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Session Dinner

Tonight, join us for a delightful dinner at Zur Alten Kaisermühle by the Alte Donau at 7:45 PM. We will depart from Room 24 at 7:15 PM. Payment is by cash only—credit cards are not accepted. Enjoy an engaging discussion by Gillian R. Foulger from the University of Durham on the complexities of geological plumes, covering their composition, volume, temperature, and seismology. This will provide valuable insights into the definition of geophysical plumes and their significance in geology.

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Session Dinner

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  1. Session Dinner Zur Alten Kaisermühle Restaurant, Alte Donau, Fischerstrand 21A 7.45 pm tonight Payment: Cash at the restaurant (no credit cards) Meeting point: We will set off for the restaurant at 7.15 pm from this room (24)

  2. Challenges to Plume and Plate – Telling it like it is Gillian R. Foulger University of Durham, UK

  3. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Definition of a “plume” • fossil plume (Rotolo et al., 2006) • dying plume (Davaille & Vatteville, 2005) • recycled plume head (Gasperini et al., 2000) • tabular plume (Hoernle et al., 1995) • finger-like plume (Cadoux et al., 2007) • baby plume (Ritter, 2006) • channelled plume (Oyarzun et al, 1997) • toroidal plume (Mahoney et al., 1992) • head-free plume (Ritter, 2006) • cold plume (Hanguita & Hernan, 2000) • depleted residual plume (Danyushevsky et al., 1995) • pulsating plume (Krienitz et al., 2007) • subduction fluid-fluxed refractory plume (Falloon et al., 2007)

  4. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Comparison with geosynclines • Mio-geosyncline • Eu-geosyncline • Ortho-geosyncline • Primary geosyncline • Zeugo-geosyncline • Para-geosyncline • Exo-geosyncline • Taphro-geosyncline • Paralia-geosyncline

  5. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Basic observations Large amounts of compositionally distinct magma

  6. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Composition The bottom line: Geochemistry (FOZO, C, PHEM etc.) does NOT require a lower-mantle source

  7. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Volume The primary observable But it often cannot be explained – by plumes, or other mechanisms

  8. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Volume Cordery et al. (1997)

  9. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Volume Van Wijk, 2001

  10. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Temperature Are “hot spots” hot? What evidence is there for high T? Petrology? Seismology?

  11. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Temperature Herzberg et al., 2007

  12. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Temperature Korenaga, 2004

  13. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Seismic tomography How can it help us? Can it help us? • Major problems: • Repeatability poor • Poor data coverage globally • Interpretation ambiguous

  14. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Seismology Comment of van der Hilst & de Hoop (2005) on “plumes” identified by “banana-doughnut tomography”

  15. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Seismology • Velocity dependent on: • Phase (mineral or state) • Composition • Temperature RED= HOT

  16. Definition of “plume” • Composition • Volume • Temperature • Seismology • Summary Summary The bottom line: Fundamental problems to address Lots of methods available But serious difficulties that should not be ignored

  17. That’s all folks

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