#volcanic — Public Fediverse posts

#30DayMapChallenge : #Fire

The #Volcanic Isles . A brief history of volcanism across The British Isles.

Quite pleased with how this one turned out.

Location of volcanoes taken from wikipedia (spotted a mistake and got to make an edit to wikipedia in the process); fault lines from the #BGS 625k bedrock dataset and the IE GSI 500k Bedrock Geology for Ireland. Font: League-Spartan by the League of Moveable Type.

#requests, #pandas and #geopandas for scraping and wrangling.#scipy for making the proximity surface (that's the colour scheme), #matplotlib for plotting. With all labeling done manually in #inkscape.

EDIT: I've been kindly and helpfully informed that (a) Ben Nevis' age is closer to 399 Ma; (b) some are missing; (c) others perhaps shouldn't be there; (d) it's complicated. So, maybe don't use this map to make any strategic decisions.

#volcanism #volcano #imNotExtinctImDormant #magma #geology #faultlines

Mid-Proterozoic Expansion Of Passive Margins And Reduction In Volcanic Outgassing Supported Marine Oxygenation And Eukaryogenesis
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https://doi.org/10.1016/j.epsl.2025.119683 <-- shared paper
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https://zenodo.org/records/17353904 <-- supplementary data
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#proterozoic #platetectonics #tectonics #deepcarboncycle #eukaryogenesis #evolutionoflife #life #evolution #geology #geologichistory #pangea #supercontinent #diversification #volcanic #offgassing #marine #thermodynamics #model #modeling #spatialanalysis #spatiotemporal #nuna #subduction #structuralgeology #CO2 #carbondioxide #climate #eukaryotic #BoringBillion #rodinia #oceanbasins #marinechemistry #outgassing #global #earth

Scientist makes groundbreaking discovery while studying ancient Roman technique for concrete: 'We have a huge potential'

by Calvin Coffee
Sun, August 31, 2025

"Concrete has a massive carbon footprint. One researcher from the University of Auckland is working to reduce it by studying ancient #Roman techniques. Using natural volcanic materials and industrial byproducts, he's incorporating #pumice and #seashells to create an #EcoFriendly, traditional alternative.

"At the Structures Testing Laboratory in Newmarket, New Zealand, Enrique Del Rey Castillo blends volcanic ash and kaimoana shells as replacements in the cement-making process, leveraging their #SelfHealing properties, which can repair cracks over time through natural chemical reactions.

"This initiative is crucial, as concrete is one of the world's most polluting materials, with global cement production accounting for 8% of total carbon emissions, contributing to rising global temperatures and increasing health risks.

"Del Rey Castillo has spent years testing how local materials can serve as sustainable alternatives. After focusing on conventional substitutes such as fly ash, he shifted to natural materials available nearby.

" 'I realised we have a huge potential in New Zealand with the use of natural #volcanic materials and #byproducts of primary industries,' Del Rey Castillo said.

"Concrete is essential for constructing bridges, roads, dams, and buildings, but its production releases over 4 billion tons of carbon dioxide annually. Calcining cement-primary materials at 1,500 degrees Celsius in a kiln emits large amounts of carbon dioxide and produces chemical reactions. Each pound of concrete releases 0.93 pounds of carbon dioxide.

"Pumice, however, doesn't require the energy-intensive calcining process; it just needs to be dried at 100 degrees Celsius to remove moisture before being ground into a fine powder. 'The carbon footprint is about 8-10% of the carbon footprint of cement,' Del Rey Castillo explained."

Read more:
https://www.yahoo.com/news/articles/scientist-makes-groundbreaking-discovery-while-184500351.html

#SelfHealingConcrete #RomanConcrete #ReusingByproducts #Concrete #CarbonFootprint #Infrastructure #SolarPunkSunday #AncientTechnology

To See How The Ground Moves In Yellowstone, First Look At The Rest Of North America [GPS Monitoring And Geoscience]
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https://www.usgs.gov/observatories/yvo/news/see-how-ground-moves-yellowstone-first-look-rest-north-america <-- shared #USGS technical article
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#GIS #spatial #mapping #Yellowstone #monitoring #GPS #YellowstoneNP #geoscience #movement #volcanic #magma #deformation #NorthAmerica #tectonics #geology #engineeringgeology #risk #hazard #earthquake #subsidence #groundmovement #frameofreference #stress #vulcanism #regional #BasinAndRange #caldera #measurement #hydrothermal #NetworkOfTheAmericas
#NSF #NPS

The Mysterious Origins of #Sapphires Have Finally Been Deciphered
New research has found evidence that the azure gems can be forged in the fire and fury of #volcanic upheaval as extreme processes heat and compress aluminum oxide within the crust into a crystaline form called corundum; the main mineral that makes up sapphires. The research suggests that the sapphires formed in the upper crust, no more than 7 kilometers (4.3 miles) below the surface.
https://www.sciencealert.com/the-mysterious-origins-of-sapphires-have-finally-been-deciphered

I love a good #maar #volcano sequence.

A few shots of our work at the Estrada rhyolitic maar, one of the >10 #volcanic craters around the city of Kamembarhu, Kuanhasï juata (Mexico). These spectacular layers of pulverized bedrock and ashfall--exposed at a quarry--are the result of explosions caused by ascending #magma intruding into near-surface water reservoirs (in this case, shallow lakes). We call these types of events #phreatic eruptions. Note excavator for scale.