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Posts by Tim Johnson

Lovely stuff this. Go Curtin!

7 months ago 1 0 0 0
A one-billion-year-old Scottish meteorite impact | Geology | GeoScienceWorld

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

11 months ago 3 0 0 0
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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

1 year ago 15 3 0 1
Jobs in Geoscience : Earthworks : 2 x PhD Opportunities - Tectonic Evolution and Geochronology of the Yilgarn Craton - Perth, Australia - Curtin University <div id="title">2 x PhD Opportunities - Tect...

#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

1 year ago 6 4 0 1

Granulite-facies coprolite?

1 year ago 1 0 0 0

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.

1 year ago 4 1 0 0
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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/...

1 year ago 3 0 0 2

Excellent chat!

1 year ago 1 1 0 0
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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...

1 year ago 3 4 0 0

love the use of 'potential' :)

1 year ago 1 0 0 0
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would love a trip down there some day...

1 year ago 1 0 0 0
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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...

1 year ago 2 1 2 0

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

1 year ago 0 0 2 0

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…

1 year ago 0 0 1 0
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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

1 year ago 6 2 0 0
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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...

1 year ago 60 17 2 7

diapiric rise...

1 year ago 1 0 1 0
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