John Faithfull 🌍🇪🇺🏴🧡✊🏻✊🏿Fascinating paper: the preservation of beautiful primary sedimentary features in these Archaean rocks from South Africa is 🤯🥰🤓.
Effect of a giant meteorite impact on Paleoarchean surface environments and life | PNAS
https://www.pnas.org/doi/10.1073/pnas.2408721121
Peter L Bowden
Tiger stipe camouflage isn't really effective on the west coast of the #IsleofLewis👀
Compositional (rhythmic?) banding is preserved locally within an occurrence of #Lewisian "Older Basic Suite" meta-basics/ultrabasics.
#Archaean
Compositional (rhythmic?) banding is preserved locally within an occurrence of #Lewisian "Older Basic Suite" meta-basics/ultrabasics.
#Archaean
#FridayFold seen in a new road cutting near Stornoway.
#Archaean Lewisian gneiss is cut by mafic #OuterHebrides dyke. Both are then folded during the #Laxfordian.
Cross cutting of the gneissic foliation can be seen in the core of the fold, whilst the limbs are concordant.
@PeterLBowden1 Beautiful - those layered garnet-rich rocks are 🤩 🥰 !!! #Geology #Metamorphic #Archaean
💧🌏 Greg CocksThe Craton Enigma - Scientists Propose a New Continental Formation Theory
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https://scitechdaily.com/the-craton-enigma-scientists-propose-a-new-continental-formation-theory/ <-- shared technical article
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https://doi.org/10.1038/s41586-024-07307-1 <-- shared paper
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#GIS #spatial #mapping #geology #structuralgeology #cratons #craton #planetary #evolution #platetectonics #earth #structure #geologicalhistory #cooling #rock #weathering #erosion #water #Archaean #continental #crust #mantle #landmasses #continentalcrust #subaerial #magma #terrigenous #sediments #sedimentation #lithosphere
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https://scitechdaily.com/the-craton-enigma-scientists-propose-a-new-continental-formation-theory/ <-- shared technical article
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https://doi.org/10.1038/s41586-024-07307-1 <-- shared paper
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#GIS #spatial #mapping #geology #structuralgeology #cratons #craton #planetary #evolution #platetectonics #earth #structure #geologicalhistory #cooling #rock #weathering #erosion #water #Archaean #continental #crust #mantle #landmasses #continentalcrust #subaerial #magma #terrigenous #sediments #sedimentation #lithosphere
The Craton Enigma: Scientists Propose a New Continental Formation Theory
Ancient, vast stretches of continental crust known as cratons have stabilized Earth's continents for billions of years through shifts in landmasses, mountain formation, and ocean development. Scientists from Penn State have suggested a new mechanism that could explain the formation of cratons around
Matt WillemsenWhat would the late heavy bombardment have done to the Earth’s surface?
https://arstechnica.com/science/2024/01/massive-melts-and-monstrous-tsunamis-resulted-from-early-earth-impacts/ #Earth #asteroid #bombardment #LHB #archaean #spherule #layers
https://arstechnica.com/science/2024/01/massive-melts-and-monstrous-tsunamis-resulted-from-early-earth-impacts/ #Earth #asteroid #bombardment #LHB #archaean #spherule #layers
Matt WillemsenEvidence of Earth’s Oldest Glaciers Found in South Africa
The ancient glaciers hint at an Archaean Earth that may have looked similar in some ways to our own time.
Drawing on multiple lines of evidence from some of the oldest undisturbed rocks on Earth, the study authors said they see evidence for ice sheets during the planet’s ancient Archaean eon similar to those found today in mountain ranges across the world. It is the oldest evidence of glaciers ever discovered.
https://eos.org/articles/evidence-of-earths-oldest-glaciers-found-in-south-africa
#glaciers #SouthAfrica #archaean #Pongola #Supergroup
The ancient glaciers hint at an Archaean Earth that may have looked similar in some ways to our own time.
Drawing on multiple lines of evidence from some of the oldest undisturbed rocks on Earth, the study authors said they see evidence for ice sheets during the planet’s ancient Archaean eon similar to those found today in mountain ranges across the world. It is the oldest evidence of glaciers ever discovered.
https://eos.org/articles/evidence-of-earths-oldest-glaciers-found-in-south-africa
#glaciers #SouthAfrica #archaean #Pongola #Supergroup
Lukas VFN 🇪🇺Evidence of Earth’s Oldest #Glaciers Found in South Africa
https://eos.org/articles/evidence-of-earths-oldest-glaciers-found-in-south-africa #discovery #science
Earth’s first #glaciation at 2.9 Ga revealed by triple oxygen #isotopes https://www.geochemicalperspectivesletters.org/article2319/
"Drawing on evidence from some of the oldest undisturbed rocks on #Earth, the study authors said they see evidence for #IceSheets during the #planet’s ancient #Archaean eon similar to those found today in #mountain ranges across the world. It is the oldest evidence of glaciers ever #discovered"
