Full Record - Geochronological and geochemical data from the Read Group (Shackleton Range) and the Nimrod Complex, East Antarctica

Geochronological and geochemical data from the Read Group (Shackleton Range) and the Nimrod Complex, East Antarctica

GB/NERC/BAS/PDC/02268

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Summary

Abstract:
This dataset comprises whole-rock geochemistry, U-Pb zircon geochronology, Lu-Hf zircon isotope geochemistry, and K-feldspar Pb isotope geochemistry from a suite of samples from the Read Mountains and Du Toit Nunataks in the Shackleton Range (Read group), and the Miller and Geologists ranges in the central Transantarctic Mountains (Nimrod complex). A total of thirty-one samples were analysed, all metamorphic or igneous lithologies that were examined to understand their age, crustal origin and how they compare to potentially contiguous rocks in southeast Australia and southwest United States. The data were collected in the interval February 2024 to July 2026 across a number of laboratories: Stockholm Museum of Natural History (SIMS U-Pb geochronology), St Andrews Geochronology, StAGE (LA-ICPMS U-Pb geochronology, LA-MC-ICPMS Lu-Hf isotopic analysis, XRF whole-rock geochemistry), University College Dublin (K-feldspar Pb isotopic analysis) and the Ion Microprobe Facility hosted at the University of Edinburgh (SIMS U-Pb geochronology). The analyses were conducted by Joe Metcalfe (St Andrews, Stocklhom, Dublin), Teal Riley (Stockholm), Michael Flowerdew (Stockholm, Dublin) Sebastian Fischer (St Andrews), Joshua Garber (St Andrews), Heejin Jeon (Stockholm) and Cristina Talavera (Edinburgh).

This project was funded by IAPETUS2 Doctoral Training Partnership scheme through the Natural Environmental Research Council (grant NE/S007431/1)

Keywords:
East Antarctica, Hf isotopes, Nuna, Pb isotopes, Polar Rock Repository, geochronology, supercontinent

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Citation

Metcalfe, J., & Riley, T. (2026). Geochronological and geochemical data from the Read Group (Shackleton Range) and the Nimrod Complex, East Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/eacc2c09-e55c-4023-a3dc-e98215c525dd

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Access Data

Constraints

Access Constraints:	Under embargo until the publication of an associated paper.
Use Constraints:	This data is governed by the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy/) and supplied under Open Government Licence v.3 (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).

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Basic Information

Creation Date:	2026-09-02
Dataset Progress:	Complete
Dataset Language:	English
ISO Topic Categories:	Geoscientific Information
Parameters:	Solid Earth > Geochemistry
Personnel:
Name	UK Polar Data Centre
Role(s)	Metadata Author
Organisation	British Antarctic Survey

Name	Joseph Metcalfe
Role(s)	Investigator, Technical Contact
Organisation	British Antarctic Survey

