Torgeir Andersen, professor emeritus at PHAB, recently appeared on the Geology Bites podcast to discuss the remarkable geological history recorded in western Norway’s eclogites. He explains how the discovery of coesite revealed that these rocks were buried to depths of around 100 km during the collision of Baltica and Laurentia some 400 million years ago, before returning to the surface, and discusses why rare diamond-bearing rocks may reflect local overpressure rather than even greater burial depths.
You can listen to the episode here, or wherever you get your podcasts.