Experimental constraints on the depth of olivine metastability in subducting lithosphere

Mosenfelder, J. L.; Marton, F. C.; Ross, Charles R.; Kerschhofer, Ljuba; Rubie, D. C.

doi:10.1016/s0031-9201(01)00226-6

Cited by 127 publications

(125 citation statements)

References 62 publications

Supporting

Mentioning

119

Contrasting

Order By: Relevance

“…NATURE COMMUNICATIONS | DOI: 10.1038/ncomms2414 ARTICLE seconds to minutes for chondrites from the size of high-P minerals and interface-controlled growth rate 31 . In contrast, however, shock experiments on porous MgO and fused quartz produced 1-3 mm wadsleyite in o1 ms (ref.…”

Section: Discussionmentioning

confidence: 99%

“…Thermodynamic data are available only for interface-controlled growth of ringwoodites 30,31 . Using the parameters in Mosenfelder et al, 31 the ringwoodite growth rate is B2 mm s À 1 .…”

Section: Discussionmentioning

confidence: 99%

“…Using the parameters in Mosenfelder et al, 31 the ringwoodite growth rate is B2 mm s À 1 . Given the observed range, an average size of ringwoodite of 2 mm corresponds to B1 s. The largest ringwoodite (Fig.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

The Tissint Martian meteorite as evidence for the largest impact excavation

et al. 2013

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

“…Thermodynamic data are available only for interface-controlled growth of ringwoodites 30,31 . Using the parameters in Mosenfelder et al, 31 the ringwoodite growth rate is B2 mm s À 1 .…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The Tissint Martian meteorite as evidence for the largest impact excavation

et al. 2013

View full text Add to dashboard Cite

“…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.…”

mentioning

confidence: 99%

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.

View full text Add to dashboard Cite

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...

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Experimental constraints on the depth of olivine metastability in subducting lithosphere

Cited by 127 publications

References 62 publications

The Tissint Martian meteorite as evidence for the largest impact excavation

The Tissint Martian meteorite as evidence for the largest impact excavation

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

Metastable transformations of eclogite to garnetite in subducting oceanic crust

Contact Info

Product

Resources

About