Name	Teal R Riley
Role(s)	Investigator
Organisation	British Antarctic Survey

Parent Dataset:	N/A

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Additional Information

Reference:	Armistead, S. E., Eglington, B. M. & Pehrsson, S. J. (2024). PbIso: an R package and web app for calculating and plotting Pb isotope data. Canadian Journal of Earth Sciences, 61(1), 1-15. https://doi.org/10.1139/cjes-2023-0029 Blichert-Toft, J., 2008. The Hf isotopic composition of zircon reference material 91500. Chemical Geology, 253: 252-257. https://doi.org/10.1016/j.chemgeo.2008.05.014 Bouvier, A., Vervoort, J.D., Patchett, P.J., 2008. The Lu-Hf and Sm-Nd isotopic composition of CHUR: Constraints from unequilibrated chondrites and implications for the bulk composition of terrestrial planets. Earth and Planetary Science Letters, 273: 48-57. http://dx.doi.org/10.1016/j.epsl.2008.06.010 de Sampaio, P.A.B., Olierook, H.K.H., Fougerouse, D., McDonald, B.J., Jensen, N.K., Connelly, J.N., Rickard, W.D.A., Saxey, D.W., Evans, N.J., Bizzarro, M., Gardiner, N.J., Garber, J.M., Doucet, L.S., Li, Z.-X., 2025. Grey Hill Zircon - A Natural High 176Yb/177Hf Zircon Reference Material for LA-MC-ICP-MS Hf Isotope Measurement. Geostandards and Geoanalytical Research, 49: 799-819. https://doi.org/10.1111/ggr.70016 Granseth, A., Slagstad, T., Roberts, N.M.W., Hagen-Peter, G., Kirkland, C.L., Mokkelgjerd, S.H.H., Rohr, T.S., Coint, N., Sorensen, B.E., 2021. Multi-isotope tracing of the 1.3-0.9 Ga evolution of Fennoscandia; crustal growth during the Sveconorwegian orogeny. Gondwana Research, 91: 31-39. https://doi.org/10.1016/j.gr.2020.10.019 Janousek, V. (2024). HafAn: a R-language script aiding interpretation of the Hf isotopic data. Journal of Geosciences, 69(3), 151-160. https://doi.org/10.3190/jgeosci.391 Janousek, V., Bowes, D. R., Rogers, G., Farrow, C. M. & Jahn, B. (2006). Interpretation of whole-rock geochemical data in igneous geochemistry: introducing Geochemical Data Toolkit (GCDkit). Journal of Petrology, 47(6), 1255-1259. https://doi.org/10.1093/petrology/egl009 Jeon, H. & Whitehouse, M. J. (2015). A critical evaluation of U-Pb calibration schemes used in SIMS zircon geochronology. Geostandards and Geoanalytical Research, 39(4), 443-452. https://doi.org/10.1111/j.1751-908X.2014.00325.x Li, X., Tang, G., Gong, B., Yang, Y., Hou, K., Hu, Z., Li, Q., Liu, Y. & Li, W. (2013). Qinghu zircon: A working reference for microbeam analysis of U-Pb age and Hf and O isotopes. Chinese Science Bulletin, 58(36), 4647-4654. https://doi.org/10.1007/s11434-013-5932-x Liebmann, J., Ware, B., Hartnady, M. I., Kirkland, C. L., Timms, N. E. & Evans, N. J. (2023). Albany K-Feldspar: A New Pb Isotope Reference Material. Geostandards and Geoanalytical Research, 47(3), 637-655. https://doi.org/10.1111/ggr.12487 Ludwig, K. R. (2012). User's manual for Isoplot 3.75: A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication, 5, 75. Marsh, J., Jorgensen, T., Petrus, J., Hamilton, M. & Mole, D. (2019). U-Pb, trace element, and hafnium isotope composition of the Maniitsoq zircon: A potential new Archean zircon reference material. Twenty-ninth Annual Goldschmidt Conference, 2161. Nasdala, L., Hofmeister, W., Norberg, N., Martinson, J. M., Corfu, F., Dorr, W., Kamo, S. L., Kennedy, A. K., Kronz, A., Reiners, P. W., Frei, D., Kosler, J., Wan, Y., Gotze, J., Hager, T., Kroner, A. & Valley, J. W. (2008). Zircon M257-a homogeneous natural reference material for the ion microprobe U-Pb analysis of zircon. Geostandards and Geoanalytical Research, 32(3), 247-265. https://doi.org/10.1111/j.1751-908X.2008.00914.x Paton, C., Hellstrom, J., Paul, B., Woodhead, J., Hergt, J., 2011. Iolite: Freeware for the visualisation and processing of mass spectrometric data. Journal of Analytical Atomic Spectrometry, 26: 2508-2518. 10.1039/C1JA10172B Pearce, N. J., Perkins, W. T., Westgate, J. A., Gorton, M. P., Jackson, S. E., Neal, C. R., & Cheney, S. P. (1997). A compilation of new and published major and trace element data for NIST SRM 610 and SRM 612 glass reference materials. Geostandards Newsletter, 21(1), 115-144. https://doi.org/10.1111/j.1751-908X.1997.tb00538.x Segal, I., Halicz, L., Platzner, I.T., 2003. Accurate isotope ratio measurements of ytterbium by multiple collection inductively coupled plasma mass spectrometry applying erbium and hafnium in an improved double external normalization procedure. Journal of Analytical Atomic Spectrometry, 18: 1217-1223. 