Edward W. Marshall
@edmarshall.bsky.social
🌋 Geochemistry Postdoc at FAU Erlangen-Nürnberg in 🇩🇪. Studies Icelandic volcanism, magmas, and the mysteries of Earth's mantle.
Pinned
The Petrology and Geochemistry of the 2021 Fagradalsfjall Eruption, Iceland: An Eruption Sourced From Multiple, Compositionally Diverse, Near‐Moho Sills
We use high frequency sampling to observe rapid changes in lava composition during the 183 day 2021 Fagradalsfjall eruption The eruption was sourced from 12 to 15 km depth, corresponding to the l...
doi.org
My big paper on the 2021 Fagradalsfjall eruption is finally out! If you want to understand the recent eruptions on the Reykjanes Peninsula better, look no further: doi.org/10.1029/2024...
Let’s dive in to what we found: 🧵
1/8
Let’s dive in to what we found: 🧵
1/8
Reposted by Edward W. Marshall
New article just published 🤗 Find out why the Iceland rift may provide such a significant source for mantle-derived CO2! agupubs.onlinelibrary.wiley.com/doi/10.1029/...
#geochemistry
#geochemistry
Carbon Isotope and Abundance Systematics Reveal an Insignificant Crustal Sink of Mantle‐Derived CO2 in On‐Land Rift Zone Geothermal Systems
CO2 in carbonates of the Iceland crust predominantly originates from the mantle Only 1%–10% of mantle-derived CO2 that degasses along the Iceland rift zone is permanently fixed into carbonates C...
agupubs.onlinelibrary.wiley.com
October 3, 2025 at 2:37 PM
New article just published 🤗 Find out why the Iceland rift may provide such a significant source for mantle-derived CO2! agupubs.onlinelibrary.wiley.com/doi/10.1029/...
#geochemistry
#geochemistry
Reposted by Edward W. Marshall
New publication out on the interaction of seawater with oceanic crust! 🌊 🪨 We show how temperature, reaction progress, time and crystallinity of the crust affect elemental fluxes! www.sciencedirect.com/science/arti...
Modeling seawater-basalt interaction at 10–100 °C: Controlling parameters and effects on the composition of the oceanic crust and seawater
Chemical reactions and element mobilization during seawater-basalt interaction play a central role in regulating global element fluxes between seawate…
www.sciencedirect.com
September 27, 2025 at 2:25 PM
New publication out on the interaction of seawater with oceanic crust! 🌊 🪨 We show how temperature, reaction progress, time and crystallinity of the crust affect elemental fluxes! www.sciencedirect.com/science/arti...
Reposted by Edward W. Marshall
Happy to share the long-awaited results of our community experiment comparing high-precision ID-TIMS U-Pb lab performance🧪⚒️
We do pretty well but as ever there is room for improvement 🤓 Stay tuned!
doi.org/10.5194/gchr...
We do pretty well but as ever there is room for improvement 🤓 Stay tuned!
doi.org/10.5194/gchr...
Interlaboratory reproducibility of ID-TIMS U–Pb geochronology evaluated with a pre-spiked natural zircon solution
Abstract. The highest precision and accuracy in U–Pb geochronology is achieved using isotope dilution thermal ionisation mass spectrometry (ID-TIMS), a technique which owes its reliability to precise ...
doi.org
September 4, 2025 at 4:08 PM
Happy to share the long-awaited results of our community experiment comparing high-precision ID-TIMS U-Pb lab performance🧪⚒️
We do pretty well but as ever there is room for improvement 🤓 Stay tuned!
doi.org/10.5194/gchr...
We do pretty well but as ever there is room for improvement 🤓 Stay tuned!
doi.org/10.5194/gchr...
Reposted by Edward W. Marshall
The typeset version of the 2022-2023 Fagradalsfjall paper is out, so let’s go over the main points of the paper 🌋
Mush Disaggregation and Dike Propagation Timescales at Active Volcanoes: Evidence from the 2022–2023 Fagradalsfjall Eruptions
Abstract. The architectures of magma plumbing systems and timescales of magmatic processes are fundamental to understanding volcanic eruption dynamics. Thi
academic.oup.com
June 18, 2025 at 10:16 AM
The typeset version of the 2022-2023 Fagradalsfjall paper is out, so let’s go over the main points of the paper 🌋
Reposted by Edward W. Marshall
Interested in crystal mushes? New review paper just out: rdcu.be/eo9pC
Great to be part of the team!
Great to be part of the team!
Crystal mush processes and crustal magmatism
Nature Reviews Earth & Environment - Crystal mush processes are key to magmatic differentiation, volcanic system behaviour and some mineral resources. This Review discusses the processes...
rdcu.be
June 5, 2025 at 11:45 AM
Interested in crystal mushes? New review paper just out: rdcu.be/eo9pC
Great to be part of the team!
