The Behavior of Halogens During Subduction-Zone Processes

Barnes, Jaime D.; Manning, Craig E.; Scambelluri, Marco; Selverstone, Jane

doi:10.1007/978-3-319-61667-4_8

Cited by 51 publications

(49 citation statements)

References 209 publications

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“…These data lead to conclude that shallow hydration of Apennine and Alpine mantle rocks took place away from mid ocean ridges, in settings like outer rises, accretionary wedges and shallow forearc (Kendrick et al, 2011(Kendrick et al, , 2013John et al, 2011;Scambelluri & Tonarini, 2012). A contribution of pore fluids to the serpentinizing fluid is also supported by noble gas (He, Ar, Xe; Kendrick et al, 2011) and Cl isotope data (Barnes & Sharp, 2006John et al, 2011;Barnes et al, 2018).…”

Section: Oceanic Serpentinitementioning

confidence: 87%

“…The above issues help constraining (i) element loss to subduction fluids linked to the genesis of arc crust and (ii) the deep recycling into the sources of ocean island basalts. If numerous papers provide evidence that serpentinite delivers water, halogens and FME to arcs (Hattori & Guillot, 2003;Savov et al, 2007;Barnes & Straub, 2010;Deschamps et al, 2010;Scambelluri & Tonarini, 2012;Ryan & Chauvel, 2014;Ribeiro & Lee, 2017;Barnes et al, 2018), a few papers deal with the composition of fluids produced by subduction breakdown of serpentinite (Scambelluri et al, 2001a(Scambelluri et al, , 2004a(Scambelluri et al, , b, 2014Spandler et al, 2014) and only one paper deals with their recycling in the sources of ocean island basalt (OIB) (Kendrick et al, 2017).…”

Section: Serpentinite and Element Recyclingmentioning

confidence: 99%

“…Today, serpentinites are considered as key players in the global volatile cycles in oceans and in subduction zones (Kendrick et al, 2011(Kendrick et al, , 2017Deschamps et al, 2013;Galvez et al, 2013Galvez et al, , 2016Ryan & Chauvel, 2014;Barnes et al, 2018). By transferring C-O-H components to subduction fluids, serpentinites enhance hydration and flux-melting of the supra-subduction mantle wedge and crustal accretion at convergent plate margins, all processes affecting the volatile return to the exosphere and keeping Earth habitable (Hattori & Guillot, 2003, 2007Scambelluri et al, 2004a;Ménez et al, 2012;McCollom & Seewald, 2013).…”

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%

“…Halogens are released in the first 30 km subduction (up to 90% Cl loss) via the chrysotile-to-antigorite transition (Kodolányi & Pettke, 2011). Nevertheless, high-pressure serpentinites exhumed from greater depths still retain appreciable halogen concentrations (Scambelluri et al, 2004a;Bonifacie et al, 2008;John et al, 2011;Kendrick et al, 2011;Selverstone & Sharp, 2013;Barnes et al, 2018). The extent of Cl recycling during serpentinite subduction is shown in Fig.…”

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confidence: 99%

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

Scambelluri

Cannaò

Gilio

2019

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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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