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- W3024775526 abstract "Subduction zones are the primary areas of chemical andmass transfer between the Earth’s surface and the mantle.Dehydration during subduction has been linked to subductionseismicity, arc volcanism, and redox (fO2) changes in thesubducting slab and overlying mantle wedge. Despite this, nopetrologic record tracing the source of oxidizing fluids from thedown going slab has yet been observed. To address this, this studyshows a direct record of progressive redox change recorded in zonedgarnet crystals from Sifnos and Syros, Greece that grew through thebreakdown of the hydrous mineral lawsonite during subduction.Oxygen fugacities (fO2) calculated using garnet-epidoteoxybarometry for multiple growth zones within single garnet grainshave been compared with stable iron isotope compositions in thesame growth zone. These combined measurements reveal that garnetcores grew under oxidized conditions, recording higher fO2 andlower 56Fe values, whereas garnet rims grew under more reducedconditions with lower fO2 and higher 56Fe values. This isconsistent with the release of oxidizing fluids into the sub-arcmantle accompanying lawsonite breakdown and dehydration, leavingbehind a progressively reduced residual slab mineral assemblage.These coupled fO2 and Fe isotope data show that slab dehydrationaccompanying lawsonite breakdown plays an important and measureablerole in the global redox budget, and provides a mechanism forsub-arc mantle oxidation." @default.
- W3024775526 created "2020-05-21" @default.
- W3024775526 creator A5071284590 @default.
- W3024775526 date "2018-01-01" @default.
- W3024775526 modified "2023-09-27" @default.
- W3024775526 title "Tracing the source of oxidizing fluids in subduction zones using iron isotopes in garnet" @default.
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