10.1039/b307016f Slama, J., Kosler, J., Condon, D.J., Crowley, J.L., Gerdes, A., Hanchar, J.M., Horstwood, M.S.A., Morris, G.A., Nasdala, L., Norberg, N., Schaltegger, U., Schoene, B., Tubrett, M.N., Whitehouse, M.J., 2008. Plesovice zircon - A new natural reference material for U-Pb and Hf isotopic microanalysis. Chemical Geology, 249: 1-35. https://doi.org/10.1016/j.chemgeo.2007.11.005 Soderlund, U., Patchett, P.J., Vervoort, J.D., Isachsen, C.E., 2004. The 176Lu decay constant determined by Lu-Hf and U-Pb isotope systematics of Precambrian mafic intrusions. Earth and Planetary Science Letters, 219: 311-324. https://doi.org/10.1016/S0012-821X(04)00012-3 Spencer, C.J., Kirkland, C.L., Roberts, N.M.W., Evans, N.J., Liebmann, J., 2020. Strategies towards robust interpretations of in situ zircon Lu-Hf isotope analyses. Geoscience Frontiers, 11: 843-853. https://doi.org/10.1016/j.gsf.2019.09.004 Stacey, J.S. & Kramers, J.D. 1975. Approximation of terrestrial lead isotope evolution by a two-stage model. Earth and Planetary Science Letters, 26 (2), 207-221. https://doi.org/10.1016/0012-821X(75)90088-6 Stern, R. A., Bodorkos, S., Kamo, S. L., Hickman, A. H. & Corfu, F. (2009). Measurement of SIMS instrumental mass fractionation of Pb isotopes during zircon dating. Geostandards and Geoanalytical Research, 33(2), 145-168. https://doi.org/10.1111/j.1751-908X.2009.00023.x Tyrrell, S., Haughton, P. D. W., Daly, J. S., Kokfelt, T. F. & Gagnevin, D. (2006). The use of the common Pb isotope composition of detrital K-feldspar grains as a provenance tool and its application to Upper Carboniferous paleodrainage, northern England. Journal of Sedimentary Research, 76(2), 324-345. https://doi.org/10.2110/jsr.2006.023 Tyrrell, S., Haughton, P. D., Daly, J. S. & Shannon, P. M. (2012). The Pb isotopic composition of detrital K-feldspar: A tool for constraining provenance, sedimentary processes and paleodrainage. https://doi.org/10.3749/9780921294825.ch11 Vermeesch, P. (2018). IsoplotR: A free and open toolbox for geochronology. Geoscience Frontiers, 9(5), 1479-1493.https://doi.org/10.1016/j.gsf.2018.04.001 Whitehouse, M. J. & Kamber, B. S. (2005). Assigning dates to thin gneissic veins in high-grade metamorphic terranes: a cautionary tale from Akilia, southwest Greenland. Journal of Petrology, 46(2), 291-318. https://doi.org/10.1093/petrology/egh075 Wiedenbeck, M. A. P. C., Alle, P., Corfu, F. Y., Griffin, W. L., Meier, M., Oberli, F. V., Von Quadt, A., Roddick, J. C. & Spiegel, W. (1995). Three natural zircon standards for U-Th-Pb, Lu-Hf, trace element and REE analyses. Geostandards Newsletter, 19(1), 1-23. https://doi.org/10.1111/j.1751-908X.1995.tb00147.x Woodhead, J., Hergt, J., Shelley, M., Eggins, S., Kemp, R., 2004. Zircon Hf-isotope analysis with an excimer laser, depth profiling, ablation of complex geometries, and concomitant age estimation. Chemical Geology, 209: 121-135. https://doi.org/10.1016/j.chemgeo.2004.04.026 Woodhead, J.D., Hergt, J.M., 2005. A Preliminary Appraisal of Seven Natural Zircon Reference Materials for In Situ Hf Isotope Determination. Geostandards and Geoanalytical Research, 29: 183-195. https://doi.org/10.1111/j.1751-908X.2005.tb00891.x
Quality:	All U-Pb (LA-ICP-MS) ages and Pb-Pb/Lu-Hf isotopic ratios are presented to 2sigma uncertainties, which are propagated for the external uncertainties of the secondary reference materials in Iolite 4 (Paton et al. 2011). For kernel density estimator plots of detrital zircons, U-Pb ages were calculated using the 207Pb/206Pb ratios. Discordance was determined using ((206Pb/238U age / 207Pb/206Pb age) * 100). EpsilonHf values were calculated using a 176Lu decay constant of 1.867 x 10^-11 y^-1 (Soderlund et al., 2004), the present-day chondritic 176Lu/177Hf value of 0.0336 and 176Hf/177Hf ratio of 0.282785 (Bouvier et al., 2008). Pb model source indices (mu, kappa) and model ages were calculated in PbIso using the second-stage Pb evolution model from Stacey & Kramers.
