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Proto Melange

Lithium isotopes in Guatemalan and Franciscan HP-LT Rocks: Insights into the role of sediment-derived fluids in the mantle wedge. Kyla Simons, George Harlow, Hannes Brueckner , Steven Goldstein, Sorena Sorensen, N. Gary Hemming, Charles Langmuir. Proto Melange. Oceanic Sediments.

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Proto Melange

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  1. Lithium isotopes in Guatemalan and Franciscan HP-LT Rocks:Insights into the role of sediment-derived fluids in the mantle wedge Kyla Simons, George Harlow, HannesBrueckner, Steven Goldstein, Sorena Sorensen, N. Gary Hemming, Charles Langmuir

  2. Proto Melange Oceanic Sediments Altered Ocean Crust Shear zone between plates Metasomatism of Mantle Wedge After Bebout (2007)

  3. Subduction Fluid Trace Element Patterns

  4. HP-LT Rocks in Guatemala

  5. Physical Model Prograde Oceanic Sediments Altered Ocean Crust Shear zone between plates Dehydration ofSlab Metasomatism of Mantle Wedge

  6. Physical Model Retrograde Oceanic Sediments Altered Ocean Crust Shear zone between plates Dehydration ofSlab Metasomatism of Mantle Wedge

  7. Eclogites Eclogite • South have lawsonite  cold and wet @ peak conditions (~480°C) • Very high pressure rocks just shy of coesite (UHP) field • North saw slightly higher-T (<550°C) with a second metamorphic event Blueschist Jadeitite Jadeitites Jadeitite • Appear to follow down-pressure trend from associated Lws-eclogites and blueschist-eclogites • South contains qtz  higher P. • South T ≥ 200°C. • North T = 300-400°C

  8. Li systematics in Guatemala IAB MORB Guatemala Eclogite Avg.

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