Tim Johnson

Lovely stuff this. Go Curtin!

Another paper that has been a huge fight, but a good outcome in the end. Boom!

pubs.geoscienceworld.org/gsa/geology/...

#geology #meteorite #this_one_is_not_a_crater

Formation and composition of Earth’s Hadean protocrust Nature - A modelling study shows that the trace-element composition of Earth’s Hadean protocrust is similar to that of the current average continental crust, severely compromising geochemical...

If anybody would like to read our @nature.com paper "Formation and composition of Earth’s Hadean protocrust", led by Simon Turner, you can do so here...

rdcu.be/ef9MB

#geology #science #early_earth #impacts

#Collab with the Geological Survey of WA we have 2 fully funded #PhD positions available looking at the "Tectonic Evolution and Geochronology of the Yilgarn Craton" a world famous mineral endowed classic.
www.earthworks-jobs.com/geoscience/c...
@geochronchris.bsky.social @bribeiro.bsky.social

Granulite-facies coprolite?

Fun, indeed. Having been to North Pole, and the Pilbara more generally (long ago) - I was v keen to hear detail about the idea it had been massively whacked by an extraterrestrial bolide 3.5 bn years ago.

Science In Action - New warnings, familiar faces, and radio pulses - BBC Sounds WHO pandemic call, an H5N1 call to arms from global health leaders.

Fun interview with @peaseroland.bsky.social from the BBC on the North Pole crater (beginning ~20 minutes in)…

www.bbc.co.uk/sounds/play/...

Excellent chat!

Giant glaciers pulverised Earth’s ancient rocks, setting the stage for complex life Hundreds of millions of years ago, rocks crushed under kilometres of ice injected vital nutrients into Earth’s oceans.

Rocks from 700 million years ago hold the clues. From glaciers bulldozing landscapes to meltwater rivers flushing chemical elements into the oceans = it’s a story of how land, sea, and sky are all geochemically connected. theconversation.com/giant-glacie...

love the use of 'potential' :)

would love a trip down there some day...

Shatter cone 2 - 3D model by Tim Johnson (@wonkiergruff) Shatter cone 2 - 3D model by Tim Johnson (@wonkiergruff)

Regarding our recent paper…
rdcu.be/ecqYe
…look at these lovely shatter cones in 3D. Lovely stuff…
sketchfab.com/3d-models/sh...

In answer to your second question, no, it cannot.

No, it isn’t. At least when treated in isolation. We have argued that the wider Pilbara Craton formed above a giant impact at 3.55 Ga. The smaller North Pole crater, about which we write, formed some 80 Myr later. If that seems an unlikely coincidence, look at the Moon…

A Paleoarchaean impact crater in the Pilbara Craton, Western Australia Nature Communications - Shatter cones in rocks in the Pilbara craton provide unequivocal evidence for oldest known impact crater on Earth, which struck 3.5 billion years ago.

rdcu.be/ecqYe

Earth’s oldest impact crater was just found in Australia – exactly where geologists hoped it would be The crater dates back 3.5 billion years, making it the oldest known by more than a billion years.

Boom theconversation.com/earths-oldes...

diapiric rise...