Lineage/Methodology:	Samples All 'Read Group' samples prefixed with station number 'Z.' are BAS samples collected during the 1994/95 EuroShack expedition or the 1968-1970 field seasons. All 'Nimrod Complex' samples prefixed with 'PRR' are samples loaned from the Polar Rock Repository at the Ohio State University in Columbus. Analytical methods Whole-rock geochemistry Samples were first crushed and then milled into a fine powder using an agate TEMA mill at the British Antarctic Survey in Cambridge. Whole rock compositions were then analysed using an energy-dispersive X-ray fluorescence (ED-XRF) spectrometer (SPECTROTM XEPOS HE) at the School of Earth & Environmental Sciences, University of St Andrews. The samples were analysed for major elements on glass beads, prepared by mixing 0.5 g of sample powder with 5 g of Li-borate flux (Li-metaborate and Li-tetraborate in an 80:20 mix), melting in a Pt-crucible in a muffle furnace at 1050 deg C, and casting and cooling in a Pt-mould. For trace element analysis, samples were prepared into pressed powder pellets by mixing 4 g of fine sample powder and 1 g of CEREOX binding wax and pressing in a stainless-steel die at 10 t pressure. The measured data were interpreted using the SPECTRO XLABPRO software, using a fundamental parameter-calibration made with >30 international certified reference materials (Certified Reference Materials (CRM); largely silicates) for major elements. The trace element calibration uses slightly fewer CRM, as values for measured elements are not available for all CRM. Loss-on-ignition (LOI) was determined by weighing ~1 g of sample powder before and after heating overnight at 1000 deg C. Zircon U-Pb geochronology Zircon U-Pb geochronology was conducted by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS, Ion Microprobe) across three separate laboratories: LA-ICP-MS LA-ICP-MS analyses were undertaken at the St Andrews Geochronology and Geochemistry facility (StAGE) at the University of St Andrews, UK using a New Wave UP213 aperture imaged 213 nm Nd:YAG solid-state laser coupled to an Agilent 8800 Triple Quadrupole ICP-MS operated in single-quad mode. The laser was operated at 45 % output and a frequency of 10 Hz, producing an estimated fluence of 2 to 2.5 J cm-2. Helium was used as carrier gas at a flow rate of 775 ml/min. 10 ml/min of N2 and 850 ml/min of Ar were subsequently mixed into the carrier gas, before flowing through a signal smoothing device ("squid") and then entering the plasma. Additional spot analyses for samples Z.681.2, Z.1440.3, Z.1444.2, and Z.1446.2 were undertaken using a RESOlution-SE 193 nm excimer laser ablation system with a Laurin Technic S155 Sample Cell connected to the same ICP-MS set up. The RESOlution laser was operated at 8 Hz frequency and a fluence of 5 J cm-2, with He and sample Ar flow rates of ~400 mL/min and ~1100 mL/min, respectively. An analytical spot size of 24 or 25 um was utilised across all analytical runs for standard and unknown analyses. 91500 zircon (1065.4 +/- 0.3 Ma; Wiedenbeck et al. 1995) was used as the primary reference material to correct for instrumental drift, mass bias, and laser-induced elemental fractionation. Plesovice (337.13 +/- 0.37 Ma; Slama et al. 2008), OGC (3465.4 +/- 0.6 Ma; Stern et al. 2009), and Maniitsoq (3008.70 +/- 0.72 Ma; Marsh et al. 2019) zircons were used as secondary reference materials, their respective ages were reproduced within error across all analytical runs. For trace elements, NIST SRM 612 (Pearce et al. 1997) was used as the primary reference material and 29 Si was used as an internal standard, assuming a stoichiometric Si content in zircon of 15 wt.%. Data reduction of the raw isotopic and elemental values was performed using Iolite 4 (Paton et al. 2011). All age and concordia calculations were done using IsoplotR (Ludwig 2012; Vermeesch 2018) and do not incorporate the long-term uncertainty (~2%) of the StAGE LA-ICP-MS setup. SIMS SIMS analyses were undertaken at both the NordSIMS facility within the Swedish Museum of Natural History in Stockholm and the Ion Microprobe Facility (IMF) housed at the University 349 of Edinburgh, performed by a CAMECA ims1280 and ims1270 ion microprobe, respectively. At the NordSIMS facility, a focused 16O2- primary beam was initiated by a Hyperion II radio-frequency plasma iron source and tuned to a current of 10 nA and a spot size