Post-spinel transition in Mg2SiO4 determined by high P–T in situ X-ray diffractometry

Katsura, Tomoo; Yamada, Hitoshi; Shinmei, Toru; Kubo, Atsushi; Ono, Shigeaki; Kanzaki, Masami; Yoneda, Akira; Walter, Michael J.; Ito, Eiji; Urakawa, Satoru; Funakoshi, Kengo; Utsumi, Wataru

doi:10.1016/s0031-9201(03)00019-0

Cited by 214 publications

(171 citation statements)

References 20 publications

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“…Hirose (2002) demonstrated experimentally that this transition might occur at around 2070 K. This temperaturedependence to the phase transition leads to the possibility that upwellings and downwellings might be affected differently. We note that present-day estimates of mantle temperature at 660 km depth might be around 1880 K (Katsura et al, 2004); therefore, the negative Clapeyron slope could have played a dynamic role, at least for average and cold regions of the mantle, from early in Earth history.…”

Section: Introductionmentioning

confidence: 81%

“…This reaction is widely believed to correspond to the seismic discontinuity at 660 km depth, separating the upper and lower mantle (Bernal, 1936;Ringwood, 1969;Shim et al, 2001). Mineralogical work produces estimates of the Clapeyron slope between −0.5 MPa K −1 and −3.5 MPa K −1 , with recent values for a dry mantle heading towards the less negative value (Katsura et al, 2003;Fei et al, 2004;Litasov et al, 2005;Hirose, 2002;Ito and Takahashi, 1989;Irifune et al, 1998). illustrates a cold downwelling impinging on the phase change.…”

Section: Introductionmentioning

confidence: 94%

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Influence of the Ringwoodite-Perovskite transition on mantle convection in spherical geometry as a function of Clapeyron slope and Rayleigh number

Wolstencroft

Davies

2011

Solid Earth

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Abstract. We investigate the influence on mantle convection of the negative Clapeyron slope ringwoodite to perovskite and ferro-periclase mantle phase transition, which is correlated with the seismic discontinuity at 660 km depth. In particular, we focus on understanding the influence of the magnitude of the Clapeyron slope (as measured by the Phase Buoyancy parameter, P ) and the vigour of convection (as measured by the Rayleigh number, Ra) on mantle convection. We have undertaken 76 simulations of isoviscous mantle convection in spherical geometry, varying Ra and P . Three domains of behaviour were found: layered convection for high Ra and more negative P , whole mantle convection for low Ra and less negative P , and transitional behaviour in an intervening domain. The boundary between the layered and transitional domain was fit by a curve P = αRa β where α = −1.05, and β = −0.1, and the fit for the boundary between the transitional and whole mantle convection domain was α = −4.8, and β = −0.25. These two curves converge at Ra ≈2.5×10 4 (well below Earth mantle vigour) and P ≈ −0.38. Extrapolating to high Ra, which is likely earlier in Earth history, this work suggests a large transitional domain. It is therefore likely that convection in the Archean would have been influenced by this phase change, with Earth being at least in the transitional domain, if not the layered domain.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 94%

Influence of the Ringwoodite-Perovskite transition on mantle convection in spherical geometry as a function of Clapeyron slope and Rayleigh number

Wolstencroft

Davies

2011

Solid Earth

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“…[22] Recent in situ X-ray diffraction experiments have provided estimates of the Clapeyron slope for the olivineto-wadsleyite phase transition from +3.6 to +4.0 MPa/K [e.g., Morishima et al, 1994;Katsura et al, 2004] and the Clapeyron slope for the ringwoodite-to-perovskite phase transition from −1.3 to −0.4 MPa/K [e.g., Katsura et al, 2003;Fei et al, 2004]. Litasov et al [2005aLitasov et al [ , 2005b reported that the Clapeyron slope for the anhydrous ringwoodite-toperovskite transition is as small as −0.5 MPa/K, but that adding ∼2.0 wt% water can have the Clapeyron slope decrease to −2.0 MPa/K (Figure 12).…”

Section: Discussionmentioning

confidence: 99%

High‐resolution transition zone structures of the Gorda Slab beneath the western United States: Implication for deep water subduction

Cao

Levander

2010

J. Geophys. Res.

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[1] The current data set from USArray provides an unprecedented opportunity to investigate mantle transition zone structures beneath the western United States. We have made transition zone images with the Common Converted Point (CCP) stacking method. More than 9600 high quality receiver functions were stacked with reference to two different three-dimensional tomography models and a one-dimensional velocity model. Where the Gorda plate passes through the transition zone, the 410 discontinuity has been elevated ∼25 km and the 660 discontinuity has been depressed ∼35 km. We interpret the transition zone topography in terms of mineral physics results in several different ways, noting in particular that recent measurements on the Clapeyron slope for the ringwoodite-toperovskite phase transition under dry conditions give a phase boundary slope of ∼−1.3 to −0.4 MPa/K. The ∼35 km deflection of the 660 discontinuity observed in the receiver functions seems to be the evidence that the subducted slab can carry abundant water from the surface to the transition zone, and in the transition zone the water in the slab may be fully saturated (e.g. the water content is ∼2.0 wt%). Analyses of the velocity perturbations in the tomography models and the transition zone thickness indicate that the deep water is likely well confined within the subducted slab. We infer that the presence of water in the subducted Gorda slab might have contributed ∼15 km and the thermal anomaly in the slab might have contributed ∼20 km to the depression of the 660 discontinuity.Citation: Cao, A., and A. Levander (2010), High-resolution transition zone structures of the Gorda Slab beneath the western United States: Implication for deep water subduction,

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“…K for a sufficient duration (Ono et al 2001;Katsura et al 2003a). The purpose of 5 the present paper is to report the results of our studies of the zircon-reidite transition, which have been obtained by in situ X-ray observations using the multianvil and a synchrotron radiation source.…”

Section: Introductionmentioning

confidence: 99%

Phase transition of zircon at high P-T conditions

Ono

Funakoshi

Nakajima

et al. 2004

Contributions to Mineralogy and Petrology

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In situ observations of the zircon-reidite transition in ZrSiO 4 were carried out using a multianvil high-pressure apparatus and synchrotron radiation. The phase boundary between zircon and reidite was determined to be P (GPa) = 8.5 + 0.0017×(T-1200) (K) for temperatures between 1100-1900 K. When subducted slabs, including igneous rocks and sediments, descend into the upper mantle, zircon in the subducted slab transforms into reidite at pressures of about 9 GPa, corresponding to a depth of 270 km. Reidite found in an upper Eocene impact ejecta layer in marine sediments is thought to have been transformed from zircon by a shock event. The peak pressure generated by the shock event in this occurrence is estimated to be higher than 8 GPa.

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Post-spinel transition in Mg2SiO4 determined by high P–T in situ X-ray diffractometry

Cited by 214 publications

References 20 publications

Influence of the Ringwoodite-Perovskite transition on mantle convection in spherical geometry as a function of Clapeyron slope and Rayleigh number

Influence of the Ringwoodite-Perovskite transition on mantle convection in spherical geometry as a function of Clapeyron slope and Rayleigh number

High‐resolution transition zone structures of the Gorda Slab beneath the western United States: Implication for deep water subduction

Phase transition of zircon at high P-T conditions

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