#archean — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #archean, aggregated by home.social.
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@FaithfullJohn Here's a hand sample photo of a komatiite flow from nearby in the Abitibi of Quebec, also ~ 2.7 Ga.
#Abitibi #Quebec #Komatiite #Archean #Geology -
@FaithfullJohn Here's a hand sample photo of a komatiite flow from nearby in the Abitibi of Quebec, also ~ 2.7 Ga.
#Abitibi #Quebec #Komatiite #Archean #Geology -
Massive #hematite later brecciated by quartz veining, From the Soudan ironstone, Ely greenstone belt, Vermilion district of northern Minnesota.
These ironstones are sandwiched between pillow basalts of approximately 2.7 billion years old.
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Massive #hematite later brecciated by quartz veining, From the Soudan ironstone, Ely greenstone belt, Vermilion district of northern Minnesota.
These ironstones are sandwiched between pillow basalts of approximately 2.7 billion years old.
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Today, molybdenum is one of the most common trace elements in the ocean due to oxidative weathering of #Molybdenite. But in the Archean the oceans were reducing, and molybdenum was scarce.
Other nitrogenases evolved to use other transition elements, but Mo-nitrogenase was first, and best.
Molybdenite enables the Earth's biosphere!
#MinCup25 #NitrogenFixation #Nitrogenase #Archean #GreatOxidationEvent #OreCup #OreCup25
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Today, molybdenum is one of the most common trace elements in the ocean due to oxidative weathering of #Molybdenite. But in the Archean the oceans were reducing, and molybdenum was scarce.
Other nitrogenases evolved to use other transition elements, but Mo-nitrogenase was first, and best.
Molybdenite enables the Earth's biosphere!
#MinCup25 #NitrogenFixation #Nitrogenase #Archean #GreatOxidationEvent #OreCup #OreCup25
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#Molybdenite is the primary host for the element molybdenum in the Earth's crust.
Molybdenum is part of the most effective biological molecule for nitrogen fixation (Mo-nitrogenase), which converts atmospheric N2 to a bio-available form.
The grey sphere is Mo; this complex molecule likely evolved more than 3.2 billion years ago.
#MInCup25 #NitrogenFixation #Nitrogenase #Archean #OreCup #Orecup25 -
#Molybdenite is the primary host for the element molybdenum in the Earth's crust.
Molybdenum is part of the most effective biological molecule for nitrogen fixation (Mo-nitrogenase), which converts atmospheric N2 to a bio-available form.
The grey sphere is Mo; this complex molecule likely evolved more than 3.2 billion years ago.
#MInCup25 #NitrogenFixation #Nitrogenase #Archean #OreCup #Orecup25 -
A well illustrated talk by Dr. Ali Polat (University of Windsor, Ontario), the 2024 Geological Associate of Canada Robinson lecturer. He gave persuasive evidence for compressive tectonics throughout the Archean.
Figure is of refolded isoclinal folds in the Archean (2.8 Ga) Storø Greenstone belt, southern West Greenland.
#McGillUniversity #GAC #UWindsor #Ontario #Canada #Greenland #Archean #Geology #Tectonics
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A well illustrated talk by Dr. Ali Polat (University of Windsor, Ontario), the 2024 Geological Associate of Canada Robinson lecturer. He gave persuasive evidence for compressive tectonics throughout the Archean.
Figure is of refolded isoclinal folds in the Archean (2.8 Ga) Storø Greenstone belt, southern West Greenland.
#McGillUniversity #GAC #UWindsor #Ontario #Canada #Greenland #Archean #Geology #Tectonics
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Plain light thin section (~ 4 cm wide)
Pale pink garnets (inclusion-rich cores and inclusion-free rims) surrounded by mostly biotite.From the Nuvvuagittuq formation near #Inukjuak Canada.
Coupled Sm-Nd isotopes suggest that the original rock (the protolith) may be as old as 4.3 billion years. This sample has been pervasively metamorphosed at least four times since then.
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Plain light thin section (~ 4 cm wide)
Pale pink garnets (inclusion-rich cores and inclusion-free rims) surrounded by mostly biotite.From the Nuvvuagittuq formation near #Inukjuak Canada.
Coupled Sm-Nd isotopes suggest that the original rock (the protolith) may be as old as 4.3 billion years. This sample has been pervasively metamorphosed at least four times since then.
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New Geological Study Shows Scandinavia Was Born In Greenland
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https://phys.org/news/2024-03-geological-scandinavia-born-greenland.html <-- shared technical article
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https://doi.org/10.1130/G51658.1 <-- shared paper
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“The oldest Scandinavian bedrock was "born" in Greenland according to a new geological study from the University of Copenhagen. The study helps us understand the origin of continents and why Earth is possibly the only planet in our solar system with life..."
#geology #structuralgeology #Scandinavia #greenland #finland #research #crust #mantle #zircon #gneiss #denmark #craton #lithosphere #shield #FennoscandianShield #Archean #Eoarchean #NorthAtlanticcraton #geologymap #mapping -
New Geological Study Shows Scandinavia Was Born In Greenland
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https://phys.org/news/2024-03-geological-scandinavia-born-greenland.html <-- shared technical article
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https://doi.org/10.1130/G51658.1 <-- shared paper
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“The oldest Scandinavian bedrock was "born" in Greenland according to a new geological study from the University of Copenhagen. The study helps us understand the origin of continents and why Earth is possibly the only planet in our solar system with life..."
