Lmst

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

A #Subduction zone is a geological area where two tectonic plates collide, and one plate sinks or "subducts" beneath the other and is forced into the Earth's mantle.

This process is a result of density differences between the two plates and can trigger powerful #Earthquakes, volcanic eruptions, and #Tsunamis.

https://knowledgezone.co.in/kbits/69159c75eeb3621d436d25db

Rare blue yoderite replacing kyanite (-talc + quartz). Only found in two places on Earth (Tanzania and Zimbabwe), yoderite forms at high pressure in hot subduction zones from rocks rich in in Mg and Al, poor in alkalis and Ca, in the presence of water and oxidized ferric iron (±Mn).

Named after Hat Yoder of the Geophysical Lab, CIW.

#ThinSectionThursday #Yoderite #Kyanite #Whiteschist #Subduction #CarnegieInstitutionWashington #Tanzania #Zimbabwe

Blue yoderite ( Mg(Al,Fe3+)3(SiO4)2O(OH) ) surrounding remnant kyanite with talc and quartz. Plane polarized transmitted light.

Yoderite surrounding remnant kyanite with talc and quartz. Cross polarized transmitted light.

Unravelling The Dance Of Earthquakes - Evidence Of Partial Synchronization Of The Northern San Andreas Fault And Cascadia Megathrust
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https://doi.org/10.1130/GES02857.1 <-- shared paper
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“Previous paleoseismic work has suggested a possible stress triggering relationship between the Cascadia subduction zone and the northern San Andreas fault based on similar event timings. Turbidite successions correlated to both systems may support this hypothesis. Historic earthquakes in 1980 and 1992 in the Cascadia subduction zone and the 1906 earthquake on the northern San Andreas fault left turbidite records that are temporally well constrained by bomb-carbon−supported age-depth models..."
#geology #USWest #Seattle #Washington #California #earthquake #engineeringeology #fault #faulting #SanAndreas #Cascadiasubductionzone #linked #Cascadia #research #sediment #sedimentology #Turbidite #paleoseismology #historic #spatial #spatialanalysis #spatiotemporal #model #modeling #stress #subduction #dating #radiocarbon #Holocene

Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics

Increased Flood Exposure In The Pacific Northwest Following Earthquake-Driven Subsidence And Sea-Level Rise
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https://doi.org/10.1073/pnas.2424659122 <-- shared paper
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https://oregoncapitalchronicle.com/2025/05/02/big-one-coupled-with-rising-ocean-could-leave-many-in-northwest-living-in-flood-zones-study-finds/ <-- shared media article
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#GIS #spatial #mapping #coast #coastal #sealevelrise #sealevel #SLR #climatechange #PNW #PacificNorthWest #Cascadia #flood #flooding #risk #hazard #exposure #damage #infrastructure #publicsafety #geology #fault #faulting #engineeringgeology #subsidence #earthquake #floodplains #omgoing #spatialanalysis #model #deformation #modeling #roads #residents ##Washington #Oregon #California #subduction #communities #management #planning #mitigation #coastalengineering #sinking

SciTech Chronicles. . . . . .May 17th, 2025

https://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

https://www.wweek.com/news/schools/2025/03/26/the-truth-about-portlands-brick-schools-is-scarier-than-fiction/ #PDX #subduction #BigOne #quake #Portland #PortlandOR #PortlandOregon #schools #PPS #PortlandPublicSchools

SciTech Chronicles. . . . . . . . .Mar 26th, 2025

https://bit.ly/stc032625

#xenoliths #volatiles #subduction #models #spike #glycans #receptor #low-mutation ##Yellowknife #linear #dodecane #SAM #lipids #Mesoscale #signature #transport #photolysis #replenishment #size #thickness

SciTech Chronicles. . . . . . . . .Mar 19th, 2025

https://bit.ly/stc031925

#Anchorage #CO2 #SO2 #magma #Nylon-6,6 #fermentation #Electrochemistry #Biorenewable #Bedmap3 #fast-warming #flow #sea-level #aquifers #Seismometers #uplift #subsidence #MTZ #subduction #ringwoodite #wadsleyite

Beautiful cathode-luminescence images showing trace-element zoning and changes in fluid composition during growth of jadeite.

