The Geology of Iridium, The Meteorite Tracker

PlanetGeo: The Geology Podcast

In this episode, Jesse and Chris follow up on the K-T Extinction episode from last week. Why is Iridium so important in this story? Our show notes summary is below.
Why is Iridium identified in these layers?

• Well, it’s higher in meteorites - but not really high.
• Why is it higher in meteorites though?
  • It’s not actually high in meteorites, it’s low in the Earth’s crust! Very very very low.
• Yet, Earth is made of meteorites, so where did the Ir go?
  • Most of it is in the core and we talk about why.
• Very rare on the surface of the Earth - only three metric tons mined and used yearly
  • The most corrosion resistant substance known - even at high temperatures
  • If it's so corrosion resistant, what is it used for?

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Instagram: @planetgeocast
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Email: [e-mail]
Website: https://planetgeocast.com/