Fred Gaidies

One more week to apply for a 2-yr postdoc job to work with @sumikotsuka.bsky.social (LIAG Hannover) and me @uni-jena.de to understand exhumation rates in the splendid #mountains of #Albania using #thermoluminescence #thermochronology on #carbonate #minerals in a new collaborative research program.

Hey folks!

#Geology often gets overlooked in schools

Which is crazy, because it explains why the world looks the way it does – from #mountain ranges to the ground beneath your feet

So I want to fix that! How?

By making a new educational tool for cool experiments in schools <3

Evidence for Hadean mafic intrusions in the Nuvvuagittuq Greenstone Belt, Canada Many questions remain regarding Earth’s earliest crust owing to the rarity of Hadean (>4.03 billion-year-old) rocks and minerals. The Nuvvuagittuq Greenstone Belt (NGB) in Canada may be the only known...

www.science.org/doi/10.1126/...

The Distribution of Major and Trace Elements Across a Garnet Population From the Kalak Nappe Complex (Finnmark, Scandinavian Caledonides): Evidence for Size‐Dependent Growth and Compositional Equilibration in the Garnet Zone A garnet population from the lower Kalak Nappe Complex in Finnmark (Arctic Norway) was characterized using high-resolution X-ray micro-computed tomography, electron probe micro-analysis and laser abl...

I’m happy and proud to announce the publication of @mtyogi.bsky.social new paper in JMG! It discusses the transport properties of the intergranular medium, as well as the mechanisms and kinetics of metamorphic crystallization, in rocks from Arctic Norway.

onlinelibrary.wiley.com/doi/full/10....

Join us at the University of Göttingen as a Research Assistant in Metamorphic Petrology and explore the mobilization and fractionation of REE, Th, and U during crustal melting.

📌 Find the full job posting at domsorger.eu

#metamorphicpetrology #monazite #garnet #rareearthelements #unigöttingen

Probing chemical transport through a rock using a porphyroblast population: Insights from the distributions of major, minor, and trace elements in garnet from the Danba dome (SW China) A population of garnet porphyroblasts, spaced apart between c. 6 mm and 40 mm, in a metapelite of the kyanite zone from the Danba dome was investigate…

Interested in the chemical transport properties of metamorphic rocks, particularly of its intergranular medium? Then our new paper may be something for you:

www.sciencedirect.com/science/arti...

A serpentinite mesh texture for #ThinsectionThursday. Or is it a piece of modern art? 🖌️
Note how there are several generations of serpentine, among them a clear one that filled the first fractures, and a dark one (full of magnetite) that replaced the rest of the olivine.

There are many ways to study rocks up-close! 🔬💎 These thin section drawings and images are of feldspar-pyroxene xenoliths, brought up from beneath Fagradalsfjall, Iceland, by erupted basalts🌋 #ThinSectionTuesday #Petrology

Announcing MinPlotX, an open-source software for mineral formula recalculation and compositional plotting with an easy-to-use stand-alone graphical user interface.
The open-access paper is here: lnkd.in/eB4im8dh
MinPlotX can be downloaded here: lnkd.in/eXMHtkkK
#geology #petrology #minerals

Today I was teaching binary phase diagrams with a solvus to undergrads so here is a pretty perthite with a Carlsbad twin from the hypersolvus Tolla granite (Corsica) for #ThinSectionThursday ⚒️

I also got some pretty exsolutions in a norite from the Bushveld complex #ThinSectionThursday ⚒️

A thin section photomicrograph of an andesite between crossed polars, showing white elongate feldspar phenocrysts, brightly coloured clinopyroxenes, and lots of tiny black iron oxides.

Andesite from Bad Honnef, Germany. Some lovely wee zoned feldspars along with the augites and oxides. 1893 Krantz thin section from NMS collection. #ThinSectionThursday

BSE images of a basalt clast from sample 2016Oden-D3, Alpha Ridge, Arctic Ocean, a volcanic breccia formed as the result of magma-water interaction 90 my ago. Think Kilauea lava bench deposit! Image B at yellow dot on A. #ThinSectionThursday #UNCLOS

Plate Interface Shear Zone in the Sanbagawa Metamorphic Belt, Constrained by RSCM Thermometry, U–Pb Zircon Dating and Phase Equilibria Modelling in the Sarutagawa Region, Central Shikoku, Japan Exhumed high-P/low-T complexes are of paramount importance to directly access rocks that experienced subduction zone processes. However, the original tectono-metamorphic fabrics are often partially o...

11/ If you are interested, you can find the paper in early view, accepted on JMG!

onlinelibrary.wiley.com/doi/10.1111/...

