake swarm at the tip of the Reykjanes sputtered out. An eruption there would come straight through the geothermal field and power plant there, so it would be devastating! Although magma injection is probably good for the longevity of the geothermal reservoir!

An earthquake map of the Reykjanes peninsula. A bar on the bottom shows earthquakes over time. The earthquake swarm suddenly stopped about 5 hours ago.

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Edward W. Marshall @edmarshall.bsky.social · 13/12/2024

Looks like interplanetary controls 😂

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Edward W. Marshall @edmarshall.bsky.social · 28/11/2024

In all, the image that our work puts together is that the base of the crust on the Reykjanes Peninsula is a really exciting place right now. Lots of magma on the move, and a volcanic system in the process of “reawakening”. 7/8

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Edward W. Marshall @edmarshall.bsky.social · 28/11/2024

The trace element and isotope composition of the later 2021 Fagradalsfjall lavas are like unlike anything known to have erupted in Iceland before. The lava lie entirely off the compositional “Iceland array”. These lavas have the lowest 143Nd/144Nd of any Icelandic rift basalt! 4/8

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Edward W. Marshall @edmarshall.bsky.social · 28/11/2024

We can use the compositions of the minerals and the lava to calculate what depth the eruption is sourced from. We find that the eruption is sourced from close to the crust-mantle boundary- the place where melts ascending from the mantle “meet up” to make big magma bodies. 3/8

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Edward W. Marshall @edmarshall.bsky.social · 28/11/2024

We find that erupted lava compositions change rapidly, with large geochemical changes occurring even between two trips to the eruption. By “large” I mean larger than all mantle geochemical variability observed in the entire previous cycle of eruptions on the Reykjanes. 2/8

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Edward W. Marshall @edmarshall.bsky.social · 17/11/2024

Post a picture you took (no description) to bring some zen to the timeline.

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Edward W. Marshall @edmarshall.bsky.social · 10/11/2023

An eruption might be brewing on the Reykjanes. There's been a sill inflating for the past weeks, and it may have finally reached a tipping point and made a dike. Well see if the dike makes it to the surface, but hopefully not!

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