Thermal diffusivity of MORB-composition rocks to 15 GPa: implications for triggering of deep seismicity

Dobson, David P.; Hunt, Simon A.; McCormack, R.; Lord, O. T.; Weidner, Donald J.; Li, Li; Walker, Andrew

doi:10.1080/08957959.2010.516827

Cited by 14 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At high pressures and temperatures, various techniques have been applied in order to evaluate thermal conductivity and diffusivity of mantle minerals, e.g. the Ångström method in the multi-anvil apparatus [3,4], laser flash heating in the diamond anvil cell (DAC) [5], and a model-based approach utilizing IR reflectivity and thermoelastic data [6]. Theoretical calculations at high pressures are rare and mostly focused on simple single crystals, such as periclase, where the heat is conducted by lattice vibrations [7,8].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of hcp iron at high pressure and temperature

Konôpková

Lazor

Goncharov

et al. 2011

High Pressure Research

View full text Add to dashboard Cite

Results of steady-state heat transfer experiments on iron in laser-heated diamond anvil cell, combined with numerical simulation using finite-element method are reported. Thermal boundary conditions, dimensions of sample assemblage, heating-laser beam characteristics and relevant optical properties have been well defined in the course of experiments. The thermal conductivity of the polycrystalline hexagonal-iron foil has been determined up to pressure 70 GPa and temperature 2000 K. At these conditions, the conductivity value of 32 ± 7 W/m K was found. Sources of errors arising from uncertainties in input parameters and applied experimental procedures are discussed. Considering results of earlier preferred-orientation studies in diamond anvil cell, an averaging effect of polycrystalline texture on the intrinsic anisotropy is assumed. The obtained conductivity is interpreted as an effective value, falling in between the upper and lower bounds on the average conductivity of a random aggregate of uniaxial crystals.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of hcp iron at high pressure and temperature

Konôpková

Lazor

Goncharov

et al. 2011

High Pressure Research

View full text Add to dashboard Cite

show abstract

“…Synchrotron-based multi-anvil techniques have become routine for many studies, such as viscosity measurements of inviscid and stiff materials [1,2], phase relations [3], structure of melts [4], P-V-T equations of state [5][6][7] and thermal conductivity [8,9], where physical properties must be determined in situ. Diffraction-based studies gain optical access to the sample by passing X-rays through the gasket region between the tungsten carbide anvils which compress the sample; however, this limits the diffraction vector to a small proportion of the Debye ring and many imaging applications require larger X-ray windows than is available through the gasket region.…”

Section: Introductionmentioning

confidence: 99%

Slotted carbide anvils: improved X-ray access for synchrotron-based multi-anvil experiments

Dobson

Hunt

Müller

2012

High Pressure Research

Self Cite

View full text Add to dashboard Cite

We present a new technique to allow enhanced X-ray access to synchrotron-based multi-anvil experiments with tungsten carbide anvils. Slots of 2 mm width and 1 mm depth are cut into the four anvils which are in the beam path along their 110 diagonals and these slots are filled with baked pyrophyllite to produce a region in the anvils which is X-ray transparent. We have tested this arrangement using a standard 10/5 cell assembly and the X-ray window remains open, allowing imaging of a 2.5 by 2 mm section of the cell to at least 20 GPa. There is no evidence that the slots reduce the life of the anvils and the recovered slotted anvils have been used in subsequent experiments.

show abstract

“…[2010]; Haz: λ(T) data of harzburgite, which is calculated from that of olivine and enstatite; Ol: λ(T) data of Fo92 olivine, which is calculated from its thermal diffusivity from Pertermann and Hofmeister [2006]; En, λ(T) data enstertite, which is calculated from its thermal diffusivity data from previous literature [Schatz and Simmons, 1972;Petrunin and Popov, 1995;Chai et al, 1996]. Solid line: using eclogite (this study) for oceanic crust and harzburgite for lithospheric mantle; dashed line: using harzburgite for whole subducting slab; dash-dotted line: using eclogite [Dobson et al, 2010] for oceanic crust and harzburgite for lithospheric mantle. The thermal conductivity of the mantle wedge is assumed to be that of harzburgite.…”

Section: 1002/2014jb011208mentioning

confidence: 99%

“…Thus, the thermal properties of eclogite are important in the control of various tectonic processes. Dobson et al [2010] measured the thermal diffusivity of eclogite at 3.5 GPa as a function of temperature. Considering the stability field of eclogite (up to about 15 GPa), existing experimental data are insufficient to cover the entire subduction process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of thermal conductivity of omphacite, jadeite, and diopside up to 14 GPa and 1000 K: Implication for the role of eclogite in subduction slab

et al. 2014

View full text Add to dashboard Cite

Thermal conductivity and diffusivity for three pyroxenes, omphacite, jadeite, and diopside, were determined up to 14 GPa and 1000 K in the Kawai-type multianvil apparatus via the pulse heating method. Measurements for omphacite are characterized by much lower thermal conductivity and thermal diffusivity than those of its two end-members of jadeite and diopside, presumably because of the complex substitution of four cations (Na , and Mg +2 ) in omphacite. Therefore, simple arithmetic averaging is unsuitable for estimating thermal conductivity and diffusivity of the jadeite-diopside solid solution system. The thermal property of eclogite was estimated from those of garnet and omphacite. The thermal conductivity of eclogite is much smaller than that of harzburgite, which is assumed to compose of 80% olivine and 20% enstatite, implying that subducted oceanic crust impedes thermal conduction from the hotter wedge mantle to the subducting slab. Thermal structure simulation results show that temperature of the subduction zone is about 50°C decreased when the effect of oceanic crust is included.

show abstract

Thermal diffusivity of MORB-composition rocks to 15 GPa: implications for triggering of deep seismicity

Abstract: We have measured the thermal diffusivity of eclogite and majorite with a model MORB

Cited by 14 publications

References 22 publications

Thermal conductivity of hcp iron at high pressure and temperature

Thermal conductivity of hcp iron at high pressure and temperature

Slotted carbide anvils: improved X-ray access for synchrotron-based multi-anvil experiments

Measurement of thermal conductivity of omphacite, jadeite, and diopside up to 14 GPa and 1000 K: Implication for the role of eclogite in subduction slab

Contact Info

Product

Resources

About