Geochemistry and Petrology Group @ Uni. Iceland
@rockhardIES
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Tweets from the petrologists and geochemists @Haskoli_Islands. We (mostly) study the volcanic systems of Iceland, and tweet occasionally.
Reykjavik, Iceland
Joined March 2021
Preliminary report on the 2024 November eruption at Sundhnúksgígar. Magma composition is similar to previous two eruptions ⬇️ 🌋 https://t.co/3waxisJ4tb
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🌋 New paper led by @Tetraheedra on the 2021 Fagradalsfjall eruption! Check it out ⬇️
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: https://t.co/xypreO0T7L Let’s dive in to what we found: 🧵 1/
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You can read more about the new publication in @ScienceMagazine in this release of the Institute of Earth Sciences, University of Iceland https://t.co/qZZSXz4fp7
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The existence of this highly complex magma domain makes it even more difficult to predict future eruptions. See the press release and the interview to Simon Matthews, research specialist at the University of Iceland. 7/7 https://t.co/y9vmhc0Z3F
ruv.is
Hraunsýni úr fjórum eldgosum á Sundhnúksgígaröðinni eru afar ólík að gerð. Það gerir enn vandasamara að spá fyrir um næstu gos, segja vísindamenn. Þetta kemur fram í nýjasta tölublaði hins virta...
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We propose a complex and highly dynamic magma domain in the mid-crust beneath Svartsengi, where multiple magma lenses with distinct chemical compositions are stored, each contributing with a different amplitude to the eruptions. 6/7
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Our results show that the eruptions at Sundhnúksgígar derived from multiple magma lenses, which barometry place in the mid-crust. This is unusual in Icelandic eruptions, as they are commonly sourced from chemically homogenous mid-crustal reservoirs. 5/7
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We applied different barometers to estimate magma storage depths. The clinopyroxene-liquid and tephra OPAM equilibration pressures are all within mutual uncertainty and point towards pre-eruptive magma storage in the mid-crust. 4/7
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We found large geochemical variability in K2O/TiO2 (and radiogenic isotopes). The greatest variability was seen in the December and January products, while in February the range in K2O/TiO2 was much suppressed. In the March-May eruption, the variability returned. 3/7
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In the paper, we studied the eruptions at Sundhnúksgígar from December 2023 to March-May 2024. We obtained samples of lava and tephra throughout the eruptions and additional material was collected after the end of each eruption, ensuring good spatial and temporal coverage. 2/7
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🌋First release of our paper about the eruptions at Sundhnúksgígar, led by Simon Matthews, was published in Science journal🌋 https://t.co/XbgnbyqVow 1/7
science.org
Mid-crustal magma domains are the source of many basaltic eruptions. Lavas from individual eruptions are often chemically homogeneous, suggesting that they derive from single, well-mixed magma...
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Read this outreach article by @SquigglyVolcano about how we do lava sampling, sample preparation and recent volcano discoveries 🌋 Wonderful photos are included!
NEW: Iceland’s Reykjanes Peninsula has been imperilled by eruptions since 2021. Keen to unearth its secrets, scientists have been chasing the lava as it paints the land, stealing samples on the fly. How? With a bucket and shovel, of course. Me @NYTScience
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The K2O/TiO2 of the glass is 0.11-0.16, similar to the ratio measured in samples from the May-June 2024 eruption, but lower than in earlier eruptions at Sundhnúksgígar when it was 0.21-0.23. This suggests that magmas with similar compositions have accumulated since late April.
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✨Preliminary petrographic and geochemical characterization of the August eruption at Sundhnúksgígar avaiable at this link 🌋: https://t.co/HDdaADYfsL
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Sampling the north-east section of the Sundhnúksgígar lava field with @Tetraheedra, @Alberto_Carac, Sveinbjörn, Sóley and @FissureFantasy 🌋
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Sampling the 6th eruption at Sundhnúksgígar 1) lava fountaning in the northernmost part of the fissure 2) freshly fallen tephra next to a crowberry bush 3) active lava front
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New paper out, led by @Tetraheedra
I got a new paper out! A new dataset of Li isotopes on Icelandic basalt lavas. Li isotopes are affected by diffusion, so here I use Li-He isotope correlations with modeling to determine exactly how and what diffusion processes are at work. Check it out! https://t.co/AGLFFOI5F1
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The magma now erupting at Sundhnúksgígar has a K2O/TiO2 ratio resembling that of the magma which erupted in Fagradalsfjall at the beginning of the 2021 eruption. Possible connection at depth between the two volcanic systems? Data will tell 🌋 Full report⬇️ https://t.co/9DadIJbINl
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Preliminary geochemical data on the May 2024 eruption 🌋 The glass composition has a lower K2O/TiO2 ratio compared to previous Sundhnúksgígar eruptions, suggesting that a distinct magma batch, likely stored in a separate mid-crustal reservoir, is currently erupting on the surface
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🌋 Day 4 of the eruption at Sundhnúksgígar 🌋 Saturday in the field! Photos and videos taken between Sýlingarfell and Sundhnúkur! Plenty of pahoehoe flows to sample! Happy geologists 😁
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More soon on the geochemistry of the new lava. How will it compare to previously erupted lavas at Sundhnúksgígar since December 2023? Stay tuned🌋
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