Channelized Fluid Flow and Eclogite-facies Metasomatism along the Subduction Shear Zone

Angiboust, Samuel; Pettke, Thomas; Hoog, Jan C.M. De; Caron, B.; Oncken, Onno

doi:10.1093/petrology/egu010

Cited by 156 publications

(163 citation statements)

References 136 publications

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“…The extent of these discrepancies, in particular for Ca and Mg, calls for dedicated experimental characterization and/or first-principles MD simulation of the stoichiometric, charge and thermochemical properties of these species. This would be a decisive step toward the accurate quantification of the interactions between compositionally variable lithologies (e.g., Konrad-Schmolke et al, 2011;Galvez et al, 2013b;Marchesi et al, 2013;Angiboust et al, 2014) and complex aqueous solutions associated to deep Earth metasomatism, while preserving a physically realistic model of fluid speciation.…”

Section: Resultsmentioning

confidence: 99%

The solubility of rocks in metamorphic fluids: A model for rock-dominated conditions to upper mantle pressure and temperature

Gálvez

Manning

Connolly

et al. 2015

Earth and Planetary Science Letters

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Section: Resultsmentioning

confidence: 99%

The solubility of rocks in metamorphic fluids: A model for rock-dominated conditions to upper mantle pressure and temperature

Gálvez

Manning

Connolly

et al. 2015

Earth and Planetary Science Letters

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“…Henry et al, 1996;Cartwright and Buick, 2000;Cartwright and Barnicoat, 2003). As an additional possibility, infiltration of these subducting sediments by fluids generated by devolatilization in underlying mafic mineralogies (δ 18 O = +6 to +20‰; Alt et al, 1992) could have caused this shift (see Angiboust et al, 2014, for a discussion of fluid sources for the Monviso locality). However, no evidence has been found that would require this more complicated mechanism for the bulk of the Schistes Lustrés.…”

Section: Oxygen Isotope Evidence For Infiltration Of Carbonate-rich Lmentioning

confidence: 99%

Subduction zone metamorphic pathway for deep carbon cycling: I. Evidence from HP/UHP metasedimentary rocks, Italian Alps

Cook-Kollars¹,

Bebout²,

Collins³

et al. 2014

Chemical Geology

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105

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“…Exchange with surrounding sedimentary rocks can cause serpentinite enrichment in specific tracers like As, Be, Sb, B, radiogenic Sr, Pb and isotopically light B (Hattori and Guillot, 2003;Marchesi et al, 2013;Harvey et al, 2014;Scambelluri et al, 2014;Angiboust et al, 2014;Lafay et al, 2013;Cannaò et al, 2015). Element addition to serpentinite may occur during prograde burial (Deschamps et al, 2011;Scambelluri et al, 2014), or during fluid channeling along shear zones in subducting slabs (Angiboust et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Element addition to serpentinite may occur during prograde burial (Deschamps et al, 2011;Scambelluri et al, 2014), or during fluid channeling along shear zones in subducting slabs (Angiboust et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Fluid-related inclusions in Alpine high-pressure peridotite reveal trace element recycling during subduction-zone dehydration of serpentinized mantle (Cima di Gagnone, Swiss Alps)

Scambelluri

Pettke

Cannaò

2015

Earth and Planetary Science Letters

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104

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Available online xxxx Editor: T.A. Mather Keywords: serpentinized mantle garnet peridotite chlorite harzburgite polyphase inclusions subduction fluids fluid-mobile elementsSerpentinites release at sub-arc depths volatiles and several fluid-mobile trace elements found in arc magmas. Constraining element uptake in these rocks and defining the trace element composition of fluids released upon serpentinite dehydration can improve our understanding of mass transfer across subduction zones and to volcanic arcs. The eclogite-facies garnet metaperidotite and chlorite harzburgite bodies embedded in paragneiss of the subduction melange from Cima di Gagnone derive from serpentinized peridotite protoliths and are unique examples of ultramafic rocks that experienced subduction metasomatism and devolatilization. In these rocks, metamorphic olivine and garnet trap polyphase inclusions representing the fluid released during high-pressure breakdown of antigorite and chlorite. Combining major element mapping and laser-ablation ICP-MS bulk inclusion analysis, we characterize the mineral content of polyphase inclusions and quantify the fluid composition. Silicates, Cl-bearing phases, sulphides, carbonates, and oxides document post-entrapment mineral growth in the inclusions starting immediately after fluid entrapment. Compositional data reveal the presence of two different fluid types. The first (type A) records a fluid prominently enriched in fluid-mobile elements, with Cl, Cs, Pb, As, Sb concentrations up to 10 3 PM (primitive mantle), ∼10 2 PM Tl, Ba, while Rb, B, Sr, Li, U concentrations are of the order of 10 1 PM, and alkalis are ∼2 PM. The second fluid (type B) has considerably lower fluid-mobile element enrichments, but its enrichment patterns are comparable to type A fluid. Our data reveal multistage fluid uptake in these peridotite bodies, including selective element enrichment during seafloor alteration, followed by fluid-rock interaction along with subduction metamorphism in the plate interface melange. Here, infiltration of sediment-equilibrated fluid produced significant enrichment of the serpentinites in As, Sb, B, Pb, an enriched trace element pattern that was then transferred to the fluid released at greater depth upon serpentine dehydration (type A fluid). The type B fluid hosted by garnet may record the composition of the chlorite breakdown fluid released at even greater depth. The Gagnone study-case demonstrates that serpentinized peridotites acquire water and fluid-mobile elements during ocean floor hydration and through exchange with sediment-equilibrated fluids in the early subduction stages. Subsequent antigorite devolatilization at subarc depths delivers aqueous fluids to the mantle wedge that can be prominently enriched in sediment-derived components, potentially triggering arc magmatism without the need of concomitant dehydration/melting of metasediments or altered oceanic crust.

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Channelized Fluid Flow and Eclogite-facies Metasomatism along the Subduction Shear Zone

Cited by 156 publications

References 136 publications

The solubility of rocks in metamorphic fluids: A model for rock-dominated conditions to upper mantle pressure and temperature

The solubility of rocks in metamorphic fluids: A model for rock-dominated conditions to upper mantle pressure and temperature

Subduction zone metamorphic pathway for deep carbon cycling: I. Evidence from HP/UHP metasedimentary rocks, Italian Alps

Fluid-related inclusions in Alpine high-pressure peridotite reveal trace element recycling during subduction-zone dehydration of serpentinized mantle (Cima di Gagnone, Swiss Alps)

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