of 15 um. The methodology otherwise mirrored that of Whitehouse & Kamber (2005), employing a single-ion counting electron multiplier (EM) to measure and amplify the positive secondary ions at a mass resolution (M/DeltaM) of c. 5000 and using the in-house developed software for data reduction. The analytical procedures at the IMF were similar to those described above with some minor differences. The 16O2- primary beam was operated at ~12 kV and a current of 4.9-4.7 nA, producing a spot size of 18 um. A higher mass resolution of c. 6000 was preferred to avoid Hf-based interferences. At both laboratories, 91500 zircon was used as the primary reference material and measured for its 206Pb/238U 16O and 238U 16O2 / 238U 16O compositions to calibrate U-Th-Pb determinations of unknowns (Jeon & Whitehouse 2015). M257 (561 +/- 0.3 361 Ma; Nasdala et al. 2008) or Qinghu (159.5 +/- 0.2 Ma; Li et al. 2013) zircons and OGC zircon were analysed as secondary reference materials at the NordSIMS and IMF facilities, respectively. For unknowns with 204Pb determination above limits of detection, common-Pb correction was applied to U-Pb isotopic ratios and ages, assuming the present-day terrestrial 207Pb/206Pb composition of 0.836 estimated by Stacey & Kramers (1975). K-feldspar Pb isotopic analysis Grain mounts of the light fraction retained following zircon separation were imaged by a Zeiss EVO MA 15 SEM housed at CASP and equipped with Oxford Instruments Ultim Max 100 EDS and Unity BSE/EDS detectors to determine major element composition and to locate fresh inclusion-free K-feldspar. In-situ Pb isotopic analyses of K-feldspar were carried out at the National Centre for Isotope Geochemistry, UCD School of Earth Sciences, University College Dublin. Analyses of samples Z.1437.3, Z.1439.2, Z.1444.1, and Z.1448.2 were carried out using a Thermo Fisher Scientific Neptune MC-ICP-MS, coupled with a Teledyne Cetac Analyte G2 193 nm excimer laser ablation system, and closely followed the procedure outlined by Tyrrell et al. (2012). 202Hg was monitored to correct for isobaric interference of 204Hg on 204Pb and 203Tl and 205Tl were measured and employed during standard-sample bracketing to correct for instrumental mass bias. Feldspars were ablated along a line at a speed of 2 um/s with ablation spot sizes of 88x88 um using a laser energy of 3.4 J/cm2 with 20 Hz frequency. NIST612 glass served as the primary reference material, whilst accuracy and precision of the analyses were monitored through repeat analyses of Shap K-feldspar (see supplementary information), which produced values within uncertainty of those reported by Liebmann et al. (2023) and Tyrrell et al. (2006). Data were reduced offline using in-house developed software. All remaining samples were analysed with the Teledyne Cetac Analyte G2 193 nm excimer laser attached to a Thermo Fisher Scientific Neoma MC-ICP-MS. The method was similar to that described above for the Neptune, but with 10 13Ohm amplifiers installed on the 202 and 204 masses to improve accuracy of the 202Hg correction and measurement of the 204Pb peak. Data were reduced offline using the 'Pb Isotopes DRS' data reduction scheme in Iolite 4 (Paton et al., 2011). Pb-Pb plots and calculation of model source indices (mu, omega, kappa) and model ages were completed using PbIso (Armistead et al. 2024). Zircon Lu-Hf isotopic analysis Lu-Hf isotopes in zircon were measured by LA-MC-ICPMS at the St Andrews Geochronology (StAGE) laboratory at the University of St Andrews (UK) using an Applied Spectra RESOlution-SE 193 nm excimer laser ablation system coupled to a Nu Plasma MC-ICP-MS. All spots were measured with a 50 um spot either overlapping or adjacent to previously analysed U-Pb isotopic spots, a fluence of 6.5 J/cm2, a repetition rate of 10-12 Hz, and an ablation period of 50 seconds, leading to pit depths on the order of 40-50 um. The laser was fired thrice at the same spot size before each shot to remove surface contamination; this material was allowed to wash out for 30 seconds prior to ablation, and each ablation was followed by a 40 second delay prior to the next cleaning shot. The ablated aerosol was transported to the ICPMS with a combination of Ar (nebulizer Ar gas flow ~0.95 L/min) and He (~300 mL/min). The