Thin Section Thursday! A fractured olivine (~3 mm) in basalt. It shows undulatory extinction suggestive of plastic deformation, implying that the grain is a xenocryst entrained from surrounding peridotites. Thanks @tectonic_city. #thinsectionthursday #olivine @tectonic_city @officialcsusbgeology

I always knew in theory that a speleothem is a sedimentary rock, but I've never seen a cross-bedded stalactite before 😂

🚨 Thu 17 July: webinar at 12 noon CEST! 🚨Join Lotta Ternieten for her journey to groundbreaking findings on the early transformation of iron released from hydrothermal vents at the Mid-Atlantic Ridge. 🌊⚙️ 👉 Register and find out how we can help you! — events.teams.microsoft.com/event/893d39...

Really happy with this paper with my buddies Tom & Carl. Started with online discussions during Covid lockdowns and is now published in Tectonics: "Lithospheric Unzipping Explaining Hot Orogenesis During Continental Subduction" agupubs.onlinelibrary.wiley.com/doi/epdf/10....

Exciting news! Our new paper, "Carbonation and deformation of oceanic serpentinites in the Elba subduction channel: Evidence for fluid-rock interaction at seismogenic depth," is now #OpenAccess in Earth and Planetary Scientific Letters! ⚒️ authors.elsevier.com/sd/article/S...

Our latest research is hot off the press! ⚒️ We've captured amazing footage of #Hydrogen gas moving through #Rock in real-time - think of it like making a movie of something that normally happens deep underground where no one can see it. Article link: doi.org/10.1016/j.jc...

Bit of an unusual #ThinSectionThursday Over the past weeks, I've been busy collecting data with the Triboindenter, performing deformation experiments on grains in thin sections. See below a topography 3D model of one of these indents (looks like a crater), also collected with the indenter.

Amidst all terrible news, I am sad that here it is not better. Today the VU Amsterdam announced they'll cut Earth Sciences, and fire 39 staff. 130 students are left to figure out how to finish, and an unknown number of PhDs lose their supervisors. My heart goes out to my colleagues 😳😥

Europa heeft geologen en milieuwetenschappers nodig, terwijl Nederland juist daarin snijdt. Op dit moment wordt 3% van de 'Critical Raw Materials' die Europa nodig heeft, hier gewonnen. De EU wil dat in de komende vijf jaar verdrievoudigen, en wel volgens Europese standaarden. Dat vergt kennis 1/n

Check out Stephen (et al.)'s latest paper!

A beautiful example of an Outer Hebrides dyke cutting the foliation in Archaean #Lewisian gneiss. Although folded by later Laxfordian deformation both the dyke and a thin apophysis exhibit near perpendicular angular discordance in the fold hinge, becoming concordant in the limbs. Isle of Harris. ⚒️🧪

My OH is a keen walker and getting quite good at photographing interesting geological locations. This has gone to the top of my Spring excursion list. Pink #Laxfordian granitic intrusions invading #Lewisian gneisses and amphibolites. Mangersta, #IsleofLewis ⚒️🧪

I am reaching out to the #geoscience community - I need help. My MSc thesis was curtailed due to being unable to even access the building @ my previous university♿️ they provided no alternative. They’ve taken no responsibility for this #discrimination after I submitted an appeal.

Pyroxene with exsolution lamellae in a gabbro from Susa, Yamaguchi, Japan.

Also metamorphic rocks can have really cool Fe-Ti oxides! I found this cluster with intergrowths of Ti-magnetite and Mn-ilmenite (white & grey lines resp.), and rutile with non-Mn-ilmenite exsolution (grey & white lines resp.), in garnetite from Lago di Cignana.

Watch these snowflake-like dendritic clinopyroxenes twinkle as this thin section is rotated in cross-polarised light!❄️☃️ This is a rare volcanic rock called komatiite, from Gorgona. Credit: Charlie Gordon. #ThinSectionTuesday #Petrology #Mineralogy

Today is my first day as postdoc at Utrecht University! For the next three years, I will be focusing on the mechanical behaviour of minerals in various settings using nanoindentation, as part of EPOS-eNLarge and working with Dr Alissa Kotowski. Excited to get started!

📣open PhD Position📣 We’re looking for a PhD student to experimentally investigate the role of aqueous fluids in the transfer of carbon in subduction zones at @unimuenster.bsky.social🇩🇪 in collaboration with the University of Perugia🇮🇹. More info here stellen.uni-muenster.de/jobposting/7...

I'm considering giving these historic books away. Saved them from being thrown away. Maybe there's an institute, library or individual here who could use them... ⚒️ 🧪 #Geology @ingvterremoti.bsky.social

Today: geology meets archaeology! This is what we call a "hunebed" in Dutch: a neolithic burial structure built by people of the Funnelbeaker culture between ~3400-3000 BC. Many are found across the northern Netherlands and parts of Germany and Denmark. But what are they made of?

