Jolts in the Jade factory: A route for subduction fluids and their implications for mantle wedge seismicity

Muñoz-Montecinos, Jesús; Cambeses, Aitor; Raimondo, Tom; Deldicque, Damien; Garcia‐Casco, Antonio

doi:10.1016/j.earscirev.2021.103720

Cited by 12 publications

(8 citation statements)

References 122 publications

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“…Similar lateral changes in deformation style and composition of mélange blocks and its fabrics have also been observed in Arosa by Bachmann, Oncken, et al. (2009 and Bachmann, Glodny, et al., 2009) and are supported by numerical modeling, showing transient changes between underplating and erosion (Angiboust et al., 2021).…”

Section: Discussionsupporting

confidence: 74%

“…The scale of the transition between the situations of Norsi and Cavo, although possibly diachronous and documenting different stages of the history of the Ligurian subduction, is on the order of tens of kilometers, consistent with the transitions between accretionary and erosional margins observed in modern subduction zones when trenches experience subduction of topographic highs or incipient collision (e.g., New Britain Trench; Galewsky & Silver, 1997;Honza et al, 1989;Riker-Coleman et al, 2006). Similar lateral changes in deformation style and composition of mélange blocks and its fabrics have also been observed in Arosa by and are supported by numerical modeling, showing transient changes between underplating and erosion (Angiboust et al, 2021).…”

Section: Cavo and Norsi: Two End-members Of Subduction Channel Proces...supporting

confidence: 80%

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Deformation and Material Transfer in a Fossil Subduction Channel: Evidence From the Island of Elba (Italy)

et al. 2022

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We document an exhumed plate boundary shear zone—a subduction channel—developed at the contact between a fossil Cretaceous‐Eocene accretionary prism (Ligurian Units) and the underlying continent‐derived nappes of the Northern Apennines. The subduction channel, referred to as the Norsi‐Cavo Complex (NCC), is continuously exposed for ∼10 km along strike on the island of Elba. The NCC consists of oceanic sediments and serpentinites, coupled at the base of the prism. In its northernmost exposures the NCC crops out as a serpentinite mélange with blocks of sedimentary rocks. There, evidence of pervasive fluid‐rock interaction is present. We interpret this mélange as the result of material transfer from the upper plate to the subduction channel through tectonic erosion at the base of the prism. The southern part of the NCC preserves a series of tectonic slices of shales and limestones (Palombini shales) coupled with ultramafic rocks through serpentinite shear zones containing lenses of massive serpentinites, mafic rocks, and sediments. Since sedimentary slices preserve the same structures of the overlying Ligurian Units, produced by accretionary prism deformation, we interpret this complex as the result of material transfer from the prism to the subduction channel and its subsequent underplating at the base of the prism. Based on our interpretation, the NCC fossil subduction channel formed during E‐verging deformation over the W‐directed subduction of the Ligurian Ocean during the early development stages of the Apennines. This deformation terminated when the continental margin entered the subduction.

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Section: Discussionsupporting

confidence: 74%

Section: Cavo and Norsi: Two End-members Of Subduction Channel Proces...supporting

confidence: 80%

Deformation and Material Transfer in a Fossil Subduction Channel: Evidence From the Island of Elba (Italy)

et al. 2022

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“…However, only hot fluids deliver Al in appreciable quantity to the slab surface, that is, at different depths depending on slabs thermal structure. This not only supports a metasomatic origin for jadeites (Angiboust, Muñoz-Montecinos, et al, 2021;Harlow & Sorensen, 2005), but it suggests that the alumina content (e.g., their aluminum saturation index) of subduction zone fluids may be used as chemo/geothermometer. The experimental evidence for the high incompatibility of K in high-P/T metasediments (Schmidt, 2015;Schmidt et al, 2004) suggests that the mobility of this element may be elevated at depth.…”

Section: Metasomatic Redistribution Of Elements and Arc Magma Signaturesmentioning

confidence: 64%

The Subducting Slab as a Chromatographic Column: Regimes of Sub‐Solidus Mass Transport as a Function of Lithospheric Hydration State, With Special Reference to the Fate of Carbonate

Zhong

Gálvez

2022

JGR Solid Earth

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“…4,6,7,9), as observed in jadeitites by Harlow et al 45 , and suggests precipitation from multiple fluid pulses (e.g. 46 ) or from an evolving fluid not in equilibrium with the surrounding rock.…”

Section: Microstructural and Microchemical Constraints Of Dilational ...mentioning

confidence: 75%

“…The brecciation of hard rock types at subduction zone HP conditions has been in some cases associated with deep seismic ruptures and transiently high pore pressure (e.g. 46,[57][58][59] ). Additionally, Similar breccias to the ones described in this study are also found at shallower (crustal) depths in carbonate rocks and were related to seismic failure 18,60 .…”

Section: Discussionmentioning

confidence: 99%

Methane-hydrogen-rich fluid migration triggers seismic failure in subduction at forearc depths

Brovarone

Menegon

Siron

et al. 2023

Preprint

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Metamorphic fluids and deformation zones are fundamental carriers of carbon from the deep Earth to shallower reservoirs. It is well established that water weakens rocks and contributes to trigger seismicity. Conversely, the potential effects of carbon-rich aqueous fluids on deep-seated rocks remain little studied. Some of these fluids may be reduced and transport energy sources such as natural H2 and CH4. Mechanisms and pathways capable to transport these deep energy sources towards shallower reservoirs, where they may be used by microbial life in the subsurface biosphere, remain unidentified. Here we present direct geological evidence of seismic failure of mechanically strong rock types due to the accumulation of CH4-H2-rich fluids at deep forearc depths, which ultimately reached supralithostatic pore fluid pressure. These fluids originated from adjacent reduction of carbonates by H2-rich fluids during serpentinization at eclogite-to-blueschist-facies conditions. Thermodynamic modelling predicts that the production and accumulation of carbon-rich fluids can produce overpressure much more easily than C-poor aqueous fluids, and that CH4-H2-rich fluids are more favourable to produce overpressure than CO2-rich ones. This study provides tangible evidence for the migration of deep Earth energy sources along tectonic discontinuities and suggests causal relationships with brittle failure of hard rock types that may trigger seismicity at forearc depths.

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Jolts in the Jade factory: A route for subduction fluids and their implications for mantle wedge seismicity

Cited by 12 publications

References 122 publications

Deformation and Material Transfer in a Fossil Subduction Channel: Evidence From the Island of Elba (Italy)

Deformation and Material Transfer in a Fossil Subduction Channel: Evidence From the Island of Elba (Italy)

The Subducting Slab as a Chromatographic Column: Regimes of Sub‐Solidus Mass Transport as a Function of Lithospheric Hydration State, With Special Reference to the Fate of Carbonate

Methane-hydrogen-rich fluid migration triggers seismic failure in subduction at forearc depths

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