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Session Dinner

Session Dinner. Zur Alten Kaiserm ü hle 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). Challenges to Plume and Plate – Telling it like it is.

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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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