How, Why and Where Earth Melts

  • 27 Feb 2024
  • 5:30 PM
  • Online and in-person at Bridge 99 Brewery

Dana Johnston

University of Oregon

Watch the recorded presentation

5:30 pm social hour

7:00 pm presentation

A common misconception is that magmatism within our planet results from a thermal anomaly of some sort, causing a local perturbation in the geotherm. While this is sometimes the case, the vast majority of magmatic activity in fact results from decompression of hot rocks or lowering their solidus temperature through the introduction of fluxing agents, principally H2O. The former dominates at mid-ocean ridges, oceanic and continental hot spots and continental rifts while the latter dominates at subduction zones. Much of our knowledge of these processes derives from experimental petrologic studies at elevated pressures and I will show how such investigations shed light on these mechanisms through which our planet differentiates.

Please join us at Bridge 99 Brewery:

63063 Layton Avenue, Bend

5:30 pm social hour

7:00 pm presentation

COGS talk are free and open to the public -- all are welcome! Please join us for the social hour before the presentation.

All presentations are also live-streamed through Zoom. There will be a registration link at the top of this page as we get closer to the date of this presentation.

Central Oregon Geoscience Society

P.O. Box 2154,  Bend, Oregon 97709

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