Is Earth's crustal formation influenced by its position in the galaxy? And how would we know? It's obvious there are many celestial cycles, from the earthly ones that Milankovitch described to the orbit of the solar system through the galaxy, but how can we tie those to geological planetary cycles, like the 800 m.y. resonance of the core, the 500-300 m.y. supercontinent cycle, and the ~ 30 m.y. impact cycle? Professor Chris Kirkland and team from Australia's Curtin University have developed a zircon-based approach that they say can tease apart the cyclic secrets of crust formation. We talk radiometric dating, limits and benefits of the technique, asymptotic time horizons, and the difficulties of doing geology on a galactic scale. Support the scientific revolution with a monthly donation: https://bit.ly/3lcAasB Let us know what you think of the presentation in the comments! 00:00 Go! 00:06:33 How does radiometric dating work? 00:09:41 A series of critical assumptions 00:15:26 What are ways the clocks can get messed up? 00:23:49 Why does everything converge on 4.5 billion years? 00:29:47 Is everything that comes out of a volcano the same age? 00:33:30 More about picking zircons 00:40:33 Where are the zircons being made? 00:44:22 Geology is about stories 00:50:54 Galactic influence on the Early Earth? 00:57:09 What were the patterns that served as the starting point? 00:59:23 Were there other candidates that weren't the galaxy? 01:07:55 A Historical perspective 01:12:24 A history of giant impacts 01:17:53 Archean greenstones and the metallogenic epochs 01:23:13 Ringwoodite, decompression, and early oceans #geology #astronomy #physics Check our short-films channel, @DemystifySci: https://www.youtube.com/c/DemystifyingScience Join our mailing list https://bit.ly/3v3kz2S PODCAST INFO: Anastasia completed her PhD studying microbial communication at Columbia University. When not talking to brilliant people or making movies, she spends her time painting and exploring the woods. Michael Shilo also did his PhD at Columbia studying the elastic properties of molecular water. When he's not in the film studio, he's exploring sound in music. They are both freelance professors at various universities. - Blog: http://DemystifySci.com/blog - RSS: https://anchor.fm/s/2be66934/podcast/rss - Donate: https://bit.ly/3wkPqaD - Swag: https://bit.ly/2PXdC2y SOCIAL: - Discord: https://discord.gg/MJzKT8CQub - Facebook: https://www.facebook.com/groups/DemystifySci - Instagram: https://www.instagram.com/DemystifySci/ - Twitter: https://twitter.com/DemystifySci MUSIC: -Shilo Delay: https://g.co/kgs/oty671