Composition-based estimates of the thermal properties of New Zealand basement rocks: data used for calculations and figures

This archive contains four files with compositional data (mineralogical and geochemical) used to estimate thermal conductivity and heat production in New Zealand basement terranes (Kirkby et al., 2024).

HPR_source_data.csv - contains K, Th, and U concentrations and calculated heat production rates.

Longitude - longitude (New Zealand Geodetic Datum)
Latitude - latitude(New Zealand Geodetic Datum)
K_wtpct - K concentration in weight percent
Th_ppm - Th concentration in ppm
U_ppm - U concentration in ppm
Heat_production_uW/m3 - heat production calculated from K, Th and U concentrations, in microWatts per meter cubed
Terrane - name of basement terrane that sample has been assigned to
Source - source of data, either PetLAB (Strong et al. 2016), PMAP (Turnbull ref) or separate compilation for this study
Reference - Reference citation for data as listed in PetLAB/PMAP or added for this study

TC_from_majors_PMAP.csv - contains thermal conductivity estimated from major element geochemistry (Kirkby et al., 2024) using method of, Jennings et al. (2019).
Columns are as follows:

Collection - collection that sample is contained in within the PetLAB database (Strong et al., 2016)
Collection_Number - sample number within the collection above
Sample_ID - unique sample ID in PetLAB
Analysis_ID - unique analysis ID in PetLAB
Longitude - longitude (New Zealand Geodetic Datum)
Latitude - latitude(New Zealand Geodetic Datum)
**_wtpct - major oxide concentration in weight percent (normalised to non-volatile component)
Terrane - name of basement terrane that sample has been assigned to
Analysis_Method - analysis method for major oxide concentrations
Thermal_conductivity_pred - calculated estimate of thermal conductivity based on major oxide composition, W/mK
Bib_ref - analysis source reference, direct copy of Bib_ref field in PetLAB
Reference - analysis source reference, direct copy of Reference field in PetLAB

TC_from_modal_mineralogy.csv - contains thermal conductivity estimated from modal mineralogy (Kirkby et al., 2024).
Columns are as follows:

Longitude - longitude (New Zealand Geodetic Datum)
Latitude - latitude(New Zealand Geodetic Datum)
Analysis_ID - unique analysis ID in PetLAB
Collection - collection that sample is contained in within the PetLAB database (Strong et al., 2016)
Collection_ID - sample number within the collection above
Subsample - in the case of thermal conductivity, sometimes two samples were measured. This column distinguishes the two measurements
Mineralogy_method - method of determining mineralogy, either point count or QEMSCAN
Quartz - percentage of quartz in sample
Olivine - percentage of olivine in sample
Pyroxene - percentage of pyroxene in sample
Other - percentage of other minerals in sample
Thermal_conductivity_grain_pred - estimated thermal conductivity (W/mK) from mineralogy (Kirkby et al, 2024), W/mK
Thermal_conductivity_dry_measured - measured dry thermal conductivity (W/mK) for samples reported by Sanders et al (2024), W/mK
Porosity_measured_pct - measured porosity (percent) for samples reported by Sanders et al (2024)
Thermal_conductivity_grain_measured - grain thermal conductivity (W/mK) calculated from measured dry thermal conductivity and porosity
Terrane - name of basement terrane that sample has been assigned to
Bib_ref - analysis source reference, direct copy of Bib_ref field in PetLAB
Reference - analysis source reference, direct copy of Reference field in PetLAB

TC_from_normative_mineralogy.csv

Longitude - longitude (New Zealand Geodetic Datum)
Latitude - latitude(New Zealand Geodetic Datum)
Analysis_ID - unique analysis ID in PetLAB
Collection - collection that sample is contained in within the PetLAB database (Strong et al., 2016)
Collection_ID - sample number within the collection above
Mineralogy_method - method of determining mineralogy, either Mesonorm or CIPWnormhb (CIPW norm with hornblende)
Quartz - percentage of quartz in sample
Olivine - percentage of olivine in sample
Pyroxene - percentage of pyroxene in sample
Other - percentage of other minerals in sample
Thermal_conductivity_grain_pred - estimated thermal conductivity (W/mK) from mineralogy (Kirkby et al, 2024)
Thermal_conductivity_dry_measured - measured dry thermal conductivity (W/mK) for samples reported by Sagar et al (2022)
Porosity_measured_pct - measured porosity (percent) for samples reported by Sagar et al (2024)
Thermal_conductivity_grain_measured - grain thermal conductivity (W/mK) calculated from measured dry thermal conductivity and porosity
Terrane - name of basement terrane that sample has been assigned to
Bib_ref - analysis source reference, direct copy of Bib_ref field in PetLAB
Reference - analysis source reference, direct copy of Reference field in PetLAB

tc_by_terrane.csv

Contains thermal conductivity, standard deviation, and standard error of thermal conductivity estimates by terrane as shown in Figure 7 of Kirkby et al (2024)

hpr_by_terrane.csv

Contains thermal conductivity, standard deviation, and standard error of thermal conductivity estimates by terrane as shown in Figure 7 of Kirkby et al (2024).

References

Jennings, S., Hasterok, D., & Payne, J. (2019). A new compositionally based thermal conductivity model for plutonic rocks. Geophysical Journal International, 219(2), 1377-1394. https://doi.org/10.1093/gji/ggz376
Kirkby, A., N. Mortimer, R. Funnell, M. Sagar, A. Seward, K. Faure and F. Sanders (2024). Composition-based estimates of the thermal properties of New Zealand basement rocks, New Zealand Journal of Geology and Geophysics.
Sagar, M. W., Funnell, R., Randell, K., Faure, K., Seward, A., Sanders, F., & Stratford, W. R. (2022). Physical properties of Te Riu-a-Māui / Zealandia crustal rocks: Reconnaissance study and future research.  (GNS Science Internal Report 2022/05. 
Sanders, F., Seward, A., Sagar, M., & Faure, K. (2024). Thermal Properties of Zealandia Basement Rocks: results of Thermal Conductivity Scanner measurements 2023.  Lower Hutt. (GNS Science Report. 
Strong, D. T., Turnbull, R. E., Haubrock, S., & Mortimer, N. (2016). Petlab: New Zealand’s national rock catalogue and geoanalytical database. New Zealand Journal of Geology and Geophysics, 59(3), 475-481. https://doi.org/10.1080/00288306.2016.1157086