Water in the slab: A trilogy

Faccenda, Manuele

doi:10.1016/j.tecto.2013.12.020

Cited by 176 publications

(162 citation statements)

References 218 publications

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“…ref. 31), our data for the thermal conductivity of hydrous Fo90 with <200 wt ppm H 2 O (orange cross symbols in Fig. 1) already showed an about 25% lower value than the anhydrous Fo90 at about 14 GPa.…”

Section: Resultsmentioning

confidence: 60%

Hydration-reduced lattice thermal conductivity of olivine in Earth’s upper mantle

Chang

Hsieh

Tan

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Earth's water cycle enables the incorporation of water (hydration) in mantle minerals that can influence the physical properties of the mantle. Lattice thermal conductivity of mantle minerals is critical for controlling the temperature profile and dynamics of the mantle and subducting slabs. However, the effect of hydration on lattice thermal conductivity remains poorly understood and has often been assumed to be negligible. Here we have precisely measured the lattice thermal conductivity of hydrous San Carlos olivine (Mg 0.9 Fe 0.1 ) 2 SiO 4 (Fo90) up to 15 gigapascals using an ultrafast optical pump−probe technique. The thermal conductivity of hydrous Fo90 with ∼7,000 wt ppm water is significantly suppressed at pressures above ∼5 gigapascals, and is approximately 2 times smaller than the nominally anhydrous Fo90 at mantle transition zone pressures, demonstrating the critical influence of hydration on the lattice thermal conductivity of olivine in this region. Modeling the thermal structure of a subducting slab with our results shows that the hydration-reduced thermal conductivity in hydrated oceanic crust further decreases the temperature at the cold, dry center of the subducting slab. Therefore, the olivine−wadsleyite transformation rate in the slab with hydrated oceanic crust is much slower than that with dry oceanic crust after the slab sinks into the transition zone, extending the metastable olivine to a greater depth. The hydration-reduced thermal conductivity could enable hydrous minerals to survive in deeper mantle and enhance water transportation to the transition zone.hydration | thermal conductivity | geodynamics | metastable olivine | subducting slab H 2 O plays a critical role in driving and affecting many geophysical phenomena and dynamic processes in Earth's interior (1-3). It has been suggested that olivine, a primary mineral in the upper mantle, and its high-pressure polymorphs (wadsleyite and ringwoodite) could store a large amount of water (hydrogen ions) in their crystalline defects and act as a major water reservoir within Earth (2-4). Incorporation of water in these mantle minerals has been shown to influence their physical properties (5-12) and the dynamics of the mantle and subducting slabs (13). In particular, water enrichment could influence the minerals' thermal transport properties, which, in turn, alters the temperature gradient in the mantle and subducting slabs. At the center of subducting slabs, the cold temperature inhibits the olivine−wadsleyite/ringwoodite phase transformation (14). A thin wedge of olivine could therefore persist in a metastable state far below the 410-km depth. Previous experiments on transformation kinetics have shown that the presence of water inside the slabs greatly enhances the olivine−wadsleyite/ ringwoodite transformation rate under the same pressure and temperature conditions (15-18). However, the hydration effect on the lattice thermal conductivity of mantle minerals and its consequential influence on the temperature inside the slabs that also contro...

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Section: Resultsmentioning

confidence: 60%

Hydration-reduced lattice thermal conductivity of olivine in Earth’s upper mantle

Chang

Hsieh

Tan

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…1c and 2). The first few meters of rock above the serpentinites 159 exhibit intense Alpine metasomatism that has already been described in previous studies 160 (Martin et al, 2011;Vitale Brovarone et al, 2011b, 2014. These metasomatic rinds can be 161 followed for several kilometers along the top of the serpentinite body and are characterized by 162 lawsonite-rich assemblages, but diopside-rich rocks are also common.…”

Section: Structural Occurrence Of Metasomatic Marbles 155mentioning

confidence: 65%

Carbonation by fluid–rock interactions at high-pressure conditions: Implications for carbon cycling in subduction zones

Piccoli

Brovarone

Beyssac

et al. 2016

Earth and Planetary Science Letters

110

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“…Although Schmidt & Poli (1998) indicate that the slab is mostly dehydrated at a depth of 150-200 km, exhumation of subducted continental rocks with stishovite suggests that water can be transported up to depths of 250-300 km (Liu et al 2007). Furthermore, Faccenda et al (2009), Faccenda & Mancktelow (2010 and Faccenda (2014) have shown that tectonic stresses can influence the hydration pattern in the subducted slab, thereby allowing fluids to penetrate in the slab and favouring their transport to great depths up to the base of the upper mantle. The presence of hydrothermal circulation in the oceanic crust can affect the thermal state in the subducting slab, which generates higher hydrous phase stability at higher depths compared with those predicted by classical thermal models of the subduction zone (Perry et al 2016;Rosas et al 2016).…”

Section: A2 Hydration and Serpentinization Within The Wedge Areamentioning

confidence: 99%

“…Water trapped within the subducting oceanic plate is transported to large depths (e.g. Liu et al 2007;Faccenda 2014;Rosas et al 2016). The oceanic plate is then dehydrated because of the increased temperature and pressure (Schmidt & Poli 1998;Liu et al 2007;Faccenda et al 2009;Faccenda & Mancktelow 2010).…”

Section: Introductionmentioning

confidence: 99%

2-D numerical study of hydrated wedge dynamics from subduction to post-collisional phases

Regorda¹,

Roda²,

Marotta³

et al. 2017

Geophysical Journal International

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S U M M A R YWe developed a 2-D finite element model to investigate the effect of shear heating and mantle hydration on the dynamics of the mantle wedge area. The model considers an initial phase of active oceanic subduction, which is followed by a post-collisional phase characterized by pure gravitational evolution. To investigate the impact of the subduction velocity on the thermomechanics of the system, three models with different velocities prescribed during the initial subduction phase were implemented. Shear heating and mantle hydration were then systematically added into the models. We then analysed the evolution of the hydrated area during both the subduction and post-collisional phases, and examined the difference in P max -T (maximum pressure-temperature) and P-T max (pressure-maximum temperature) conditions for the models with mantle hydration. The dynamics that allow for the recycling and exhumation of subducted material in the wedge area are strictly correlated with the thermal state at the external boundaries of the mantle wedge, and the size of the hydrated area depends on the subduction velocity when mantle hydration and shear heating are considered simultaneously. During the post-collisional phase, the hydrated portion of the mantle wedge increases in models with high subduction velocities. The predicted P-T configuration indicates that contrasting P-T conditions, such as Barrovian-to Franciscan-type metamorphic gradients, can contemporaneously characterize different portions of the subduction system during both the active oceanic subduction and post-collisional phases and are not indicative of collisional or subduction phases.

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Water in the slab: A trilogy

Cited by 176 publications

References 218 publications

Hydration-reduced lattice thermal conductivity of olivine in Earth’s upper mantle

Hydration-reduced lattice thermal conductivity of olivine in Earth’s upper mantle

Carbonation by fluid–rock interactions at high-pressure conditions: Implications for carbon cycling in subduction zones

2-D numerical study of hydrated wedge dynamics from subduction to post-collisional phases

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