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• W1965656370 endingPage "22" @default.
• W1965656370 startingPage "9" @default.
• W1965656370 abstract "We present a method to reconstruct the dehydration flux associated with garnet-forming reactions during subduction . Garnet-bearing blueschists from the island of Sifnos, Greece, in the Attic–Cycladic Blueschist Belt are used as a test case to extract information on the timescales of dehydration during subduction. We use garnet growth as a proxy for the net dehydration reaction. Thermodynamic (pseudosection) analysis of a mafic blueschist in this unit (representative of an altered basalt protolith) indicates that garnet grew via net reaction(s) of the form chlorite + chloritoid + glaucophane + phengite = garnet + pyroxene + lawsonite + paragonite + quartz + H 2 O. Garnet core and rim chemistry indicates that growth began at 2.0 GPa and 460 °C and ended at 2.2 GPa and 560 °C. The stabilization of matrix lawsonite (promoted by the bulk chemical shift of the matrix due to fractionation of the garnet and its inclusions from the system) throughout garnet growth limits the amount of water liberated from the rock over this P–T span. The average stoichiometry of the garnet-forming reaction(s) indicates an average molar production ratio of garnet to water of ~ 1.0:0.7. Given the 11 vol.% garnet observed in the rock, this analysis indicates a loss of 0.3 to 0.4 wt.% H 2 O from the bulk rock during garnet growth. Zoned garnet geochronology from these rocks provides a constraint on the dehydration rate from this lithology during the time span of garnet growth. Two garnet grains, roughly 1.5 cm each in diameter, were microdrilled based on major element zoning contours. Three concentric growth zones were extracted from each garnet for Sm–Nd geochronology. Very low Nd concentrations in acid-cleansed garnet (0.03 to 0.09 ppm) yielded very small samples (~ 1 ng Nd) that were analyzed with TIMS using a NdO + with Ta 2 O 5 activator method. Untreated “garnet” powders rich in mineral inclusions from each garnet zone were also analyzed. The powders fall off of the garnet-matrix isochron, likely indicating age inheritance in the inclusions. Combining acid-cleansed garnet data from each garnet, multi-point garnet-matrix isochron ages of 46.50 ± 0.80 Ma for the core, 46.49 ± 0.53 Ma for the intermediate zone, and 46.46 ± 0.59 Ma for the rim were determined, indicating a brief growth duration of 0.04 Ma with an upper bound (2 SD) on growth duration of 1.0 Myr. This equates to a release of 0.3–0.4 wt.% of water due to this reaction in this lithology, and heating of 100 °C, in less than 1.0 Myr. The short time interval represents a focused, rapid pulse of dehydration and heating within the context of the overall subduction descent timescale of ~ 10–20 Myr. ► We present a method to reconstruct dehydration rates in subduction zones. ► Garnet growth duration in a Sifnos blueschist was less than one million years. ► Garnet growth spanned 460 °C and 2.0 GPa to 560 °C and 2.2 GPa during subduction. ► 0.3 to 0.4 wt.% water was released during these garnet forming reactions. ► Significant subduction zone dehydration occurred in a rapid pulse on Sifnos." @default.
• W1965656370 created "2016-06-24" @default.
• W1965656370 creator A5043874643 @default.
• W1965656370 creator A5050386353 @default.
• W1965656370 creator A5053076372 @default.
• W1965656370 creator A5076621150 @default.
• W1965656370 date "2012-07-01" @default.
• W1965656370 modified "2023-09-27" @default.
• W1965656370 title "Using garnet to constrain the duration and rate of water-releasing metamorphic reactions during subduction: An example from Sifnos, Greece" @default.
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• W1965656370 doi "https://doi.org/10.1016/j.chemgeo.2012.04.016" @default.
• W1965656370 hasPublicationYear "2012" @default.

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