Linking serpentinite geochemistry with tectonic evolution at the subduction plate-interface: The Voltri Massif case study (Ligurian Western Alps, Italy)

Cannaò, Enrico; Scambelluri, Marco; Agostini, Samuele; Tonarini, S.; Godard, Marguerite

doi:10.1016/j.gca.2016.06.034

Cited by 65 publications

(75 citation statements)

References 108 publications

(22 reference statements)

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“…Extensional tectonics drives the near-surface exposure of the lithospheric mantle and enables low-temperature hydration of mantle peridotites by infiltrating ocean water. In subduction zones, large slices of serpentinized oceanic mantle can accrete to the boundaries between converging plates (Angiboust et al, 2012;Cannaò et al, 2016): this, together with forearc mantle hydration by uprising slab fluids, makes serpentinite a main lithology affecting behaviour of the subduction interface (Reynard, 2013). Therefore, the interplay between fluids and tectonics enhances mantle serpentinization in key geodynamic environments, weakens the intra-plate boundary structures and significantly impacts global tectonics.…”

Section: Serpentinite Occurrence In Modern Geodynamic Settingsmentioning

confidence: 99%

“…Great relevance is now given to the subduction plate interface ( Fig. 1c) where deformation, fluid and mass flow are channelized, and the buoyant uplift of high-(HP) and ultrahigh-pressure (UHP) rocks occurs (Hermann et al, 2000;Schwartz et al, 2001;Gerya et al, 2002;Hyndman & Peacock, 2003;Bebout, 2007;Angiboust et al, 2012;Cannaò et al, 2016;Bebout & Penniston-Dorland, 2016;Sievers et al, 2017). In such environments serpentinite can: (i) be part of tectonic mélanges atop the slab (Bebout, 2007); (ii) be the main lithology in kilometric slices of oceanic lithosphere detached from subducting slabs (Garrido et al, 2005;Angiboust et al, 2012); (iii) derive from hydration of forearc mantle (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In the petrologic and geochemical perspective, serpentinites are major repositories of water, halogens, FMEs and noble gases acquired during oceanic alteration and by interaction with subduction fluids (Straub & Layne, 2003;Scambelluri et al, 2004a, b;Barnes & Straub, 2010;Kodolányi et al, 2012;Kendrick et al, 2013;Cannaò et al, 2016;Barnes et al, 2018). Once stored in serpentinite, these elements are released by prograde dehydration reactions (Hattori & Guillot, 2003;Kendrick et al, 2011;Kodolányi & Pettke, 2011;John et al, 2011;Deschamps et al, 2013;Scambelluri et al, 2015a).…”

Section: Introductionmentioning

confidence: 99%

“…Tatsumi, 1986;Hyndman & Peacock, 2003;Savov et al, 2005aSavov et al, , 2007Gerya et al, 2006;Marschall & Schumacher, 2012;Ryan & Chauvel, 2014;Nielsen & Marschall, 2017;Ribeiro & Lee, 2017). The serpentinite capability of recording multiple interaction events with external fluids, as evidenced by increasing FME budgets and partial to complete reset of their isotopic signatures (Sr, Pb, O, Cl, B) makes this rock-type helpful to trace element recycling into the mantle and to unravel the evolution of exhumed HP-UHP terrains (Deschamps et al, 2010;Barnes et al, 2014;Cannaò et al, 2015Cannaò et al, , 2016Scambelluri et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

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The water and fluid-mobile element cycles during serpentinite subduction. A review