Great to be part of the team!
Amazing work by @albertocaracciolo.bsky.social . It's the coolest diffusion timescale work I've ever seen. You can see each eruption priming and how they are related to one another. Just super cool science.
🚨🌋New paper on the geochemistry and petrology of the 2022–23 Fagradalsfjall eruptions on the Reykjanes Peninsula, Iceland. We study temporal variations in the magmatic plumbing system and link diffusion timescales to monitoring signals, tracing the timing of mush disaggregation and dike propagation
Mush disaggregation and dike propagation timescales at active volcanoes – Evidence from the 2022-2023 Fagradalsfjall eruptions
Abstract. The architectures of magma plumbing systems and timescales of magmatic processes are fundamental to understanding volcanic eruption dynamics. Thi
academic.oup.com
June 3, 2025 at 8:31 AM
Amazing work by @albertocaracciolo.bsky.social . It's the coolest diffusion timescale work I've ever seen. You can see each eruption priming and how they are related to one another. Just super cool science.
Reposted by Edward W. Marshall
🚨🌋New paper on the geochemistry and petrology of the 2022–23 Fagradalsfjall eruptions on the Reykjanes Peninsula, Iceland. We study temporal variations in the magmatic plumbing system and link diffusion timescales to monitoring signals, tracing the timing of mush disaggregation and dike propagation
Mush disaggregation and dike propagation timescales at active volcanoes – Evidence from the 2022-2023 Fagradalsfjall eruptions
Abstract. The architectures of magma plumbing systems and timescales of magmatic processes are fundamental to understanding volcanic eruption dynamics. Thi
academic.oup.com
June 3, 2025 at 8:23 AM
🚨🌋New paper on the geochemistry and petrology of the 2022–23 Fagradalsfjall eruptions on the Reykjanes Peninsula, Iceland. We study temporal variations in the magmatic plumbing system and link diffusion timescales to monitoring signals, tracing the timing of mush disaggregation and dike propagation
Reposted by Edward W. Marshall
This proposed budget is a policy statement, not an appropriation.
There are still a lot of steps and potential changes ahead before it becomes one. This is not a time to sit quietly, team. Let's go.
There are still a lot of steps and potential changes ahead before it becomes one. This is not a time to sit quietly, team. Let's go.
May 31, 2025 at 1:38 PM
This proposed budget is a policy statement, not an appropriation.
There are still a lot of steps and potential changes ahead before it becomes one. This is not a time to sit quietly, team. Let's go.
There are still a lot of steps and potential changes ahead before it becomes one. This is not a time to sit quietly, team. Let's go.
This was written about media content, but the same can be said for scientific content. When the incentive structure is based around numbers of papers and numbers of citations, it's a system that assumes quantity means quality. It's ripe for abuse by AI, which can do quantity really well...
“It's so emblematic of the moment we're in, the Who Cares Era, where completely disposable things are shoddily produced for people to mostly ignore.” dansinker.com/posts/2025-0...
When the most radical thing you can do is care. H/t @chemjobber.bsky.social
When the most radical thing you can do is care. H/t @chemjobber.bsky.social
The Who Cares Era | dansinker.com
dansinker.com
May 29, 2025 at 6:38 AM
This was written about media content, but the same can be said for scientific content. When the incentive structure is based around numbers of papers and numbers of citations, it's a system that assumes quantity means quality. It's ripe for abuse by AI, which can do quantity really well...
Reposted by Edward W. Marshall
New paper out by my team, led originally by the late Jasper Konter, an amazing human being and scientist, and with important contributions from the late Paul Wessel, both of whom we lost during review.
The whole team stepped up to get this paper to the finish line.
www.nature.com/articles/s41...
The whole team stepped up to get this paper to the finish line.
www.nature.com/articles/s41...
Pacific hotspots reveal a Louisville–Ontong Java Nui tectonic link - Nature
Geochemistry and geochronology show that Samoa and Rurutu–Arago are the longest-lived Pacific hotspots, providing better constraints on plate rotation and support for a link between the Louisville vol...
www.nature.com
April 30, 2025 at 3:43 PM
New paper out by my team, led originally by the late Jasper Konter, an amazing human being and scientist, and with important contributions from the late Paul Wessel, both of whom we lost during review.
The whole team stepped up to get this paper to the finish line.
www.nature.com/articles/s41...
The whole team stepped up to get this paper to the finish line.
www.nature.com/articles/s41...
