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Calculation of thermal conductivity of low-porous igneous rocks from modal mineralogy

Cite as:

Fuchs, Sven; Förster, Hans-Jürgen; Braune, Kathleen; Förster, Andrea (2018): Calculation of thermal conductivity of low-porous igneous rocks from modal mineralogy. GFZ Data Services. http://doi.org/10.5880/GFZ.6.2.2018.005

Status

I   N       R   E   V   I   E   W : Fuchs, Sven; Förster, Hans-Jürgen; Braune, Kathleen; Förster, Andrea (2018): Calculation of thermal conductivity of low-porous igneous rocks from modal mineralogy. GFZ Data Services. http://doi.org/10.5880/GFZ.6.2.2018.005

Abstract

This data set compiles the raw data that were used to calculate the bulk thermal conductivity (λb) of low-porosity igneous rocks from modal mineralogy, porosity, and nature of saturation fluid. It compliments a paper by Fuchs et al. (2018) to which it represents supplementary material. The paper reports the result of seeking out the mixing model(s) providing the best match between measured (λb.meas) and calculated bulk thermal conductivity (λb.calc) for low-porous igneous rocks. The study encompassed 45 samples representing various geological provinces in eight countries.

Our suite of samples covers the entire range from ultramafic (gabbro/diorite) to silicic rocks (granite), straddling the range 36–76 wt.% SiO2 (corresponding quartz range: 0–45 vol.%), and includes both such of alkaline, peralkaline, metaluminous, and peraluminous affinity. Assessment of the quality of fit involved all frequently applied mixing models that consider quantitative data on modal mineralogy.

Our evaluation clearly demonstrates that λb of low-porous igneous rocks, irrespective of being ultramafic or felsic, could be indirectly calculated from their mineral content with an acceptable error by employing the harmonic mean model. We show that the use of the harmonic-mean (HM) model for both rock matrix and porosity provided a good match between λb.meas and λb.calc of < 10% deviation (2σ), with relative and absolute errors amounting to 1.4 ± 9.7% and 4.4 ± 4.9% respectively. The results of our study constitute a big step forward to a robust conclusion on the overall applicability of the HM model for inferring λb of low-porous, mafic to silicic magmatic and metamorphic rocks with an acceptable magnitude of error.

The data included in this data publication are the tables and plots described in Fuchs et al. (2018). They are provided in Excel (.xlsx) and .csv Formats and are further described in the data description file. The diagrams are only included in the Excel version.

Dataset Contact

  • Fuchs, Sven (PostDoc) ; GFZ German Research Centre for Geosciences, Potsdam, Germany;

Keywords

Low-porous igneous rocks, Rock thermal conductivity, Modal Mineralogy, Mixing models, Harmonic mean, Statistical analysis

GCMD Science Keywords

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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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        • subject: Modal Mineralogy
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        • subject: Statistical analysis
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        • Dataset_Creator: Fuchs, Sven; Förster, Hans-Jürgen; Braune, Kathleen; Förster, Andrea
        • Dataset_Title: Calculation of thermal conductivity of low-porous igneous rocks from modal mineralogy
        • Dataset_Release_Date: 2018
        • Dataset_Release_Place: Potsdam, Germany
        • Dataset_Publisher: GFZ Data Services
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        • Topic: SOLID EARTH
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        • Topic: SOLID EARTH
        • Term: ROCKS/MINERALS/CRYSTALS
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        • Topic: SOLID EARTH
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      • Summary
        • Abstract: This data set compiles the raw data that were used to calculate the bulk thermal conductivity (λb) of low-porosity igneous rocks from modal mineralogy, porosity, and nature of saturation fluid. It compliments a paper by Fuchs et al. (2018) to which it represents supplementary material. The paper reports the result of seeking out the mixing model(s) providing the best match between measured (λb.meas) and calculated bulk thermal conductivity (λb.calc) for low-porous igneous rocks. The study encompassed 45 samples representing various geological provinces in eight countries. Our suite of samples covers the entire range from ultramafic (gabbro/diorite) to silicic rocks (granite), straddling the range 36–76 wt.% SiO2 (corresponding quartz range: 0–45 vol.%), and includes both such of alkaline, peralkaline, metaluminous, and peraluminous affinity. Assessment of the quality of fit involved all frequently applied mixing models that consider quantitative data on modal mineralogy. Our evaluation clearly demonstrates that λb of low-porous igneous rocks, irrespective of being ultramafic or felsic, could be indirectly calculated from their mineral content with an acceptable error by employing the harmonic mean model. We show that the use of the harmonic-mean (HM) model for both rock matrix and porosity provided a good match between λb.meas and λb.calc of < 10% deviation (2σ), with relative and absolute errors amounting to 1.4 ± 9.7% and 4.4 ± 4.9% respectively. The results of our study constitute a big step forward to a robust conclusion on the overall applicability of the HM model for inferring λb of low-porous, mafic to silicic magmatic and metamorphic rocks with an acceptable magnitude of error. The data included in this data publication are the tables and plots described in Fuchs et al. (2018). They are provided in Excel (.xlsx) and .csv Formats and are further described in the data description file. The diagrams are only included in the Excel version.
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        • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
      • creator
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