Title: Thermal conductivity of vesicular basalt from Hawaii
Abstract: Journal of Geophysical Research (1896-1977)Volume 79, Issue 32 p. 4875-4888 Thermal conductivity of vesicular basalt from Hawaii Eugene C. Robertson, Eugene C. RobertsonSearch for more papers by this authorDallas L. Peck, Dallas L. PeckSearch for more papers by this author Eugene C. Robertson, Eugene C. RobertsonSearch for more papers by this authorDallas L. Peck, Dallas L. PeckSearch for more papers by this author First published: 10 November 1974 https://doi.org/10.1029/JB079i032p04875Citations: 126AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Thermal conductivity measurements at 35°C under 30 bars uniaxial pressure were made on 61 samples of olivine-bearing basalt with solidity γ (1 − ф, where ф is porosity) ranging from 2 to 98%.Two series of tests were made, one with air and the other with water in the pores. Conductivity varies with γ, the abundance of olivine phenocrysts, and the nature of the pore fluid. From the lowest to the highest γ, the observed conductivities range from 0.2 to 4.3×10−3 cal/cm s °C for samples with air in the pores and from 2.0 to 5.8×10−3 cal/cm s °C for samples with water in the pores. Differences in vesicle size in samples of the same total porosity do not affect the thermal conductivity. The measured conductivities were compared with values calculated on the basis of 11 theoretical models and combinations using conductivities of air and water and a reasonably well determined conductivity of fully solid basalt. For air-saturated samples the values calculated by several models compare well with observed values for samples with solidity of <0.9. Samples with high solidity have measured conductivities appreciably less than the conductivity determined for fully solid rock; in olivine-poor samples the difference is 40%. For water-saturated samples the measured values also are less than the value for solid rock, 15% less for olivine-poor samples. We postulate that the difference between observed and calculated conductivities for both air- and water-saturated samples is due to the insulating effect of micropores and thin microfractures that were formed during initial cooling of the volcanic samples; these micropores and microfractures were not completely filled with water during our measurements of water-saturated samples. In still-cooling newly formed lava the microfractures will not yet have opened, and the conductivity of the lava may be higher than what would be predicted from our measurements. When empirical correction factors are used to account for the insulating effect of the microfractures and micropores, the conductivity of basalt can be predicted by two models. When the mean of the parallel and series models is used, the conductivity of both air- and water-saturated samples can be predicted within 0.3×10−3 cal/cm s °C from the mineral and pore fluid compositions, conductivities, and proportions. With a quadratic model the values for the square root of conductivity form linear plots against solidity, requiring only the porosity and abundance of olivine phenocrysts of Hawaiian basalts to estimate conductivity within 0.2×10−3 cal/cm s °C. Citing Literature Volume79, Issue32Solid Earth and Planets10 November 1974Pages 4875-4888 RelatedInformation
Publication Year: 1974
Publication Date: 1974-11-10
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 167
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