Reposted by Edward W. Marshall
Former Columbia provost Jonathan Cole-"Columbia’s leaders have weakened...our leadership among the greatest educational institutions in the world...If we don’t resist collectively by all legal means...we are apt to see the destruction of our most revered institutions” www.nytimes.com/2025/03/24/o...
Opinion | Universities Gave Us the iPhone, the Jet Engine and Gatorade. We’re Tossing That Away.
The postwar compact on research that powered America’s economic and military dominance is under threat.
www.nytimes.com
March 24, 2025 at 10:30 AM
Former Columbia provost Jonathan Cole-"Columbia’s leaders have weakened...our leadership among the greatest educational institutions in the world...If we don’t resist collectively by all legal means...we are apt to see the destruction of our most revered institutions” www.nytimes.com/2025/03/24/o...
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!
March 13, 2025 at 6:28 PM
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!
Reposted by Edward W. Marshall
Paper out! This is one of the main and last outcomes of the IS-TREMOR project supported by the Iceland Research Fund. Shoutout to Jean for leading this work!
@seismotom.bsky.social
@cocaudron.bsky.social
@seismotom.bsky.social
@cocaudron.bsky.social
Dynamics of the 2021 Fagradalsfjall Eruption (Iceland) Revealed by Volcanic Tremor Patterns
Seismic network-based analysis enables to measure spatial, temporal and spectral properties of distinct tremor patterns during the eruption Minute-long tremor bursts associated with pulsating lav...
doi.org
February 28, 2025 at 8:04 PM
Paper out! This is one of the main and last outcomes of the IS-TREMOR project supported by the Iceland Research Fund. Shoutout to Jean for leading this work!
@seismotom.bsky.social
@cocaudron.bsky.social
@seismotom.bsky.social
@cocaudron.bsky.social
Are a geoscience student in the US thinking about a PhD, but feeling pessimistic about the future of US science? Come to Europe!
We have 18 fully funded (and unfilled) PhD positions-- all related to fluid related processes within the Earth.
Find out more & apply: formovfluid.eu/phd-positions/
We have 18 fully funded (and unfilled) PhD positions-- all related to fluid related processes within the Earth.
Find out more & apply: formovfluid.eu/phd-positions/
FormovFluid
formovfluid.eu
February 27, 2025 at 5:11 PM
Are a geoscience student in the US thinking about a PhD, but feeling pessimistic about the future of US science? Come to Europe!
We have 18 fully funded (and unfilled) PhD positions-- all related to fluid related processes within the Earth.
Find out more & apply: formovfluid.eu/phd-positions/
We have 18 fully funded (and unfilled) PhD positions-- all related to fluid related processes within the Earth.
Find out more & apply: formovfluid.eu/phd-positions/
Reposted by Edward W. Marshall
⚒️🧪 Today's Icelandic Met Office update says that the likelihood of another eruption increases as more time passes, since magma is still accumulating below.
There's also a neat detailed map of the eruption start points and fissures from all 7 Sundhnúksgígar eruptions so far.
vedur.is/um-vi/fretti...
There's also a neat detailed map of the eruption start points and fissures from all 7 Sundhnúksgígar eruptions so far.
vedur.is/um-vi/fretti...
February 22, 2025 at 5:49 AM
⚒️🧪 Today's Icelandic Met Office update says that the likelihood of another eruption increases as more time passes, since magma is still accumulating below.
There's also a neat detailed map of the eruption start points and fissures from all 7 Sundhnúksgígar eruptions so far.
vedur.is/um-vi/fretti...
There's also a neat detailed map of the eruption start points and fissures from all 7 Sundhnúksgígar eruptions so far.
vedur.is/um-vi/fretti...
Woohoo! The website is up! I had good fun coming up with the lab motto- "mente et ardore". It's a take on the classic geology motto "mente et malleo" which means "by reason and hammer", but since it's a laser lab...
Our Laser Ablation tandem quadrupole ICP-MS facility is finally up and running!
Find out more about the types of analyses that we carry out:
www.gzn.nat.fau.eu/geochemistry...
Find out more about the types of analyses that we carry out:
www.gzn.nat.fau.eu/geochemistry...
Laboratory equipment
~ Mente et Ardore ~ Our laboratory is based around a 193 nm Excimer laser ablation unit (Teledyne Analyte Excite) coupled to a new, and state-of-the-art, 8900 Agilent Triple-Quadrupole ICP-MS (LA-ICP…
www.gzn.nat.fau.eu
February 5, 2025 at 9:02 PM
Woohoo! The website is up! I had good fun coming up with the lab motto- "mente et ardore". It's a take on the classic geology motto "mente et malleo" which means "by reason and hammer", but since it's a laser lab...
Reposted by Edward W. Marshall
GNS Science is hiring!
