Thermal diffusivity of igneous rocks at elevated pressure and temperature

Durham, W. B.; Mirkovich, V. V.; Heard, H.C.

doi:10.1029/jb092ib11p11615

Cited by 73 publications

(31 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Open microfractures may hinder heat transfer (or seismic wave propagation) and thus explain such a difference between the modeled physical property and its measurement on a real rock. Closure of these air‐filled cracks is known to lead to a nonlinear increase of thermal diffusivity between 0 and 50–100 MPa [ Durham et al , 1987; Horai and Susaki , 1989; Seipold et al , 1998]. However, in the present high‐pressure data, this nonlinear increase is absent or very weak (Figure 5); the slightly nonlinear increase in thermal diffusivity between 0 and 25 MPa observed on some measurements is probably due to a bad contact between the thermocouple and the sample.…”

Section: Comparison Between Thermal Diffusivities Predicted By Petropcontrasting

confidence: 51%

Thermal diffusivity of upper mantle rocks: Influence of temperature, pressure, and the deformation fabric

et al. 2003

View full text Add to dashboard Cite

[1] Thermal diffusivity measurements of seven naturally deformed upper mantle rocks were made as a function of pressure (up to 1 GPa), temperature (up to 1250 K), and the deformation fabric of the samples. For each sample the strain-induced crystal preferred orientations of olivine and pyroxenes were measured, and petrophysical models, based on the thermal diffusivity tensors of the olivine and enstatite crystals, were used to evaluate the three-dimensional distribution of the thermal diffusivity. Both model predictions and measurements show that the anisotropy of thermal diffusivity remains large at the rock scale: 15-28%, depending on the strength of the olivine crystallographic fabric. The direction of maximum thermal diffusivity is parallel to the lineation (flow direction), and the minimum of thermal diffusivity is normal to the foliation plane (flow plane). This anisotropy is preserved at high temperature and pressure. However, measured thermal diffusivities are 20-30% lower than model predictions. This discrepancy between measurements and model predictions cannot be explained by the presence of cracks in the samples because the closure of these void spaces, evaluated through the high-pressure experiments, is found to have a negligible effect on measured thermal diffusivities. Thermal diffusivity for all samples displays a weak linear dependence on pressure of $10% GPa À1 . Thermal diffusivities observed in the high-temperature experiments (1000-1250 K) are compatible with a weak radiative contribution to the total heat diffusion.INDEX TERMS: 5112 Physical Properties of Rocks: Microstructure; 5134 Physical Properties of Rocks: Thermal properties; 8120 Tectonophysics: Dynamics of lithosphere and mantle-general; 8130 Tectonophysics: Heat generation and transport; KEYWORDS: mantle rocks, thermal diffusivity, lattice diffusivity, radiative heat transfer, anisotropy, petrophysical models.Citation: Gibert, B., U. Seipold, A. Tommasi, and D. Mainprice, Thermal diffusivity of upper mantle rocks: Influence of temperature, pressure, and the deformation fabric,

show abstract

Section: Comparison Between Thermal Diffusivities Predicted By Petropcontrasting

confidence: 51%

Thermal diffusivity of upper mantle rocks: Influence of temperature, pressure, and the deformation fabric

et al. 2003

View full text Add to dashboard Cite

show abstract

“…Thermal conductivity depends on composition: it increases with the quartz content (Clauser and Huenges, 1995, and references therein). Durham et al (1987) had measured the thermal conductivity variations for samples of different crustal rocks and proposed the following law for the thermal conductivity in the crust: l ¼ 2:26 À 618:241 T + l 0 255:576 T À 0:30247 The lattice conductivity decreases with temperature.…”

Section: Appendix C Climatic Effectsmentioning

confidence: 99%

Heat Flow and Thermal Structure of the Lithosphere

Jaupart

Mareschal²

2015

Treatise on Geophysics

View full text Add to dashboard Cite

“…This relationship is derived from measurements on samples from the Superior Province [Durham et al, 1987]. For temperatures higher than 700-800 K, radiative transport becomes important.…”

Section: Appendix C: Thermal Conductivitymentioning

confidence: 99%

Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data

Lévy

Jaupart

2011

J. Geophys. Res.

View full text Add to dashboard Cite

[1] We combine heat flux data and seismic velocity models for the North American lithosphere to derive constraints on thermal conditions and deformation mechanisms in the underlying convecting mantle. Local heat flux averages that are not affected by shallow crustal heat production contrasts allow calculation of reliable lithospheric geotherms and uncertainty ranges. For consistency with the seismic data, the mantle potential temperature beneath North America must lie within a 1290°C-1450°C range, close to that for the oceanic mantle sampled at mid-ocean ridges. The heat flux at the base of the lithosphere varies laterally from 11 ± 3 mW m −2 beneath the ∼250 km thick Archean core of the Superior province to 15 ± 3 mW m −2 beneath the thinner younger Appalachians province. It is shown that the most likely cause of such rates of heat supply into the North American continent is small-scale convection in an unstable boundary layer beneath the rigid mechanical lithosphere. This allows useful constraints on the mantle rheological properties. We show that the most likely deformation mechanism is dislocation creep in wet mantle rocks. Ranges for the mantle temperature, water content, and rheological parameters could be tightened very significantly once strong constraints are obtained on radiogenic heat production in the lithospheric mantle.Citation: Lévy, F., and C. Jaupart (2011), Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data,

show abstract

Thermal diffusivity of igneous rocks at elevated pressure and temperature

Cited by 73 publications

References 19 publications

Thermal diffusivity of upper mantle rocks: Influence of temperature, pressure, and the deformation fabric

Thermal diffusivity of upper mantle rocks: Influence of temperature, pressure, and the deformation fabric

Heat Flow and Thermal Structure of the Lithosphere

Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data

Contact Info

Product

Resources

About