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Petrologic Constraints on Mantle Temperature and Water Content

Petrologic Constraints on Mantle Temperature and Water Content. Marc Hirschmann University of Minnesota. Stixrude&Lithgow-Bertelloni, 2005. Stixrude&Lithgow-Bertelloni, 2005. Oceanic Crust Production Langmuir et al., 1992; Asimow et al., 2001. Trace amounts of H 2 O enhance melting….

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Petrologic Constraints on Mantle Temperature and Water Content

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  1. Petrologic Constraints on Mantle Temperature and Water Content Marc Hirschmann University of Minnesota

  2. Stixrude&Lithgow-Bertelloni, 2005

  3. Stixrude&Lithgow-Bertelloni, 2005

  4. Oceanic Crust Production Langmuir et al., 1992; Asimow et al., 2001

  5. Trace amounts of H2O enhance melting…. Hirth & Kohlstedt, 1996; Asimow & Langmuir, 2003

  6. Saal et al., 2002 MORB and seamount glasses Easter Microplate CO2 (wt.%) Kingley et al. 2002 H2O (wt.%)

  7. H2O Storage Capacity

  8. Hirth & Kohlstedt, 1996

  9. Aubaud et al., GRL, 2004

  10. Hirth & Kohlstedt, 1996 Aubaud et al., GRL, 2004

  11. MELT Experiment beneath EPR Gu et al. (2005) The MELT Seismic Team (1998)

  12. Dasgupta & Hirschmann (2006) - Nature

  13. Carbonated Melt Catalyzes Grain Growth Supersolidus Subsolidus Dasgupta et al., 2004 Dasgupta et al. (2004) - EPSL

  14. Dasgupta & Hirschmann (2006) - Nature

  15. Origin of Chemical Lithosphere and Volatile induced Melting of Peridotite Hirth & Kohlstedt (1996) Aubaud et al., 2004 Peridotite Dehydration is aided by Partial Melting

  16. Dasgupta & Hirschmann (2006) - Nature

  17. Deep Carbonated Silicate Melting Beneath Ridges Transition from carbonatite to carbonated silicate melts at 3 GPa Silicate Melting is enhanced in presence of carbonate Dasgupta & Hirschmann (submitted)

  18. Deep Carbonated Silicate Melting & H2O Extraction Beneath Ridges

  19. Schmidt+Poli, 1998

  20. Honshu - Van Keken, 2003

  21. (from Gaetani+Grove, 2003)

  22. Tim Grove - unpublished results (thanks, Tim!)

  23. High Temperature Melt or Fluid Transfer from the Slab Elliott, 2003

  24. Kelemen et al. 2003

  25. Davies&Stevenson, 1992 Mibe et al., 2001

  26. Temperatures at the base of the crust based on metamorphic thermobarometry Kelemen et al., 2003

  27. Mt. Shasta-Medicine Lake (Elkins Tanton et al., 2001)

  28. Thanks for listening…..

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