Intragalactic Geology - Dr. Chris Kirkland, Geologist, Curtin University

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.   

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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.
      

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