#hadean — Public Fediverse posts

Mineral Monday: Mobile- and Stagnant-lid Tectonics on the Hadean Earth Continents and recycled crust via subduction may have formed earlier than previously thought. (Valley JW, et al 2026: doi.org/10.1038/s415.... By John Valley #MSACommunications #MineralMonday #mineral #zircon #Hadean #JackHills

Origin of water on Earth (Earth 🌍)

The origin of water on Earth is the subject of a body of research in the fields of planetary science, astronomy, and astrobiology. Earth is unique among the rocky planets in the Solar System in having oceans of liquid water on its surface. Liquid water, which is necessary for all known forms of life, continues to exist on the surface of ...

https://en.wikipedia.org/wiki/Origin_of_water_on_Earth

#OriginOfWaterOnEarth #Earth #Water #Hadean #Origins #Beginnings

4.3 billion year old rocks:
https://www.cbc.ca/news/science/oldest-rocks-1.7571554
#Nunavik #Hadean #greenstone

Jonathan O'Neil of the University of Ottawa telling the story of the Hadean mantle and crust from the few scraps of rocks left to us from that time. Short- and long-lived isotopic systems constrain the timing and processes of the Earth's first crust. The second keynote at the Geotop annual meeting, hosted at ÉTS.

#UOttawa #ETS_Montreal #Geotop #UQAM #Hadean #EarthsMantle #Geochemistry

Origin of water on Earth (Earth 🌍)

The origin of water on Earth is the subject of a body of research in the fields of planetary science, astronomy, and astrobiology. Earth is unique among the rocky planets in the Solar System in having oceans of liquid water on its surface. Liquid water, which is necessary for all known forms of life, continues to exist on the surface of ...

https://en.wikipedia.org/wiki/Origin_of_water_on_Earth

#OriginOfWaterOnEarth #Earth #Water #Hadean #Origins #Beginnings

#Hadean awarded #DASA contract to populate #BritishArmy LVC training using #GenerativeAI
https://www.armyrecognition.com/defense_news_february_2024_global_security_army_industry/hadean_awarded_dasa_contract_to_populate_british_army_lvc_training_using_generative_ai.html

#bot #miltodon
Original tweet: https://nitter.tinfoil-hat.net/ArmyRecognition/status/1753033406751891749

@Anthro @Ceedave The 4.3 Ga age is from coupled Nd-Sm systems (short and long lived); the mafic rocks do not have zircons. The younger age is from zircons in cross-cutting felsic units. This is the work of Jonathan O'Neil (now at #uottawa) https://mcgillnews.mcgill.ca/s/1762/news/interior.aspx?sid=1762&gid=2&pgid=1190

https://en.wikipedia.org/wiki/Nuvvuagittuq_Greenstone_Belt

Some of the rind remains and is compositionally distinct. Recent work has used triple oxygen to constrain seawater chemistry (https://www.sciencedirect.com/science/article/abs/pii/S0012821X22001753)
#Hadean #McGilUniversity #PillowBasalt