We are looking for someone to join our team as an InSAR Scientist (17 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
Or as a Senior Environmental Geochemist (24 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
We are looking for someone to join our team as an InSAR Scientist (17 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
Or as a Senior Environmental Geochemist (24 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
February 3, 2025 at 9:53 PM
GNS Science is hiring!
We are looking for someone to join our team as an InSAR Scientist (17 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
Or as a Senior Environmental Geochemist (24 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
We are looking for someone to join our team as an InSAR Scientist (17 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
Or as a Senior Environmental Geochemist (24 Feb. deadline): nzcris.wd3.myworkdayjobs.com/en-US/nzcris...
Reposted by Edward W. Marshall
SARUMAN: Lands a tenured position while still finishing his PhD
GANDALF: Trail of post-docs and teaching posts. People never sure what his institutional affiliation is. Drops in 'yeah that was when I was in Rhûn for 90 years'
RADAGAST: Lives by proofreading and eating the dandelions in his garden
GANDALF: Trail of post-docs and teaching posts. People never sure what his institutional affiliation is. Drops in 'yeah that was when I was in Rhûn for 90 years'
RADAGAST: Lives by proofreading and eating the dandelions in his garden
Academics love Lord of the Rings because it's about a researcher (Gandalf) who does their dissertation on an obscure topic (Hobbit lore), wanders around doing post-docs, gets destroyed in the question session from hell but triumphantly returns and gets to take the golden-boy prof (Saruman)'s job
January 28, 2025 at 8:46 AM
SARUMAN: Lands a tenured position while still finishing his PhD
GANDALF: Trail of post-docs and teaching posts. People never sure what his institutional affiliation is. Drops in 'yeah that was when I was in Rhûn for 90 years'
RADAGAST: Lives by proofreading and eating the dandelions in his garden
GANDALF: Trail of post-docs and teaching posts. People never sure what his institutional affiliation is. Drops in 'yeah that was when I was in Rhûn for 90 years'
RADAGAST: Lives by proofreading and eating the dandelions in his garden
Reposted by Edward W. Marshall
A very interesting paper by Keeley in 2021 Science Advances. They analyzed all Santa Ana Wind (SAW) events and associated fires in Southern California between 1950s and 2020. www.science.org/doi/10.1126/...
Ignitions explain more than temperature or precipitation in driving Santa Ana wind fires
Temperature and precipitation play less of a role in predicting area burned compared to wind speed and number of ignitions.
www.science.org
January 10, 2025 at 10:37 PM
A very interesting paper by Keeley in 2021 Science Advances. They analyzed all Santa Ana Wind (SAW) events and associated fires in Southern California between 1950s and 2020. www.science.org/doi/10.1126/...
My recent article on the 2021 Fagradalsfjall eruption got a highlight in Eos! Cool! eos.org/editor-highl...
Magma Diversity in Iceland - Eos
Iceland’s recent basalt eruptions originated at the crust-mantle boundary and show chemical variability over remarkably short timescales of weeks, suggesting exchanges between diverse magma sources.
eos.org
January 5, 2025 at 4:27 PM
My recent article on the 2021 Fagradalsfjall eruption got a highlight in Eos! Cool! eos.org/editor-highl...
Reposted by Edward W. Marshall
Axial seamount, off the Oregon coast, is getting ready to erupt (again) in 2025. The most well instrumented under sea volcano has reached similar inflation as when it erupted (as predicted at that time) in 2015. Real time data is online for anyone to see! ⚒️🧪🌋
www.sciencenews.org/article/scie...
www.sciencenews.org/article/scie...
December 28, 2024 at 3:44 PM
Axial seamount, off the Oregon coast, is getting ready to erupt (again) in 2025. The most well instrumented under sea volcano has reached similar inflation as when it erupted (as predicted at that time) in 2015. Real time data is online for anyone to see! ⚒️🧪🌋
www.sciencenews.org/article/scie...
www.sciencenews.org/article/scie...
Reposted by Edward W. Marshall
So how small are the zircons that we date in the lab? Here's a Fish Canyon Tuff zircon on a $5 bill for comparison!
December 13, 2024 at 6:25 PM
So how small are the zircons that we date in the lab? Here's a Fish Canyon Tuff zircon on a $5 bill for comparison!
Reposted by Edward W. Marshall
Preliminary geochemical report on the November 2024 eruption at Sundhnúksgígar. Similar magma composition to the two previous eruptions 🌋
Eruption at Sundhnúksgígar, November 2024 – preliminary petrographic and geochemical results | Institute of Earth Sciences
earthice.hi.is
November 30, 2024 at 10:57 AM
Preliminary geochemical report on the November 2024 eruption at Sundhnúksgígar. Similar magma composition to the two previous eruptions 🌋