So strong and yet so weak: Look at this beautiful 'weak' shear zone in a 'strong' gabbro from western Norway. Can't wait to get back to the field in the summer! 🧪⚒️

Are you interested in how deformation and metamorphism interact? Consider submitting an abstract to our session at #EGU25 ⚒️🧪 meetingorganizer.copernicus.org/EGU25/sessio... Deadline to apply for travel support is om the 2nd of december!

Today my time in Norway sadly comes to an end. It has been an incredible time and I'm deeply grateful to all my friends and coworkers at The Njord Centre. Soon: the start of my next adventure, and papers about my work at the university of Oslo!

I woke up to a bunch of new followers, so I should share some things that we do here at the Njord Centre, University of Oslo. Here is my JGR: Solid Earth paper on porosity in lower crustal faults and ductile shear zones using microCT, EBSD, SEM-CL. agupubs.onlinelibrary.wiley.com/doi/abs/10.1...

Felt like sharing a picture of one of my favourite rocks. It's a vein of quartz, kyanite, and phengite, hosted in a matrix of graphitic garnet schist.

It's the season for gorgeous sunsets. Wavy orange clouds over Oslo and the fjord, seen from the physics building of the university of Oslo

It's the Mineral Cup final and kyanite needs your vote! This blue mineral is visually stunning and really interesting from a scientific point of view. #MinCup24 #Kyanite

I've been quietly participating in Mineral Cup so far but now that corundum is in danger, it's time to bring out the big guns. See here, the most beautiful rock on earth. With corundum. Unfortunately I do not know the source of the picture or the rock. Vote corundum!

Hello - I am new here. Geology professor with diverse interests pcwww.liv.ac.uk/johnwh/Websi...

A guided tour (courtesy of Jack Whattam, UiO) of Oslo’s Nordmarka and hundreds of millions of years of its fiery past! 🌋 … and a nice opportunity to meet @hugolantman.bsky.social in person!

🧵 Shortlist of Geosciences starter packs🧵 Share and let us benefit from the current growth to bring people (back) to @bsky.app. 🧪⚒️🌋🌍 💎🦖🪐🌊 Geosciences all topics go.bsky.app/VFn34zW Seismology go.bsky.app/ND4oS9k Paleontology by @alinemghilardi.bsky.social go.bsky.app/QWhLarC

Was leafing through some old pictures and feeling the need to share this one - it's a small outcrop from Southern Spain, basaltic-gabbroic rocks that have been metamorphosed. You can see the strong effect that the composition and texture of the initial rock has on the metamorphic product.

Having a great time in the Bergen Arcs with these absolute petrological and structural wonders

Bluesky needs some more cool geo images, so here's some orthopyroxene from a serpentinized peridotite (Semail ophiolite, Oman), seen with cross-polarised light in the optical microscope. The coloured patches seem to be exsolution features.

A beautifully exposed normal fault, featuring prof Luca Menegon pointing at the latest active fault plane

How is Norway so gorgeous?

The most beautiful outcrop in the world! Beginning asymmetric boudinage and veins provide evidence of consistent kinematics during protracted deformation of the Nordfjord-Sogn detachment. #geology

It's an eclogite kind of day

Day 2 of the tectonics field tip took us through the basement of Baltica and to the Nordfjord-Sogn detachment! #geology @hugolantman.bsky.social @glgysteve.bsky.social

Shear sense indicators doing their thing

Time for the Tectonics field trip with UiO to the western Gneiss region. Day 1:migmatite, flame structures, tillite and an excellent view

Time for the Tectonics field trip with UiO to the western Gneiss region. Day 1:migmatite, flame structures, tillite and an excellent view

Day 1 of this years tectonics field trip: The pictures show flame structures in a turbidite sequence, providing nice way-up criteria, and axial cleavage-bedding intersections from folding of the sequence. #geology

See you all in Vienna! #egu24

We have an age! Check out our latest paper on dating lower-crustal earthquakes! We combined apatite U-Pb data with microstructural observations (EBSD, CL). Open access! @MicroLuca @NjordUiO authors.elsevier.com/sd/article/S...

One of my favourite office rocks: a "fossil" earthquake! Pseudotachylyte (dark glassy veins formed from quenching of a frictional melt) with clasts, in a monzonite from Northern Norway.

#EGU24 deadline is approaching! Please consider contributing to our session if you are working on interactions between brittle deformation, ductile deformation, and/or metamorphism. meetingorganizer.copernicus.org/EGU24/sessio...

Nature just treated Oslo to some stunning nacreous / polar stratospheric clouds!

Interesting but inconsequential for my work: iron sulfide (pyrrhotite?) that partially transformed to iron oxide (hematite?) in a clast within a pseudotachylite. Seems that the sulfur did not make it far: there are plenty of sulfide droplets in the pseudotachylite and along cracks.⚒️

Are you working on brittle and/or ductile deformation, possibly associated with metamorphic reactions? We would love to hear about it! Consider submitting to our session at #EGU24 meetingorganizer.copernicus.org/EGU24/sessio...