Session Dinner

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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)

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Challenges to Plume and Plate Telling it like
it is

• Gillian R. Foulger University of Durham, UK

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Definition of a plume

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• 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)

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Comparison with geosynclines

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• Mio-geosyncline
• Eu-geosyncline
• Ortho-geosyncline
• Primary geosyncline
• Zeugo-geosyncline
• Para-geosyncline
• Exo-geosyncline
• Taphro-geosyncline
• Paralia-geosyncline

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Basic observations

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• Large amounts of compositionally distinct magma

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Composition

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• The bottom line
• Geochemistry (FOZO, C, PHEM etc.) does NOT
  require a lower-mantle source

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Volume

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

The primary observable But it often cannot be
explained by plumes, or other mechanisms
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Volume

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

Cordery et al. (1997)
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Volume

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

Van Wijk, 2001
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Temperature

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• Are hot spots hot?
• What evidence is there for high T?
• Petrology?
• Seismology?

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Temperature

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

Herzberg et al., 2007
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Temperature

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

Korenaga, 2004
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Seismic tomography

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

How can it help us? Can it help us?

• Major problems
• Repeatability poor
• Poor data coverage globally
• Interpretation ambiguous

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Seismology

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

Comment of van der Hilst de Hoop (2005) on
plumes identified by banana-doughnut
tomography
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Seismology

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• Velocity dependent on
• Phase (mineral or state)
• Composition
• Temperature

RED HOT
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Summary

• Definition of plume
• Composition
• Volume
• Temperature
• Seismology
• Summary

• The bottom line
• Fundamental problems to address
• Lots of methods available
• But serious difficulties that should not be
  ignored

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Thats all folks