Carmie Garzione on Reconstructing Land Elevation Over Geological Time
Listen now
Throughout geological history, various points on the Earth’s surface have been lifted up to great elevations and worn down into low, flat-lying regions.  Determining surface elevation histories is difficult because rocks that were once on the surface are usually eroded away or buried.  Furthermore, most rock-forming processes are not directly affected by elevation.  But it turns out that we can overcome these challenges, as Carmie Garzione explains in the podcast.  Carmie Garzione is Dean of the College of Science at the University of Arizona.  She has managed to pin down the history of elevation changes by analyzing stable isotopes of carbon and oxygen in carbonate rocks.  She describes how the method works, and presents her findings for the Tibetan plateau and the Andes.  They show pulses of very rapid (geologically speaking) uplift.  What might this be telling us about what has been going on in the lower crust and upper mantle in these regions?
More Episodes
Complex life did not start in the Cambrian - it was there in the Ediacaran, the period that preceded the Cambrian. And the physical and chemical environment that prevailed in the early to middle Cambrian may well have arisen at earlier times in Earth history. So what exactly was the Cambrian...
Published 06/08/24
Published 06/08/24
Jupiter's innermost Galilean moon, Io, is peppered with volcanos that are erupting almost all the time. In this episode, Scott Bolton, Principal Investigator of NASA's Juno mission to Jupiter, describes what we're learning from this space probe. Since its arrival in 2017, its orbit around...
Published 05/25/24