#geology #structuralgeology #Scandinavia #greenland #finland #research #crust #mantle #zircon #gneiss #denmark #craton #lithosphere #shield #FennoscandianShield #Archean #Eoarchean #NorthAtlanticcraton #geologymap #mapping -
A very cool talk this week at GEOTOP by André Pellerin, University of Quebc at Rimouski. He spoke on the strange chemistry and biology of Lake Untersee, east Antarctica. This lake is perpetually ice-covered and the bottom covered with #stromatolites (microbial mats) similar to those found in ecosystems three billion years in Earth's past.
#UCAR #Antarctica #Rimouski #Quebec #Archean #GEOTOP -
A very cool talk this week at GEOTOP by André Pellerin, University of Quebc at Rimouski. He spoke on the strange chemistry and biology of Lake Untersee, east Antarctica. This lake is perpetually ice-covered and the bottom covered with #stromatolites (microbial mats) similar to those found in ecosystems three billion years in Earth's past.
#UCAR #Antarctica #Rimouski #Quebec #Archean #GEOTOP -
Box Tomography - First Application To The Imaging Of Upper-Mantle Shear Velocity And Radial Anisotropy Structure Beneath The North American Continent
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https://doi.org/10.1093/gji/ggy078 <-- shared paper
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#GIS #spatial #mapping #USA #NorthAmerica #geology #structuralgeology #EarthScope #EarthScopeTranspotableArray #array #remotesensing #monitoring #CONUS #seismology #seismicvelocity #tomography #model #modeling #numericmodeling #mantle #crust #subsurface #geophysics #lithosphere #asthenosphere #teleseismic #wavefield #BoxTomography #computing #archean #continent #cratonic #cratons #LVZ #3d #spatialanalysis -
Box Tomography - First Application To The Imaging Of Upper-Mantle Shear Velocity And Radial Anisotropy Structure Beneath The North American Continent
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https://doi.org/10.1093/gji/ggy078 <-- shared paper
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#GIS #spatial #mapping #USA #NorthAmerica #geology #structuralgeology #EarthScope #EarthScopeTranspotableArray #array #remotesensing #monitoring #CONUS #seismology #seismicvelocity #tomography #model #modeling #numericmodeling #mantle #crust #subsurface #geophysics #lithosphere #asthenosphere #teleseismic #wavefield #BoxTomography #computing #archean #continent #cratonic #cratons #LVZ #3d #spatialanalysis -
Monday's early-career presenters at #AGU23 in San Francisco, California.
*Aube Gourdeau*
T11D-0188 An Ongoing Search for Active Faults in the Western Quebec Seismic Zone, Eastern Canada
Mid-day posters, Monday*Jillian Kendrick*
V13C-0134 Chloritoid as an Indicator of Metasomatic Processes in Archean Greenstone Belts
Evening posters, Monday#McGillUniversity #GeoScience #Seismology #Archean #Geology #EarthSystemScience
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Monday's early-career presenters at #AGU23 in San Francisco, California.
*Aube Gourdeau*
T11D-0188 An Ongoing Search for Active Faults in the Western Quebec Seismic Zone, Eastern Canada
Mid-day posters, Monday*Jillian Kendrick*
V13C-0134 Chloritoid as an Indicator of Metasomatic Processes in Archean Greenstone Belts
Evening posters, Monday#McGillUniversity #GeoScience #Seismology #Archean #Geology #EarthSystemScience
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We learned about forming the Archean continental crust today from Dr. Jill Kendrick. Using modelling, field investigations, and geochemistry she was able to constrain the hydrous melting of mafic crust to form granitoids (TTGs to be specific). Field shot from the Kapuskasing Structural Zone in Ontario.
#Archean #Geology #Tectonics #McGillUniversity #ContinentalCrust -
We learned about forming the Archean continental crust today from Dr. Jill Kendrick. Using modelling, field investigations, and geochemistry she was able to constrain the hydrous melting of mafic crust to form granitoids (TTGs to be specific). Field shot from the Kapuskasing Structural Zone in Ontario.
#Archean #Geology #Tectonics #McGillUniversity #ContinentalCrust -
Thank you very much for sharing this interesting aspect.
I shall read it later on.Is this similar to the #phototrophs of the #Archean Eon (07:16 min, see link below) 3.6-2.5 bn yrs ago, which invented #photosynthesis, using hydrogen and dissolving sulphite to create sulphur and suphuric acid?
(not to be equated with the #GreatOxidationEvent shown in the preview below)
https://www.youtube.com/watch?v=H476c8UjLXY&list=WL&index=24
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Thank you very much for sharing this interesting aspect.
I shall read it later on.Is this similar to the #phototrophs of the #Archean Eon (07:16 min, see link below) 3.6-2.5 bn yrs ago, which invented #photosynthesis, using hydrogen and dissolving sulphite to create sulphur and suphuric acid?
(not to be equated with the #GreatOxidationEvent shown in the preview below)
https://www.youtube.com/watch?v=H476c8UjLXY&list=WL&index=24
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Fun couple of days exploring the local #Lewisian geology with
@early_earth_tim
Firstly the #Archean (approx. 2.8 billion years old) ultrabasic intrusions at Maaruig (Maraig).
Then 3D outcrop mapping #Laxfordian folds in the Ness assemblage supracrustals at Eoropaidh (Eoropie).
