Biotite in thin section
My ADHD is forcing me to keep posting these biotites, so I am opening a 3ad. I am sorry! All pics are 3 mm wide.
#ThinSectionThursday #geology #structuralgeology #micafish #mylonite
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biotite mineral fish in thin section
#ThinSectionThursday where are you going, little biotite?
#geology #granite #mylonite
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microstructures of the carbonated serpentinite shear zones
Both talc mylonites and breccia show top-to-E (Apenninic) sense of shear. The fabric is obviously controlled by the quantity of #talc, abundant in #mylonite and less diffuse in #breccia, where #dolomite dominates.
6/x
Biotite fish in mylonitic granite.
Island of Elba, Italy
FOV 3 mm
#geology #thinsection #granite #mylonite #micafish #biotite
If I had a penny for every mylonite I have seen, I would now have about 75 pennies!
#geology #thinsection #petrography #granite #mylonite
ultra-thin section of marble
#ThinSectionThursday My PhD supervisor, Giovanni Musumeci, used these STUNNING ultra- #thinsections of #marble to document #shearzones in the Elba contact aureoles
Paper: doi.org/10.1130/GES0...
I am in love. Gonna take a lot of pics when I have time ❤️
FOV 3 mm CPL
#geology #marble #mylonite
The mylonites I am looking at right now are not rocks, they are paintings... and - oh! It's #ThinSectionThursday
Mylonitic granite, CPL
FOV about 3 cm
#geology #tectonics #structuralgeology #mylonite #quartz #feldspar #granite #rheology
mylonitic granite
There's plenty of fish in the Ocean
biotite-fishes happily swimming to the east in a sea of recrystallized quartz and feldspar.
FOV 3 mm CPL
#geology #thinsection #mylonite #granite
rolling object (sigma porphyroclast of feldspar) surrounded by recrystallized quartz and biotite in a mylonitic granite from Elba
They see me rollin'
They hatin'
#geology #mylonite (late) #ThinSectionThursday
Biotite (brown) replaced by chlorite (blue) in a mylonitic granite
How to make both Tectonics & Petrology folks happy!
Biotite #micafish replaced by chlorite
#mylonite #geology
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Another beautiful #mylonite derived from a #granite intruded in a shear zone. The big brown grains are #tourmaline.
FOV 3 mm CPL
#thinsection #geology
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Sheared calcite grains (orange) in a mylonitized quartz vein in mylonitic metagranite. Coin for scale
A famous shear zone with calcite porphyroclasts (orange) in sheared granite and quartz veins. Neves, SudTirol
Memories of EGU Summer School
#geology #mylonite #structuralgeology
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Mylonite, a rock produced by grain size reduction of minerals in a shear zone, seen in thin section under the microscope at crossed polarised light.
Photo stitching of a mylonite derived from a leucogranite dyke.
FOV is (I think) around 12-15 mm
Calamita, Island of Elba, Italy
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#geology #petrography #mylonite
This is not a rock.
.
.
.
.
This is a painting.
#geology #granite #mylonite
Reale, Island of Elba, Italy
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No more than 10 seconds to tell me the sense of shear.
Ready... steady... GO!
#mylonite #granite #geology
Collage of several microphotos across 1 cm width showing your friendly mylonitic marble of the neighborhood. The porphyroblasts are huge albites that contain glaucophane inclusions. Yes, this is the exhumed blueschist of Elba :)
#geology #mylonite #blueschist
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