Carissimi Associati SGI,
Carissimi Soci Società Associate,
su indicazione del Prof. Rodolfo Carosi (Università di Torino e Presidente SGI) vi segnaliamo l'ultimo podcast di Geology Bites (Conversations about geology with researchers making key contributions to our understanding of the Earth and the Solar System):
Di seguito troverete il messaggio dell'ideatore, Oliver Strimpel, e il link al sito web di Geology Bites.
Cordiali saluti,
La Segreteria SGI
In the episode I just released, Alec Brenner of Yale University talks about his recent measurement of relative motion between two ancient cratons in the Paleoarchean. This is a full billion years earlier than any previous such detection. The results enable us to narrow down the kind of tectonics operating 3.5 billion years ago. Of the candidate regimes, episodic subduction models fit his data best.
Given the extreme age of the East Pilbara lavas he sampled, I asked him why we believe he is measuring the originally imprinted magnetic field and not something reflecting all the intervening history. I learned that there's a battery of tests to establish this, and his samples passed them all. I think this is an experimental tour de force with a really significant result. Surprisingly, he explains how his results can also tell us about the state of the Earth's core and atmosphere in the Paleoarchean.
I hope you enjoy listening.
Oliver