Table 7 (igneous - metamorphic rocks)

Čermák, Vladimír; Rybach, Ladislaus

doi:10.1007/10201894_64

Cited by 4 publications

(6 citation statements)

References 31 publications

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“…The rocks that are rich in feldspar show a decrease in ETC with T about 10 %, while for rocks that are poor in feldspar decrease more than 40 % . The ETC of some rocks with high feldspar content is relative independent of temperature or even increase with temperature . The pyroxene−granulite, which contains 34 % plagioclase, shows an increase of the ETC with T (see Figure c).…”

Section: Resultsmentioning

confidence: 95%

“…Eucken 125 found that thermal conductivity of crystalline materials decreases with temperature according to the eq 6. The values of λ 0 and A for some porous materials have been calculated. ,,, The present ETC results for sandstone, limestone, amphibolite, and granulite were fitted to eq 6, while for the pyroxene−granulite we used the linear relation The values of fitting parameters λ 0 and A are given in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Even within the same rock type, thermal conductivity can vary over a considerable range. For a large number of rocks, thermal conductivity data are available and classified by rock name and origin in several extensive compilations. − …”

Section: Introductionmentioning

confidence: 99%

“…High Temperature and High - Pressure Thermal Conductivity Measurements of Rocks: Literature Review. The thermal conductivity of various rock types and rocks forming minerals at high temperatures and high pressures have been reported by many authors. ,,,,− Basically the measurements of the ETC of rock materials reported in the literature were performed at high pressures but at low temperatures or at high temperatures and low pressures. The study of the combined effect of high temperature and high pressure on thermal conductivity of rocks is scarce.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pressure and Temperature on the Thermal Conductivity of Rocks

et al. 2005

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Effective thermal conductivity (ETC) of five dry rocks (sandstone, limestone, amphibolite, granulite, and pyroxenegranulite) have been measured over a temperature range from (273 to 423) K and at pressures up to 350 MPa with a steady-state parallel-plate apparatus. It is an absolute, steady-state measurement device with an operational temperature range of (273 to 1273) K and hydrostatic pressures up to 1500 MPa. The estimated uncertainty of the method is 2 %. The porosity of the samples (sandstone, limestone, amphibolite, granulite, and pyroxene-granulite) was 5 %, 5 %, 1.0 %, 1.0 %, and 1.2 %, respectively. A sharp increase of ETC was found for rocks at low pressures between (0.1 and 100) MPa along various isotherms between (273 and 423) K. At high pressures (P > 100 MPa), a weak linear dependence of the ETC with pressure was observed. The measured values of ETC of rocks were used to test and confirm of applicability of the various theoretical and semiempirical models. The effect of structure (size, shape, and distribution of the pores), porosity, and mineralogical composition on temperature and pressure dependences of the ETC of various rocks types is discussed.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Pressure and Temperature on the Thermal Conductivity of Rocks

et al. 2005

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“…Measurements were carried out at the Laboratoire ouvert de géothermie at the Institut national de la recherche scientifique (INRS) in Canada using an optical scanning instrument following the methodology of Popov et al [44]. For some formations there was no core available for measurement; the thermal conductivity value for these were taken from literature [8] and references therein , [45,46] and references therein, [47][48][49][50][51].…”

Section: South Slave Regionmentioning

confidence: 99%

Thermostratigraphic and Heat Flow Assessment of the South Slave Region in the Northwest Territories, Canada

Rajaobelison,

Thibault,

Comeau

et al. 2024

Preprint

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: Despite the elevated heat flow known in the Western part of the South Slave Region (Northwest Territories, Canada), a continuous and equilibrium geothermal gradient was never measured in boreholes below the communities where geothermal energy could be developed. This paper aims to predict the geothermal gradient and assess the Earth’s natural heat flow below the communities of Fort Providence, Kakisa, Hay River, and Enterprise. Temperatures from drill-stem test and bottom well logs were corrected for drilling disturbance and paleoclimates. Thermal conductivity and heat generation rate of the geological formations were determined from the literature and with new laboratory measurements. 1D models were developed to evaluate subsurface temperature through the sedimentary formations, based on a thermostratigraphic assessment. Results indicate a geothermal gradient varying from 44.1 ± 10.6 °C km-1 to 59.1 ± 14.9 °C km-1 and heat flow varying from 105.5 mW m-2 to 160.2 mW m-2 below the communities. These estimates are in agreement with the equilibrium geothermal gradients measured in the Cameron Hills, south of the four communities, and used to verify our predictions. Hay River appears to be the most promising community with the highest geothermal gradient estimated to be 59.1 ± 14.9 °C km-1.

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