MSG RiP 2025 The Metamorphic Studies Group Research in Progress (RiP) meeting will be held in Liverpool, UK, on April 9-10th, 2025. Registration for the RiP meeting, the MAGEMin workshop (April 8th, 2024), and …

The Metamorphic Studies Group Research in Progress (RiP) meeting and related events will be held in Liverpool, UK, on April 8-11th, 2025. Registration deadline is February 20th, 2025.; see the MSG website for more.
metamorphicstudiesgroup.wordpress.com/msg-rip-2024/

Regards
John

🚨 Hot off the press 🪨 ⚒️ Where do you come from, where do you go 🎶 fluids that is… after an earthquake in the dry lower crust? We look into this and more using SEM-CL, EBSD, EMPA, STEM, and FTIR!

Hit the link below 👇

agupubs.onlinelibrary.wiley.com/doi/full/10....

Urgent Save SSU Geology

Here’s how you can help: On Monday, January 27th, we’re launching a campaign to rally support for the Geology Department. To maximize impact, we are asking you to email or call a list of influential community members (provided below). We’ve included a template letter at the bottom of this email that you can use as is, or you can personalize it with your own thoughts and experiences—whatever works best for you. The most important thing is that you send something.

Faculty and staff at Sonoma State University were just notified of the closing of the Geology Department - they are organizing an email letter writing campaign for Monday 1/27 to rally support - see below🧪⚒️

It’s awful to see the closing of another Geology department and big loss for the community.

Looking for a PhD opportunity? Interested in #experiments and #petrology? Keen to join our team at the University of Göttingen? Then apply for a 3-year position to study #microstructures and #geochemistry of #mineral reaction fronts!
Apply here:
obp.uni-goettingen.de/de-de/OBF/In...

Metamorphic rocks go on deep journeys we never can | Aeon Essays Metamorphic rocks are our emissaries from the deep, travelling to alien realms and revealing the restless nature of Earth

Our deep-time emissary, Marcia Bjornerud, takes us on a metamorphic journey.

⚒️🧪 geology GIS

Spiral garnets are beautiful... and they record deformation processes during growth. Thomas Farrell used Sm-Nd geochronology to show these garnets from Spain grew in just a few 100,000 yrs!
@agu.org #AGU24
👇Read the full paper here
pubs.geoscienceworld.org/gsa/geology/...

Interested in the transport properties and crystallization mechanisms of metamorphic rocks? @mtyogi.bsky.social will talk about it today at #AGU24 (Session V24B, room 207 A)!

Radioactive decay is difficult to envision unless you have a cloud chamber. Here I use a piece of naturally radioactive monazite crystal (~25 cm) to produce very energetic alpha particles - a decay product - that ionize alcohol-saturated vapor. I use this in Geochron and Natural Disasters classes.

Folds in a black sedimentary rock. Folds defined by white layers of quartz.

Folds in metasediments on Barred Island near Englee in Newfoundland presumably related to Taconian deformation of the Hare Bay Allochthon. #FridayFold

Gingerbread cookies decorated to represent zoned and twinned minerals.

Vegan brownie tray bake decorated in the style of a thin section, viewed under crossed-polars. Baked by petrology and volcanology research students for the annual Xmas bake off.

Volcanology- and petrology-inspired baking for the annual Oxford Earth Sciences bake-off, courtesy of Bei Bei, Rhiannon, Sofia and colleagues! ⚒️🌋🔬

Are you at #AGU24 next week and interested in the kinetics of metamorphic crystallization?

Come by and say hello to @mtyogi.bsky.social. Thereza will discuss the chemical mobility of trace elements in metamorphic rocks, as well as crystal growth mechanisms.

agu.confex.com/agu/agu24/me...

Some crystal “flowers” for #ThinSectionThursday.

These are microphotographs (PPL) of texturally sector-zoned garnets (!) from the incredible collection of Hugh Rice (Vienna).

Photograph of a rock thin section with a very regular repetitative pattern of crystal growth caused by the intergrowth of two crystals, quartz and feldspar. It resembles ancient cuneiform writing!

#thinsectionthursday #geology Graphic Granite from Brucklay Aberdeenshire @britgeosurvey.bsky.social Britrocks S29063 webapps.bgs.ac.uk/data/britroc...

Thin section microscope image showing a background of black, white, and very pale yellow plagioclase covered in a series of long worm-shaped olivine crystals, all showing bright second order birefringence colours like yellow, purple, and blue. They are all aligned down towards the right.

Probably the best individual thin section ever produced. John Faithfull's slice of the olivine cumulate from Unit 5 of the Rùm layered intrusion. #ThinSectionThursday

New paper alert! Micas and chlorite show progressive recrystallization in a retrograde shear zone, demonstrating that pressure solution is the dominant deformation mechanism (followed by grain boundary sliding). Check it out here lnkd.in/gCqMxaJB

#geology #metamorphic #rocks #minerals #science

Reminder #EGU2025: If your research involves microstructure and focuses on igneous, metamorphic, or ore geology, please consider submitting an abstract. We have great invited speakers: Dr. Rüdiger Killian (University Halle) and Dr. Marine Boulanger (Université Clermont-Auvergne). ⚒️🔬🪨