Mastodawn

Last night was our second lecture of the MSHI Volcano Naturalist program. The title of the lecture was Volcanos 101. The starting point was plate tectonics then burrowing into the regional setting. Then a focus on igneous rocks, petrology, minerology, geochemistry. It’s a complicated topic but was presented well. I can see it being very challenging and difficult to visualize for someone who has never had a class in geology. #geology #volcano #tectonics #Cascades #PNW #igneous

John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿Jan 29

#ThinSectionThursday Some new photographs taken today from a rock collected during my PhD work on the island of Rum, a lonnggg time ago!

The rock is a lovely fresh gabbro from Unit 3 of the Rum Layered Intrusion. Pic shows small rectangular-ish crystals of plagioclase, a large irregular xl of olivine (centre) all embedded in a single large oikocryst of clinpyroxene. Field of view about 3.5mm wide.

More info on each image in in Alt txt.

#Geology #Igneous #Microscopy #Rum #Paleocene

John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿Dec 28

Microgabbro: freshly broken and weathered surfaces of exactly the same rock, in Ardura forest, Mull, yesterday.

#Geology #Igneous #Gabbro #Weathering #Mull #Paleocene

💧🌏 Greg Cocks Nov 20

Why Is The Federal Government Spending Millions On Aerial Geological Mapping In Southern Colorado?
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https://www.cpr.org/2025/11/19/geological-survey-earth-mri-colorado-minerals/ <-- shared media article
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https://www.usgs.gov/earth-mapping-resources-initiative-earth-mri <-- shared (USGS) Earth Mapping Resources Initiative (Earth MRI) entry page
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https://ngmdb.usgs.gov/emri/#3/40/-96 <-- shared Earth MRI web map(s)
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https://www.usgs.gov/centers/gggsc <-- shared USGS Geology, Geophysics, and Geochemistry Science Center entry page
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https://mrdata.usgs.gov/earthmri/data-acquisition/project.php?f=html&pid=1071 <-- shared USGS Colorado Alkaline Igneous Belt Survey report
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https://www.usgs.gov/programs/mineral-resources-program/science/what-are-critical-minerals-0 <-- shared final 2025 #DOI / #USGS report on list of critical minerals
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#geophysics #remotesensing #earthobservation #airborne #mapping #spatial #criticalminerals #colorado #geology #structuralgeology #Colorado #USA #EarthMRI #SouthernColorado #geologicdata #geologicmapping #geochemistry #igneous #survey #geophysicalsurvey #economic #economy #mineral #mineralresources
@CPR @USGS @NV5

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Jason Sep 19

Two classes of #igneous rocks this week.

https://en.wikipedia.org/wiki/Igneous_rock

https://en.wikipedia.org/wiki/Igneous_rock#/media/File:Mineralogy_igneous_rocks_EN.svg

https://en.wikipedia.org/wiki/Intrusive_rock

https://en.wikipedia.org/wiki/Extrusive_rock

Attendance 75/109 and 72/109 #GL101

Igneous rock - Wikipedia

John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿Sep 18

#ThinSectionThursday Here's a lovely starburst of dendritic plagioclase crystals in a basalt from the Rubha a' Chromain intrusion, near Carsaig on the south coast of Mull. Feathery/plant-like crystals like this are typical of fast crystal growth in magmas caused by rapid cooling. Field of view ca. 2mm wide. One of 5500 rock thin sections made by Alex Herriot at his home in East Kilbride, now in the Hunterian Museum, University of Glasgow.

#Geology #Mull #Microscopy #Igneous

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John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿Jun 16, 2025

@ark_brut Orbicular granites🤩 🤩 Finland has lots of these lovely rocks 🥰 #Geology #Igneous

John Faithfull 🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡✊🏻✊🏿Mar 23, 2025

📢 🤓 Ultra-niche book alert! 🤓 Not for everybody, but this is an absolutely *stunning* book: Stearns Morse's updated 2024 edition of Basalts and Phase Diagrams: https://link.springer.com/book/10.1007/978-3-030-97882-2 It is beautifully written (and often funny), comprehensive, wise and informative. This is the kind of thing you can only do using book format. If you work on igneous rocks, or in experimental petrology, read it! 🤩 🤩 🤩 #Geology #Igneous #IgneousPetrology #PhaseDiagrams #ExperimentalPetrology

Basalts and Phase Diagrams

This book discusses parameters of mineral systems at high pressures, and covers essentials of physical chemistry applied to silicate liquids and crystals.

SpringerLink

💧🌏 Greg Cocks Mar 19, 2025

The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents)
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https://georoc.eu/georoc/new-start.asp <-- shared link to GEOROC resource
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H/T Paul Cleverley glasses curly blonde hair
“The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents) is a comprehensive collection of published analyses of igneous and metamorphic rocks and minerals. It contains major and trace element concentrations, radiogenic and nonradiogenic isotope ratios as well as analytical ages for whole rocks, glasses, minerals and inclusions. Metadata include geospatial and other sample information, analytical details and references….
Current content of GEOROC:
• 22,750 papers
• 685,660 samples
• 2,680,100 analyses
• 39,334,100 single data values…”
#opendata #geology #geoscience #GEOROC #database #global #igneous #metamorphic #rocks #minerals #geochemistry #results #analyses #published #metadata #spatial #GIS #mapping #papers #samples #datavalues

Geochemical Rock Database-Query

GEOROC - Geochemical Database on magmatic Rocks

Tourmaline Queen 💅Feb 24, 2025

Geology is just another way of saying “rock-based double entendres”

Also yes my masters project was looking at hot dykes down a lens (oceanic crust alteration veins, behave)

#geology #meme #cat #igneous #hot