From: Sorena Sorensen, George E Harlow, Douglas Rumble III (2006) The origin of jadeitite-forming subduction-zone fluids: CL-guided SIMS oxygen-isotope and trace-element evidence. American Mineralogist 91: (7) 979-996

#Jade #Mineralogy #Subduction #Geology #Metasomatism #Smithsonian #NMNH

Cathode-luminescence images of the mineral jadeite. Colour changes indicate changes in trace-element or defect concentrations. The jadeite crystals first grew with red- or blue- colours, then are rimmed with green CL with increases in Ca, Mg, and Cr. All images have a FOV of 1.6 mm.

Sorena Sorensen passed away this month.

Sorena was a long-time curator at the National Museum of Natural History of the Smithsonian Institution. She was also an insightful and talented researcher who studied the role of fluids in metamorphism of subduction-related rocks. She also contributed to understanding the formation of jadeite and jade deposits.

News from Elizabeth Cottrell, also at #NMNH

#Geology #Petrology #Subduction #Smithsonian #Mineralogy

Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
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#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics

AI image - miner holding a large gold nugget in his hand

cross sections and charts - Mineral assemblages and dominant sulfur species in the devolatilization fluid for an average AOC along the hot (central Cascadia) and cold (central Honshu) subduction pressure–temperature (P-T) paths.

cross sections and charts - Mantle wedge oxidation models showing the oxidation capacity of slab devolatilization fluids.

cross sections - Proposed scenarios for progressive devolatilization and redox processes at slab–mantle interface.

Here’s a great opportunity to publish your research on the Cascadia Subduction Zone alongside other experts in this special issue.

Submissions are still open. Explore topics and details here:

https://seismica.library.mcgill.ca/announcement/view/17

#cascadia #subduction #earthquake #Seismology #EarthquakeScience #openaccess #diamondopenaccess #scientificjournal #geosciences #openscience

Ancient Sunken Seafloor Reveals Earth’s Deep Secrets – A Mysterious Subduction Zone Deep Beneath The Pacific Ocean, Reshaping Our Understanding Of Earth’s Interior
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https://cmns.umd.edu/news-events/news/nicholas-schmerr-vedran-lekic-ancient-sunken-seafloor-reveals-earths-deep-secrets <-- shared technical article
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https://doi.org/10.1126/sciadv.ado1219 <-- shared paper
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#GIS #spatial #mapping #geology #structuralgeology #seafloor #geologichistory #EastPacificRise #remotesensing #seismic #seismology #mantle #crust #subduction #tectonicplates #model #modeling #LLSVP #imaging #mantletransition #Pacific #PacificOcean #SouthAmerica #research

An illustrative diagram showing the ancient subducted 'slab' we resolved at present day. It has a direct impact on the large-scale lowermost mantle structures known as 'superplumes'.

A map of the East Pacific Rise region where the discovery of an ancient seafloor was made.

maps - The relationship between subduction locations, transition zone thickening, and LLSVP distribution

maps - Map of MTZ discontinuities and tomographic depth slices

The submission deadline for our special edition on the Cascadia Subduction Zone is fast approaching!

If you've done research in this fascinating area, don't miss the opportunity to showcase your work. Check out the latest publications here:

https://seismica.library.mcgill.ca/issue/view/91

#cascadia #subduction #seismology #earthquake #EarthquakeScience #peerreviewed #OpenAccess #DiamondOpenAccess #scientificjournal

Early career presenter at #GSAConnects2024 tomorrow:
Dr. Noah Phillips
Wednesday, 25 Sep, 08:20 AM - 08:40 AM , Room 304B
speaking on:
WHY DO SUBDUCTION THRUSTS LOCK? EVOLVING EFFECTIVE GRAIN SIZES MODULATE CREEP RATES THROUGH PRESSURE SOLUTION

Noah is starting up at USC and is looking for potential graduate students.

#GSA2024 #Geology #Subduction #LakeheadU #USC

A Gigapan image of #omphacite from Jenner, California.

The glorious green omphacite is surrounded by assorted other minerals.

https://www.gigapan.com/galleries/7874/gigapans/17328
Ron Schott

#MinCup24 #Geology #Eclogite #Subduction

At high pressures, fluorine-free topaz is stable: Topaz-OH. It's likely present only on recent Earth in our solar system: water, aluminous sediments (shales; pelites) from continental crust and cold subduction zones are all required.

Given these, Topaz-OH can potentially transport water into the mantle transition zone (where it's stored in #ringwoodite ) Figure from Huang et al (2020).

#MinCup24 #Topaz #subduction #mantle #DeepWaterCycle