Latest posts tagged with #Metamorphism on Bluesky
Geochemical, O-H-Sr Isotopic, and Thermodynamic Insights into the Metasomatic and Metamorphic Evolution of the Saxothuringian Crust: The Case of the Kowadło Ultramafic Suite (SW Poland) #PolandGeology #Geochemistry #IsotopeGeochemistry #Metamorphism #Metasomatism #Petrology
Kailua Member of the Koʻolau Basalt
Secondary minerals including opal, cristobalite, and epidotized plagioclase glomerocrysts
#geology #geoscience #hawaii #metamorphism #epidote #plagioclase #quartz #Basalt #opal
Large and deformed garnet grains in thin section
Sheared, fractured, and dissected garnet grains. Oil on canvas 😍
#geology #garnet #metamorphism #minerals #rocks
Our updated 54" x 36" Geology of Plate Tectonics chart reflects recent advances in geological thought over the past 40 years. Grab one below!
English (folded): geosociety.co/3KO5SNe
Spanish (folded): geosociety.co/3ML4Guy
#PlateTectonics #Tectonics #Volcanism #Metamorphism #Seismicity #Geothermal
Retrograde eclogite imprinted with blueschist facies minerals including phengite (golden flakey mineral), actinolite (black needles), and glaucophane (blue).
Franciscan Complex, California
#eclogite #blueschist #metamorphism #geology #geoscience #glaucophane #mica #amphibole
Lots of Laumontite (zeolite) crystals precipitated in vesicles from circulating hydrothermal fluids in the Koʻolau Caldera (Kailua Member 9fnthe Koʻolau Basalt)
Widespread Laumontite precipitated in vesicles of the Kailua Member of the Koʻolau Basalt indicate circulating hydrothermal fluids here were around 300° C (Zeolite Facies).
Kailua, Koʻolau, Oʻahu
#geology #geoscience #zeolite #volcano #hydrothermal #amygdule #metamorphism
Muscovite-out reaction, when mica is turned into a see of K-feldspars in between biotite grains. Cordierite and andalusite are also around.
#geology #metamorphism
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Dive deep with us! 🌍✨ Metamorphic rocks reveal Earth's secrets. Heat and pressure transform old rocks into stunning new ones like shimmery schist or boldly banded gneiss. Every layer tells a story of intense geologic change! #Metamorphism #Geology #EarthScience #RockHounds #BlueskyGeo
vesuvianite crystals in thin section
vesuvianite crystals in thin section
Starting from where I have left... #Vesuvianite grains in contact metamorphosed #marble
#geology #thinsection #petrography #minerals #MineralMonday #metamorphism
📢 Paper alert! Liu et al. show ultra-fast #metamorphic reactions (8 days to <1 yr) during regional #metamorphism. Trace element #diffusion in garnet reveals melt-assisted corona growth at rates previously thought exclusive to contact metamorphism or lab settings.
doi.org/10.1016/j.gc...
Garnet-albite schist
Today's first sample is a garnet-albite schist.
FOV 3 mm | CPL + gypsum plate
#geology #garnet #schist #metamorphism
#FossilFriday here's one of the samples in thin section. The dark blobs are the #acritarchs. The brown is biotite, and the green is chlorite and hornblende. So the rock has experienced both pro- and retrograde #metamorphism #geology #paleontology 🧪⚒️
Microscope photo of a black triangular microfossil that is pierced by long needle shaped crystals.
Another #precambrian #acritarch that has suffered from #metamorphism This time it has been internally impaled by amphiboles which is a great name for a death metal song about metamorphic #fossil taphonomy #geology #paleontology 🧪⚒️
SciTech Chronicles. . . . . . . . .May 17th, 2025
bit.ly/stc051725
#volcanoes #Io #collision #gravitational #AMOC #dilution #mass #expansion #sediment #cooling #ice-sheet #AMOC #Negev #pendants #child #"Tel Malḥata" #SAR #Magellan #metamorphism #subduction
Polished slab of eclogite, a rock produced by metamorphism in subduction zones
For #RockinTuesday I show you this neat #eclogite slab exposed in an open air museum in the Besshi area (Shikoku, Japan). Along the usual red garnet and green omphacite, this rock contains quartz, calcite, rutile, zoisite, kyanite, and phengite.
FOV about 10 cm.
#geology #minerals #metamorphism
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💥BIG NEWS💥 The post-proof version of the paper on low-grade #metamorphic rocks is now available on the journal website.
Read the paper▶️ doi.org/10.1180/mgm....
#geosciences #Earth #metamorphism #subduction
A glacial erratic pebble - this could be classified as a sillimanite gneiss. It is greenish-grey in colour, with white and blue-green crystals with co-aligned fabric orientation.