Scambelluri

Cannaò

Gilio

2019

ejm

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The key role of serpentinites in the global cycles of volatiles, halogens and fluid-mobile elements in oceans and in subduction zones is now ascertained by many studies quantifying their element budgets and the composition of fluids they release during subduction. Geochemical tracers (e.g. B, As, Sb; stable B and radiogenic Sr and Pb isotopes) have also been employed to trace the provenance of serpentinites (slab or forearc mantle?) accreted to the plate interface of fossil subduction zones. In turn, this helps defining the tectonic processes, seismicity and mass transfer attending rock burial and exhumation within subduction zones. The results suggest that the sole use of geochemical data is insufficient to track the origin of subduction-zone serpentinites and the timing of serpentinization, whether oceanic or subduction-related. Integrated multidisciplinary studies of ophiolitic serpentinites show that pristine, oceanic, geochemical imprints (e.g. high 11 B, marine Sr isotopes, low As + Sb) become reset towards more radiogenic Sr, lower 11 B, and higher As + Sb via metasomatic exchange with crust-derived fluids during subduction accretion to the plate interface.The dehydration fluids released by serpentinite dehydration at various subduction stages and still preserved in these rocks as inclusions, carry significant amounts of halogens and fluid-mobile elements. The key compositional similarities of antigorite-breakdown fluids from different localities (Betic Cordillera, Spain; Central Alps, Switzerland) indicate that rocks record comparable subduction processes. We individuate the fluid-mediated exchange with sedimentary and/or crustal reservoirs during subduction as the key mechanism for geochemical hybridization of serpentinite. The antigorite dehydration fluids produced by hybrid serpentinites have high Cs, Rb, Ba, B, Pb, As, Sb and Li overlapping those of the arc lavas and representing the mixed serpentinite-sediment (crustal) component released to arcs. This helps discriminating the mass transfer processes responsible for supra-subduction mantle metasomatism and arc magmatism. The studied plate-interface hybrid serpentinites are also proxies of forearc mantle metasomatized by slab fluids. Based on the above observations, we propose that the mass transfer from slabs to plate interface and/or forearc mantle and the subsequent down-drag of this altered mantle to subarc depths potentially is a major process operating in subduction zones.The nominally anhydrous olivine, orhopyroxene, clinopyroxene and garnet produced by serpentinite dehydration host appreciable amounts of halogens and fluid-mobile elements that can be recycled in the deep mantle beyond arcs. Involvement of de-serpentinized residues in lower mantle metasomatism begins to be increasingly recognized by studies of ocean island basalts (OIB) and of B-bearing blue diamonds and by the isotopic serpentinite compositions presented here.

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Section: Serpentinite Occurrence In Modern Geodynamic Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The water and fluid-mobile element cycles during serpentinite subduction. A review

Scambelluri

Cannaò

Gilio

2019

ejm

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“…, Cannaò et al . ). Fluids percolating through the mantle wedge are, in turn, recycled back into the crust by the partial melting responsible for arc magmatism (e.g., Hattori and Guillot , Deschamps et al .…”

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confidence: 97%

In Situ Oxygen Isotope Determination in Serpentine Minerals by Ion Microprobe: Reference Materials and Applications to Ultrahigh‐Pressure Serpentinites

Scicchitano

Rubatto

Hermann

et al. 2018

Geostandard Geoanalytic Res

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We present the first investigation of in situ oxygen isotopes in serpentine minerals by sensitive high‐resolution ion microprobe (SHRIMP). Chemically homogeneous samples of antigorite (δ18O = 8.30 ± 0.12‰), chrysotile (δ18O = 4.37 ± 0.02‰) and lizardite (δ18O = 5.26 ± 0.20‰) analysed by laser fluorination are identified as potential reference materials. They were analysed by SHRIMP to assess their homogeneity compared with the San Carlos olivine, as well as for potential matrix bias and crystal orientation effects. The reproducibility achieved for all samples was ± 0.30–0.55‰ (95% confidence level). Matrix bias between antigorite/olivine and antigorite/lizardite was up to ~ +3‰ and −1‰, respectively. Crystal orientation effects were identified only in chrysotile, and no matrix bias was observed over the investigated compositional range within each serpentine mineral. The new reference materials were used to measure the oxygen isotope composition of serpentines in an ultrahigh‐pressure metamorphic belt from Tianshan (China). By combining oxygen isotopes and trace element microanalyses, several stages of serpentinisation were recognised: (a) seafloor alteration, (b) recycling of internal metamorphic fluids during isothermal decompression and (c) shallow interaction with meteoric water during exhumation. No interaction with fluids derived from the surrounding metapelites during subduction was identified.

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Boron Isotopes as a Tracer of Subduction Zone Processes

Hoog

Savov

2017

Advances in Isotope Geochemistry

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Linking serpentinite geochemistry with tectonic evolution at the subduction plate-interface: The Voltri Massif case study (Ligurian Western Alps, Italy)

Cited by 65 publications

References 108 publications

The water and fluid-mobile element cycles during serpentinite subduction. A review

The water and fluid-mobile element cycles during serpentinite subduction. A review

In Situ Oxygen Isotope Determination in Serpentine Minerals by Ion Microprobe: Reference Materials and Applications to Ultrahigh‐Pressure Serpentinites

Boron Isotopes as a Tracer of Subduction Zone Processes

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