proto melange
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Lithium isotopes in Guatemalan and Franciscan HP-LT Rocks:
Insights into the role of sediment-derived fluids in the mantle wedge
![Page 2: Proto Melange](https://reader036.vdocuments.mx/reader036/viewer/2022062301/56813a28550346895da20c91/html5/thumbnails/2.jpg)
Proto Melange
Shear zone between plates
Altered Ocean Crust
Oceanic Sediments
After Bebout (2007)
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Subduction Fluid Trace Element Patterns
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HP-LT Rocks in Guatemala
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Dehydra
tion of Slab
Shear zone between plates
Altered Ocean Crust
Oceanic Sediments
Physical Model Prograde
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Physical Model Retrograde
Dehydra
tion of Slab
Shear zone between plates
Altered Ocean Crust
Oceanic Sediments
![Page 8: Proto Melange](https://reader036.vdocuments.mx/reader036/viewer/2022062301/56813a28550346895da20c91/html5/thumbnails/8.jpg)
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
Eclogites
JadeititesAppear 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
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Li systematics in Guatemala
MORBIAB
Guatemala Eclogite Avg.