A close-up photo of the specimen, showing details of crystalline fabric - green acicular crystals of sillimanite interspersed with quartz and weathered feldspar crystals. There is a distinct co-alignment in the crystalline fabric. Magnified c.15x with f.o.v. circa 1cm.
![Close up view of specimen, showing green acicular crystals of sillimanite set in pale matrix of [quartz] and [feldspar] and reddish brown garnet crystals, perhaps almandine. Magnified 40x with f.o.v. circa 5mm.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:7c3wn5rzzurxcu7ufow7revt/bafkreibp2bnn7wniyujkmhlmmaemtqgbtitucnqryzot5h74j37buccgie)
Close up view of specimen, showing green acicular crystals of sillimanite set in pale matrix of [quartz] and [feldspar] and reddish brown garnet crystals, perhaps almandine. Magnified 40x with f.o.v. circa 5mm.
The geological equivalent of an ornithological 'LBJ', this 'little grey job' glacial erratic w tiny garnets and 1000s of co-aligned sillimanite crystals, was found in a Suffolk field.
Originates somewhere up north, perhaps Glen Clova.
#geology #Scotland #metamorphism @scottishgeology.bsky.social
Layered blueschist sample. FOV 3 mm, PPL
1/ EXTRA - from the paper accepted yesterday - we have a new blueschist locality!
This is a really cool blueschist - that deserves an EBSD study in my opinion, because it is one of the few cases you can tie structures to the blueschist facies!
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#geology #blueschist #metamorphism
Wollastonite crystals (the prismatic objects) surrounded by marble (a type of metamorphic rocks), with a coin for scale
It was a bit windy and cold today, so I came close to these wollastonite crystals in contact-metamorphosed marbles to feel some warmth ♨️
Monte Capanne aureole, Elba
#geology #metamorphism
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First lecture of 2025 prepared! How do minerals grow and rocks form? Seems like a very basic question in geology, given how much of the science is build on the prerequisite of rocks existing in nature, but the answer is complex. #petrology #metamorphism #kinetics #thermodynamics
Need clever examples of P-T estimates of contact metamorphism around the world. With 'clever' I mean situations in which you find the right assemblage that really narrows it down to a limited pressure and temperature interval :)
You will get cited! ☺️
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#geology #metamorphism
Spotted this nice hammer-shaped apatite inclusion in an Archean monazite from Greenland 🔨🪨🔬. #thinsectionthursday #monazite #petrology #metamorphism #geology
Cross polarised light view of large (black) garnet crystal surrounded by multiple, mica (mainly muscovite) showing changing alignment around the garnet and gradually varying interference colours across the field of view.
Garnet mica schist from shores of Loch Ailort, Lochaber, Scotland. Part of the Morar Division of the Moine Succession. #ThinSectionThursday🧪⚒️
#thinsection #geology #metamorphism #petrology #scotland
Registration is now open for our short course on #EarlyEarth running 25-28th March 2025!
Sign up for an exciting interdisciplinary course covering research topics such as #tectonics #geochemistry #Archean #metamorphism #geobiology #provenanceanalysis #petrology #geochronology
Hello world!
The petrology research group of the Univ Göttingen is now on bsky!
Please stay tuned for any news and updates of our research as well as announcement of events and conference contributions from our group!
#geoscience #petrology #metamorphism #EarlyEarth #phaseeqilibria #electronoptics
🔥paper alert🔥 for the low-grade #metamorphism lovers. We use a multidisciplinary approach including semiquantitative and quantitative Methods to decipher the P-T history of low-grade #metapelites. @xmaptools.bsky.social
Read the pre-proof version ➡️ www.cambridge.org/core/journal...
A brown tourmaline grain, with inclusions of graphite (black) surrounded by chloritized biotite (light brown to green), and transparent minerals (quartz, white mica, albite). Image taken under polarized light. Field of view: 1.2 mm.
Euhedral #tourmaline grain with two sets of internal graphite inclusions indicating that it grew during #metamorphism.
Just to say that knowing more about how tourmaline behaves in metamorphic rocks would be great, but unfortunately it is a garbage-can mineral 😭
Sanbagawa belt, Japan
#geology
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A metabreccia sprinkled with chloritoid (dark green grains) and phengite (lustrous sheen).
Massa Unit, Apuan Alps, Italy
#geology #metamorphism
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metabreccia, a metamorphic rock - with coin for scale
Just your daily dose of metabreccia. Massa Unit, Apuan Alps, Italy.
#geology #metamorphism #metabreccia
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Photo stitching of an albite grain with plenty of inclusions of epidote and hematite in an amphibolite from the Sanbagawa metamorphic belt with hornblende, calcite, white mica, and quartz. FOV 6 mm, CPL
#geology #metamorphism #petrography #thinsection
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