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Mastodon: AboutGet the appKeyboard shortcutsView source codev4.4.0-nightly.2025-04-15

#subduction

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Bill Minarik

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

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.
#Jade#Mineralogy#Subduction
Public
Bill Minarik

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
Public
Bill Minarik

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).

A figure from Huang et al (2020) showing the pressure-temperature stability field of Topaz-OH (grey) compared with several cold subduction zones (Tonga, Aleutian).
#MinCup24#Topaz#subduction
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💧🌏 Greg Cocks

Geologists Stunned On Discovering A Part Of The Earth That Disappeared 20 Million Years Ago
--
good.is/geologists-stunned-at- <-- shared technical article
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doi.org/10.1016/j.gr.2023.09.0 <-- shared paper
--
youtu.be/VyEUWySaFPc?si=rzUiIh <-- reconstruction animation
--
#GIS #spatial #mapping #remotesensing #geomagnetism #argoland #kinematicreconstruction #platetectonics #GPlates #junctionregion #PhilippineSeaPlate #Borneo #NewZealand #Japan #Zealandia #Philippines #NewGuinea #junction #subduction #plates #geology #structuralgeology #pontus #pontusplate #paeleogeography #geologichistory #Zealandia #seismology #spatialanalysis #spatiotemporal #tomography #model #modeling

maps - paleogeography over time
maps - the Pangea-Tethys and Panthalassa plate tectonic realms separated by the Juction Region
map - tectonics of the Philippine Sea Plate, highlighting the different microplates that formed as a result of oceanic spreading at different spreading centers
map - reconstructed region
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