#volcanic — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #volcanic, aggregated by home.social.
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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 -
Surviving the #Toba #volcanic #eruption 74,000 years ago https://scitechdaily.com/74000-years-ago-one-of-earths-largest-supervolcanoes-erupted-how-did-we-survive/ My take on #volcanoes and #evolution here https://nkozphoto.com/index.php/2025/09/24/volcanoes-climate-change-and-darwins-legacy-in-chile/ #climate #darwin #chile #archaeology #science
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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
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‘Mystery Volcano’ That Erupted And Cooled Earth In 1831 Has Finally Been Identified
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https://www.accuweather.com/en/weather-news/mystery-volcano-that-erupted-and-cooled-earth-in-1831-has-finally-been-identified/1729581 <--shared technical article
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https://doi.org/10.1073/pnas.2416699122 <--shared paper
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#GIS #spatial #mapping #glaciochemical #geochemistry #climate #climatechange #sulfurdioxide #neversummer #temperature #weather #icecore #LittleIceAge #dating #model #modeling #spatialanalysis #historic #volcanic #eruption #stratigraphy #Zavaritskii #caldera #ash #KurilIslands #Japan #Kamchatka #Russia #volcano #stratospheric #cryptotephra #tephra #andesite #dacite #Simushir #SimushirIsland -
#Volcanic #Supereruption May Have Aided #Human #Exodus From Africa
#Researchers working in the #Horn of Africa have #uncovered evidence showing how #Middle #Stone Age humans #survived in the wake of the #eruption of #Toba, one of the largest #supervolcanoes in #history some 74,000 years ago. The behavioral flexibility of these Middle Stone Age people not only helped them live through the supereruption but may have facilitated the later dispersal of modern humans out of Africa and across the rest of the world.English https://www.miragenews.com/volcanic-supereruption-may-have-aided-human-1199293/
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Synthesis of #prebiotic organics from CO2 by catalysis with #meteoritic and #volcanic particles: https://www.nature.com/articles/s41598-023-33741-8 -> A role for meteoritic #iron in the emergence of #life on Earth: https://www.mpia.de/news/science/2023-07-iron-meteorite