PlanetGeo: The Geology Podcast

The Geology of Iridium, The Meteorite Tracker

February 10, 2022 Chris and Jesse Season 2 Episode 2
PlanetGeo: The Geology Podcast
The Geology of Iridium, The Meteorite Tracker
Show Notes

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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