270714e6-f141-4c01-8a13-2bdfaca80ced eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2025-09-30 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Geochemical and geochronological data from the Drygalski Fjord region of South Georgia 2025-09-30 creation 2025-09-30 revision 2025-09-30 publication 2025-09-30 released 1.0 https://doi.org/10.5285/270714e6-f141-4c01-8a13-2bdfaca80ced doi GB/NERC/BAS/PDC/02087 https://data.bas.ac.uk/ Please cite this item as: Riley, T. (2025). Geochemical and geochronological data from the Drygalski Fjord region of South Georgia (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/270714e6-f141-4c01-8a13-2bdfaca80ced This dataset comprises U-Pb zircon geochronology and Lu-Hf isotope geochemistry on a suite of rock samples from the Drygalski Fjord region of south eastern South Georgia. Six samples were analysed: all sandstone lithologies that were examined to understand their geological provenance and how they compare to similar units from southern South America. The data were collected in the interval November 2023 to March 2024 across a number of laboratories: Stockholm Museum of Natural History and University College London (U-Pb zircon geochronology); British Geological Survey (Lu-Hf isotopes). The analyses were conducted by Ian Millar (British Geological Survey) Teal Riley (Stockholm) and Andrew Carter (University College London). The analyses were conducted to examine the provenance and depositional history of the sedimentary successions of South Georgia. This project was funded by NERC National Capability funding to the British Antarctic Survey's Paleo Environments, Ice Sheets and Climate Change team. No credit. completed Riley, Teal British Antarctic Survey Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Solid Earth > Geochemistry > Isotopes theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Geochemistry Geochronology Provenance Zircon theme Drygalski Fjord South Georgia Island Cooper Island South Georgia Island Salomon Glacier South Georgia Island place Geology theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions public access limited according to Article 13(1)(e) of the INSPIRE Directive license Open Government Licence v3.0 otherRestrictions This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions and supplied under Open Government Licence v.3 (). Riley, T. (2025). Geochemical and geochronological data from the Drygalski Fjord region of South Georgia (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/270714e6-f141-4c01-8a13-2bdfaca80ced otherRestrictions Data is under embargo until the publication of an associated manuscript url url crossReference textTable eng utf8 geoscientificInformation -35.77369 -35.77369 -54.80569 -54.80569 2023-11-01 2024-03-31 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/csv bytes 180224 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=270714e6-f141-4c01-8a13-2bdfaca80ced WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Analytical methods Zircon U-Pb geochronology was conducted at five separate laboratories. University College London Zircon U-Pb geochronology used laser ablation inductively coupled mass spectrometry (LA-ICP-MS) facilities (Agilent 7700 coupled to a New Wave Research 193 nm excimer laser) at the London Geochronology Centre based in University College London. Heavy minerals were separated from bulk sediment samples using standard density liquid and magnetic separation procedures. Zircon-enriched extracts were mounted in hard epoxy resin on glass slides and polished for analysis. Typical laser spot sizes of 25 mircometers were used with a 7-10 Hz repetition rate and a fluence of 2.5 J/cm2. Background measurement before ablation lasted 15 seconds and laser ablation dwell time was 25 seconds.The external zircon standard was Plesovice,which has a TIMS reference age 337.13 +/- 0.37 Ma (Slama et al., 2008). Standard errors on isotope ratios and ages include the standard deviation of 206Pb/238U ages of the Plesovice standard zircon. Time-resolved signals that record isotopic ratios with depth in each crystal were processed using GLITTER 4.5, data reduction software, developed by the ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC) at Macquarie University and CSIRO Exploration and Mining. Processing enabled filtering to remove spurious signals owing to overgrowth boundaries, weathering, inclusions, or fractures. NordSIMS analytical facility (Stockholm) Zircons were separated and concentrated from rock samples at the British Antarctic Survey, Cambridge. From the zircon concentrate, hand-picked grains were mounted in epoxy resin along with the Geostandards zircon 91500 (207Pb/206Pb age of 1065.4 +/- 0.3 Ma), which has reported U and Pb concentrations of 80 ppm and 15 ppm respectively (Wiedenbeck et al., 1995). The mount was polished to expose the centres of the grains and imaged by SEM using a cathodoluminescence (CL) detector in order to reveal their internal structure and guide analysis location. U-Pb ion-microprobe zircon geochronology was carried out using a CAMECA 1280 ion microprobe at the NordSIMS facility housed at the Swedish Museum of Natural History in Stockholm. The analytical method closely followed Whitehouse and Kamber (2005) but differs insomuch that the oxygen ion primary beam was generated using a high-brightness, radiofrequency (RF) plasma ion source (Oregon Physics, Hyperion II, rather than a duoplasmatron) and a focused beam instead of illuminated aperture. The 10 nA O2- beam was rastered over 5x5 micrometers to homogenize beam density, the final analytical spot size being ca. 15 micrometers in diameter. Sputtered secondary ions introduced into the mass spectrometer were analyzed using a single ion counting electron multiplier over 10 cycles of data. Data were reduced using in-house developed software. The power law relationship between 206Pb/238U16O and 238U16O2/238U16O measured from the 91500 standard was used to calibrate U/Pb ratios following the recommendations of Jeon and Whitehouse (2015). Common-Pb corrections were applied to analyses where statistically significant 204Pb was detected, using the present-day terrestrial common Pb estimate of Stacey & Kramers (1975). Terra-Wasserburg U-Pb concordia diagrams were drawn using Isoplot v. 4.15 (Ludwig, 2012). 207Pb corrected ages were calculated assuming non-radiogenic Pb was from surface contamination and had an isotopic composition of modern-day average terrestrial common Pb (207Pb/206Pb = 0.836; Stacey & Kramers 1975). Lu-Hf isotope analysis Isotope analyses were carried out at NIGL using a Thermo Scientific Neptune Plus MC-ICP-MS coupled to a New Wave Research UP193UC Excimer laser ablation system. Helium was used as the carrier gas through the ablation cell with Ar make-up gas being connected via a T-piece and sourced from a Cet...(17) Data quality: U-Pb ages were calculated using the 206Pb/238U ratios for samples dated as <1.1 Ga, and the 207Pb/206Pb ratios was used for older grains. Discordance was determined using (207Pb/235U - 206Pb/238U) / 206Pb/238U) and similar for 207Pb/206Pb ages. Lu_Hf analytical uncertainties for unknowns were propagated by quadratic addition to include the standard error of the mean of the analysis and the reproducibility of the 91500 reference material. epsilonHf values were calculated using a 176Lu decay constant of 1.867 x 10-11y-1 (Söderlund et al., 2004), the present-day chondritic 176Lu/177Hf value of 0.0336 and 176Hf/177Hf ratio of 0.282785 (Bouvier et al., 2008). asNeeded completed