Volatile Changes in Subduction Metamorphism
Explore the fate of volatiles in subduction metamorphism using Mid-ocean ridge basalt (MORB) as a case study. Discover how water content in MORB evolves during subduction, with insights on temperature intervals of water loss and resulting metamorphic facies changes.
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Presentation Transcript
What happens to volatiles during subduction metamorphism? Mid-ocean ridge basalt (MORB)
Water content of MORB during subduction MORB starts with 5 wt.% H2O Thermodynamic model - mineral reactions during subduction are determined and for each reaction, water loss is determined. The colors on the graph indicate the amount of H2O remaining in the rock. The white lines represent different subduction geothermal gradients one hot and one cold (modified from Hacker 2008)
Water content of MORB during subduction The white lines represent different subduction geothermal gradients one hot and one cold Hot = young lithosphere, slow subduction Cold = old lithosphere, fast subduction (modified from Hacker 2008)
Water content of MORB during subduction Trace the hot subduction geotherm. What happens to the water content? Over what temperature interval is half the initial water lost? almost all? What change in metamorphic facies occurs around the water loss? (modified from Hacker 2008)
