Fluid-mobile elements in serpentinites: Constraints on serpentinisation environments and element cycling in subduction zones

Peters, Daniel; Bretscher, Annette; John, Timm; Scambelluri, Marco; Pettke, Thomas

doi:10.1016/j.chemgeo.2017.07.017

Cited by 91 publications

(75 citation statements)

References 75 publications

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“…A new approach in interpreting serpentinite compositions has been recently proposed by Peters et al (2017), who show that using U versus alkalis and FME ratios enables distinction between abyssal and subduction-zone serpentinites (Peters et al, 2017). Here we report the Cs/U and Rb/U ratios (Fig.…”

mentioning

confidence: 76%

“…Several review and research papers recently dealt with the role of serpentinite in volatile and FME cycling in oceans and subduction zones Kendrick et al, 2013Kendrick et al, , 2017Ryan & Chauvel, 2014;Peters et al, 2017). Given the widespread occurrence of serpentinite in slabs, plate interface and forearcs, some of these studies have tried to identify geochemical tracers to relocate the exhumed HP-UHP serpentinites into the original subduction setting and to define timing of their accretion to the subduction plate interface (Hattori & Guillot, 2003;Deschamps et al, 2012;Scambelluri & Tonarini, 2012;Lafay et al, 2013;Scambelluri et al, 2014;Cannaò et al, 2016).…”

Section: Serpentinite Compositionsmentioning

confidence: 99%

“…Given the widespread occurrence of serpentinite in slabs, plate interface and forearcs, some of these studies have tried to identify geochemical tracers to relocate the exhumed HP-UHP serpentinites into the original subduction setting and to define timing of their accretion to the subduction plate interface (Hattori & Guillot, 2003;Deschamps et al, 2012;Scambelluri & Tonarini, 2012;Lafay et al, 2013;Scambelluri et al, 2014;Cannaò et al, 2016). Notwithstanding the efforts, the overlap of the trace-element compositions of oceanic (abyssal), forearc and subductionzone serpentinites hampered recognition of the tracer elements enabling to identify unequivocally the original formation setting of a given serpentinite (Peters et al, 2017). A pure geochemical approach can work in specific cases; more generally, integration of geochemistry with field, textural and petrologic data is required.…”

Section: Serpentinite Compositionsmentioning

confidence: 99%

“…Oceanic serpentinites also inherit the REE compositions of their mantle protoliths. Figure 4 reports the trace-element compositions of numerous abyssal serpentinites from the large datasets by Deschamps et al (2013) and Peters et al (2017) normalized to the Primitive Mantle (PM, McDonough & Sun, 1995) (the dataset, in Table S1, includes analyses by Lagabrielle et al, 1992;Parkinson & Pearce, 1998;Viti & Mellini, 1998;Anselmi et al, 2000;Pearce et al, 2000;Guillot et al, 2001;Scambelluri et al, 2001b;Chalot-Prat et al, 2003;Garrido et al, 2005;Savov et al, 2005aSavov et al, , b, 2007Aldanmaz & Koprubasi, 2006;Marchesi et al, 2006Marchesi et al, , 2009Paulick et al, 2006;Hattori & Guillot, 2007;Delacour et al, 2008;Pereira et al, 2008;De Hoog et al, 2009;Deschamps et al, 2010Deschamps et al, , 2012Jöns et al, 2010;Saumur et al, 2010;Ulrich et al, 2010;Aziz et al, 2011;Blanco-Quintero et al, 2011;Augustin et al, 2012;Kodolányi et al, 2012;Boschi et al, 2013;Lafay et al, 2013;Andreani et al, 2014;Cannaò et al, 2015Cannaò et al, , 2016…”

Section: Oceanic Serpentinitementioning

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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mentioning

confidence: 76%

Section: Serpentinite Compositionsmentioning

confidence: 99%

Section: Serpentinite Compositionsmentioning

confidence: 99%

Section: Oceanic Serpentinitementioning

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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“…However, under specific high‐temperature metamorphic, magmatic, and hydrothermal conditions, HFSE and REE also behave similar to other mobile phases (Gieré, ; Ordóñez‐Calderón et al, ; Tilley & Eggleton, ; Valsami‐Jones, ). In addition, the interaction of the seawater with the mafic and ultramafic rocks also results in the enrichment of LILE, LREE, and prominent positive Eu anomalies in the chondrite‐normalized REE diagrams (Kodolányi, Pettke, Spandler, Kamber, & Ling, ; Marchesi, Garrido, Padrón‐Navarta, López Sánchez‐Vizcaíno, & Gómez‐Pugnaire, ; Peters, Bretscher, John, Scambelluri, & Pettke, ). Studies on the boninites of Isua greenstone belt (Polat et al, ) suggest that the Archean mafic and ultramafic rocks with LOI < 6% were subjected to variable alteration processes.…”

Section: Discussionmentioning

confidence: 99%

Neoarchean suprasubduction zone magmatism in the Sonakhan greenstone belt, Bastar Craton, India: Implications for subduction initiation and melt extraction

et al. 2018

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The Neoarchean Sonakhan greenstone belt (SGB) in the north‐eastern Bastar Craton is mainly composed of an association of pillowed and massive tholeiitic basalts emplaced within an intraoceanic environment. Two types of ultrabasic rocks were identified and are designated as TH‐1 and TH‐2 on the basis of geochemical parameters. Both sample suites exhibit depletion of HFSE with reference to LILE and LREE, LREE/HFSE ratios, and negative Nb–Ta–Ti anomalies in the primitive mantle‐normalized multi‐element diagrams. The geochemical characters of TH‐1 and TH‐2 are consistent with Island arc tholeiites (IAT) and boninite‐like rocks of both Archean and Phanerozoic terranes. Mineral chemistry of clinopyroxenes from both volcanic suites indicate an oceanic arc affinity. The chromite chemistry indicate its derivation from a boninite‐like magma in a suprasubduction zone (SSZ) environment. Trace element modelling depicts that source depletion with significant influence of fluids derived from the subducting oceanic slab collectively controlled the trace element inventory of the mantle wedge, which result to the higher abundance of LREE and LILE compared to HREE and HFSE. The occurrence of lower basalt sequence followed by IAT and boninite‐like rocks in the SGB define a magmatic evolution which is comparable to the Phanerozoic ophiolite suites that exhibit subduction initiation prior to forearc rifting and suprasubduction zone magmatism. The subduction initiation in the intraoceanic lithosphere and the initial decompression melting followed by the upwelling of the MORB‐related magmas were attributed to the formation of the lower pillow basalts. Dehydration of the subducting plate and the melt extraction processes in the hydrous lherzolite mantle wedge account for the formation of TH‐1. Subsequent depletion and significant modification of a more refractory harzburgite source by the slab‐derived fluids generated the TH‐2 rocks. The compositionally diverse magmatic imprints with IAT and boninite affinity in the SGB indicate the significance of episodic melt extraction processes, dehydration of the subducting plate, and hydrous fluxing in SSZ tectonic setting.

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Redox Variables and Mechanisms in Subduction Magmatism and Volcanism

Evans

Tomkins

2021

Magma Redox Geochemistry

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Fluid-mobile elements in serpentinites: Constraints on serpentinisation environments and element cycling in subduction zones

Cited by 91 publications

References 75 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

Neoarchean suprasubduction zone magmatism in the Sonakhan greenstone belt, Bastar Craton, India: Implications for subduction initiation and melt extraction

Redox Variables and Mechanisms in Subduction Magmatism and Volcanism

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