Implications of slab mineralogy for subduction dynamics

Bina, Craig R.; Stein, Seth; Marton, F. C.; Ark, Emily M. Van

doi:10.1016/s0031-9201(01)00221-7

Cited by 84 publications

(63 citation statements)

References 106 publications

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“…The downward deflection of the endothermic ringwoodite to bridgmanite + magnesiowüstite transition within the cold slabs leads to a local increase in buoyancy of the slabs, which hampers their further descent (e.g., Bina et al, 2001;Faccenda and Dal Zilio, 2017). In a pyrolitic composition, along a background (1300 °C potential) mantle temperature profile, the density jump at the ringwoodite to postspinel transition is 220 kg/m 3 (calculated with the database Goes et al | Subduction-transition zone review GEOSPHERE | Volume 13 | Number 3 from Stixrude and Lithgow-Bertelloni, 2011) (a 5.5% density increase relative to the density above the transition).…”

Section: Endothermic Phase Transitionmentioning

confidence: 99%

“…This would reduce the negative buoyancy of the oldest plates and aid their stagnation in the transition zone (Schmeling et al, 1999;Bina et al, 2001;Tetzlaff and Schmeling, 2009;Agrusta et al, 2014). The olivine component (in olivine, wadsleyite, or ringwoodite phase) makes up only ~60% of a peridotitic composition above 660 km.…”

Section: Endothermic Phase Transitionmentioning

confidence: 99%

“…The Clapeyron slope of the garnet transitions may also be low below ambient mantle temperatures. It is furthermore predicted to have a milder buoyancy effect than the transition of ringwoodite (Bina et al, 2001;Faccenda and Dal Zilio, 2017). It remains to be tested in regional subduction models with mobile trenches what the dynamic effect is of the interplay of these transitions.…”

Section: Endothermic Phase Transitionmentioning

confidence: 99%

“…It remains to be tested in regional subduction models with mobile trenches what the dynamic effect is of the interplay of these transitions. However, if the garnet transition spreads over a larger depth than the thickness of the slab, its effect would likely be significantly less than that of the olivine component transitions (Christensen and Yuen, 1985;Bina et al, 2001).…”

Section: Endothermic Phase Transitionmentioning

confidence: 99%

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Subduction-transition zone interaction: A review

et al. 2017

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTAs subducting plates reach the base of the upper mantle, some appear to flatten and stagnate, while others seemingly go through unimpeded. This variable resistance to slab sinking has been proposed to affect long-term thermal and chemical mantle circulation. A review of observational constraints and dynamic models highlights that neither the increase in viscosity between upper and lower mantle (likely by a factor 20-50) nor the coincident endothermic phase transition in the main mantle silicates (with a likely Clapeyron slope of -1 to -2 MPa/K) suffice to stagnate slabs. However, together the two provide enough resistance to temporarily stagnate subducting plates, if they subduct accompanied by significant trench retreat. Older, stronger plates are more capable of inducing trench retreat, explaining why backarc spreading and flat slabs tend to be associated with old-plate subduction. Slab viscosities that are ~2 orders of magnitude higher than background mantle (effective yield stresses of 100-300 MPa) lead to similar styles of deformation as those revealed by seismic tomography and slab earthquakes. None of the current transition-zone slabs seem to have stagnated there more than 60 m.y. Since modeled slab destabilization takes more than 100 m.y., lower-mantle entry is apparently usually triggered (e.g., by changes in plate buoyancy). Many of the complex morphologies of lower-mantle slabs can be the result of sinking and subsequent deformation of originally stagnated slabs, which can retain flat morphologies in the top of the lower mantle, fold as they sink deeper, and eventually form bulky shapes in the deep mantle.

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Section: Endothermic Phase Transitionmentioning

confidence: 99%

Section: Endothermic Phase Transitionmentioning

confidence: 99%

Section: Endothermic Phase Transitionmentioning

confidence: 99%

Section: Endothermic Phase Transitionmentioning

confidence: 99%

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Subduction-transition zone interaction: A review

et al. 2017

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“…Recent kinetic studies on the high -pressure transformation have suggested that olivine, enstatite, and garnet metastably survive without transforming to their high -pressure phases in the cold subducting plates (e.g., Hogrefe et al, 1994;Mosenfelder et al, 2001;Kubo et al, 2008). Their presences and non -equilibrium transformations under large overpressure conditions have significant implications for the dynamics of plate subduction by changing the density relation and mechanical properties (e.g., Rubie, 1984;Bina et al, 2001;Karato et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Metastable transformations of eclogite to garnetite in subducting oceanic crust

Nishi

Kubo

Kato

2009

Journal of Mineralogical and Petrological Sciences

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The eclogite -garnetite transformation experiments were conducted at 11 GPa and 1000 -1550 °C using synthesized polycrystalline eclogite with MORB composition as a starting material. We found that the eclogite -garnetite transformation proceeds by two stages, (1) precipitation of majoritic garnet from clinopyroxene and (2) formation of majoritic garnet from original pyropic garnet by absorption of clinopyroxene. The 1st stage in the transformation proceeds at 1000 °C for 180 minutes, however the 2nd stage was not observed even at the high temperature of 1550 °C on the same time scale. The differences in kinetics are due to contrasting diffusivities between clinopyroxene and garnet. The kinetic effect would modify the mineralogy and rock microstructures in MORB, which provides important implications for dynamics of subducting oceanic crust by changing the density and viscosity relation.

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Dynamic lithosphere within the Great Basin

Porter

Fouch

Schmerr

2014

Geochem. Geophys. Geosyst.

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To place new constraints on the short-term, broad-scale lithospheric evolution of plate interiors, we utilize broadband seismic data from the Great Basin region of the Western United States to produce high-resolution images of the crust and upper mantle. Our results suggest that parts of the Great Basin lithosphere has been removed, likely via inflow of hot asthenosphere as subduction of the Farallon spreading center occurred and the region extended. In our proposed model, fragments of thermal lithosphere removed by this process were gravitationally unstable and subsequently sank into the underlying mantle, leaving behind less dense, stronger, chemically depleted lithosphere. This destabilization process promotes volcanism, deformation, and the reworking of continental lithosphere inboard from plate margins. Our results provide evidence for a new mechanism of lithospheric evolution that is likely common and significant in postsubduction tectonic settings.

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Implications of slab mineralogy for subduction dynamics

Cited by 84 publications

References 106 publications

Subduction-transition zone interaction: A review

Subduction-transition zone interaction: A review

Metastable transformations of eclogite to garnetite in subducting oceanic crust

Dynamic lithosphere within the Great Basin

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