Torgeir Andersen on Ultrahigh-Pressure Metamorphism

Torgeir Andersen explains how continental rocks in western Norway were dragged roughly 100 kilometres into the mantle during the collision of Baltica and Laurentia, and then returned to the surface. Coesite inclusions provide evidence of ultrahigh-pressure metamorphism. The conversation examines subduction, slab break-off, exhumation and whether isolated diamond-bearing rocks record local overpressure rather than greater burial depth.