#mincup25 — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #mincup25, aggregated by home.social.
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On rocks, from Mineral Cup’s admin, @mikamckinnon
She writes:
#Hematite is a key mineral in banded iron formations. And BIFs are my BFFsVery well done! BIFs make their appearance around minute five.
https://www.ted.com/talks/mika_mckinnon_do_you_have_a_rock
Thanks for the heads up
@vickyveritas
@vickyveritas.bsky.social#MinCup25 #BandedIronFormation #GreatOxidationEvent #Stromatolites #EarthHistory #EarthSystemScience
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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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#Sanidine from the Fish Canyon Tuff is essential to understanding the pace of events in the #Cenozoic
High potassium, quickly erupted and cooled, and old enough to have accumulated sufficient 40Ar from radioactive decay. These crystals calibrate neutron flux for 40Ar/39Ar dating. The 28.2 Ma age of the FCT sanidine has been fine-tuned using #Milankovitch cycles of other ash beds in stable sedimentary basins.
photo from MinDat.org by Dan Polhemus