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- W1616366871 abstract "Serpentinized subarc mantle peridotites act as an important sink for Li and B. These mobile light elements are carried by H2O-rich fluids released from the downgoing Pacific slab during subduction. We studied variably serpentinized harzburgite clasts recovered after drilling in the forearc region of the Mariana arc-basin system (ODP Leg 195, Site 1200). Our goal was to determine the course of serpentinization by studying various textural features and their B and Li signatures. Slab dehydration and the resulting serpentinization of the overlaying mantle wedge is not a sudden process but rather a series of stepwise reaction fronts fed by separate fluid pulses through the rock. These fluid pulses have changing, constantly evolving composition and thus form different serpentine types and could even react with already serpentinized rock. We measured the Li and B concentration in different textural types (e.g. veins, mesh rims and centers) of serpentine on a 5 μm scale by SIMS and identified the specific serpentine polymorphs of these textures by Raman spectroscopy. Lizardite appears to be the dominant serpentine polymorph in all textural types. The textures in serpentinite clasts with relict primary minerals (e.g. OL and PX) can be correlated with distinct Li and B concentrations. Serpentinization begins with fracturefilling veins and the formation of mesh rims replacing olivine. For instance, an early broad vein shows an evolution from high B (up to 90μg/g) and Li (>10μg/g) content in the rim zone towards lower B (~55μg/g) and Li (>0.4μg/g) values in the veins central part. Thus, the initial slab fluids were highly enriched in light elements that were incorporated into the first generation serpentines. The first generation mesh rims have variable B concentrations, but also high Li (>10μg/g) contents. To the contrary, late-stage mesh centers and late (often brucite-rich) thin veins record the lowest Li contents (down to ~0.1μg/g) and low B contents (<10μg/g). Our data reveal that serpentinizing fluids in the mantle wedge change their composition. Such changes may have a massive influence on the style and extent of the Li and B forearc outfluxes. We conclude that serpentinization of the mantle wedge is very heterogeneous on all scales. Weathering rates: A hydrological approach F.A.L. PACHECO AND C.H. VAN DER WEIJDEN UTAD, Vila Real, Portugal (fpacheco@utad.pt) Utrecht University, The Netherlands (chvdw@geo.uu.nl)" @default.
- W1616366871 created "2016-06-24" @default.
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- W1616366871 date "2008-07-01" @default.
- W1616366871 modified "2023-09-26" @default.
- W1616366871 title "B- and Li-rich fluid pulses in the Mariana mantle wedge" @default.
- W1616366871 hasPublicationYear "2008" @default.
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