#pillowbasalt — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #pillowbasalt, aggregated by home.social.
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@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 -
@allochthonous @silicatefondue @geo_garver
Fabulous #pillowBasalt image, and I’m happy to have visited your website. Please keep the cross cutting relationship animation up, I’ll refer my #EarthScience class at #UMassBoston to it. Super!
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The pillow rinds have preferentially weathered, outlining the basalt pillows formed at least 3.75 and perhaps as long ago as 4.3 billion years ago. Now metamorphosed to amphibolite grade. In the Ujaraaluk unit of the Nuvvuagittuq Greenstone Belt, near #Inukjuak, northern #Quebec. #McGill University #EarthSystemScience #PillowBasalt #Hadean 1/2