following isotopes were measured on Faraday cups with a 0.2 second integration period: 171Yb, 173Yb, 174Yb, 175Lu (axial mass), 176Hf, 177Hf, 178Hf, 179Hf, and 180Hf. Total Hf ranged from ~2-6 V for all standards and unknowns. A suite of primary and secondary zircon standards were run every 9 unknowns. Data reduction followed the methods detailed in Granseth et al. (2021) as implemented in the "Hf Isotopes XBeta" data reduction scheme for Iolite 4 (Paton et al., 2011). The general outline of this method is as follows: i) baseline subtraction; ii) calculation of Hf mass bias using the measured 179Hf/177Hf compared to its canonical value (0.7325); iii) the use of a high Yb/Hf zircon standard (Grey Hill: de Sampaio et al., 2025) to calculate a scaling factor between betaYb and betaHf for low-Yb zircons; iv) subtracting 176Yb from 176(Hf+Lu+Yb) using the measured 173Yb, a known 176Yb/173Yb, and the betaYb calculated from betaHf using the scaling factor in the previous step; v) subtracting 176Lu from 176(Hf+Lu) using the measured 175Lu, canonical 176Lu/175Lu (0.02656), and the same betaYb; vi) calculating an interference and mass-bias-corrected 176Lu/177Hf using the measured 176Lu and 177Hf as well as averaging betaYb and betaHf; viI) normalizing final 176Lu/177Hf ratios using 91500 zircon as the primary standard (176Lu/177Hf = 0.000311+/-0.000136) (Blichert-Toft, 2008); viiI) calculating an interference and mass-bias corrected 176Hf/177Hf using the measured 176Hf, 177Hf, and betaHf; ix) normalizing final 176Hf/177Hf using Plesovice as the primary standard (176Hf/177Hf = 0.282482) (Slama et al., 2008); and x) propagating additional uncertainty into the 176Hf/177Hf ratios sufficient to make each secondary standard except Grey Hill (which exhibits excess scatter) a single population, yielding final uncertainties for most unknowns of 2-3 epsilonHf units. For steps ii, iii, and iv, we utilised the following empirically determined Yb isotope ratios on the StAGE system to subtract 176Yb and determine Yb mass bias factors: 176Yb/173Yb = 0.7977, 173Yb/171Yb = 1.132685. While these factors deviate from those on other systems (Segal et al., 2003), they are consistent and sufficient to correct zircons spanning a wide range of Yb/Hf values to their correct 176Hf/177Hf ratios. epsilonHf(t) values for all unknowns were calculated using the 176Lu decay constant of Soderlund et al. (2004) and CHUR parameters of Bouvier et al. (2008) and plotted using the HafAn plugin for GCDKit 6.3.0 (Janousek et al. 2006; Janousek 2024). Data were collected across three sessions within the same overall run. In the second session, the measured 178Hf/177Hf ratio for several of the standards was sometimes above the recommend range of acceptable values (1.46688-1.46746: Spencer et al., 2020), although only one unknown sample was affected. However, the analyses with elevated 178Hf/177Hf ratios have 176Hf/177Hf values within analytical uncertainty of the sample mean, and therefore they have not been excluded. Using these methods, we obtain the following values for the secondary standards, where each value is expressed as average 176Hf/177Hf +/- 2 SD 91500 = 0.282306+/-0.000058 [22] (known = 0.282308+/-0.000006: Blichert-Toft, 2008); Mud Tank = 0.282513+/-0.000078 [19] (known = 0.282507+/-0.000003: Woodhead and Hergt, 2005); Temora2 = 0.282674+/-0.000072 [16] (known = 0.282686+/-0.000010: Woodhead et al., 2004).

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Locality

Temporal Coverage:
Start Date	2024-02-01
End Date	2026-07-03

Spatial Coverage:
Latitude
Southernmost	-83.633
Northernmost	-80.676
Longitude
Westernmost	-28.024
Easternmost	157.9
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Location:
Location	Antarctica
Detailed Location	Nimrod Complex, East Antarctica
Location	Antarctica
Detailed Location	Shackleton Range, East Antarctica

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Instrumentation

Data Collection:	Data was processed using software by Janousek et al. (2006) Paton et al. (2011), Ludwig (2012), Vermeesch (2018), Armistead et al. (2024) and Janousek (2024).

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Storage

Data Storage:	.csv x6

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Discovery Metadata System