Carissimi Associati SGI,
Carissimi Soci Società Associate,
su indicazione di 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):
Diamonds from the Deep Mantle - Evan Smith (Senior Research Scientist at the Gemological Institute of America, New York.)
Di seguito troverete il messaggio dell'ideatore, Oliver Strimpel, e il link al sito web di Geology Bites.
Cordiali saluti,
La Segreteria
Hello, listeners,
Today I posted an episode with Evan Smith, a senior researcher at the Gemological Institute of America. We discuss a newly identified class of deep-mantle diamonds that are serving as messengers from the lower mantle transition zone at depths of about 650 km. Although these diamonds can command market prices in the million-dollar range, Smith has access to them when they come through his institute for grading. He can even do some destructive testing on their inclusions because, while these are the most valuable bits for science, they are unwanted blemishes in a cut and polished diamond. In the podcast, he tells us that isotopic analysis of the inclusions reveals an unequivocal connection to subducted slabs. And he and his coworkers also found an unexpected phase out of which the diamond formed — liquid metal consisting mainly of iron and nickel. How this forms and how diamond forms from it are puzzles he is working on today.
I hope you enjoy listening.
Oliver
geologybites.com
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