612ab314-0398-42a2-8f33-65308a4157dc 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 2024-12-19 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 Falkland Islands, 2023-2024 2024-12-19 creation 2024-12-19 revision 2024-12-19 publication 2024-12-19 released 1.0 https://doi.org/10.5285/612ab314-0398-42a2-8f33-65308a4157dc doi GB/NERC/BAS/PDC/01971 https://data.bas.ac.uk/ Please cite this item as: Riley, T. (2024). Geochemical and geochronological data from the Falkland Islands, 2023-2024 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/612ab314-0398-42a2-8f33-65308a4157dc Geological fieldwork was carried out in the Falkland Islands in March 2022 to help understand the depositional history and provenance of Late Permian sedimentary rocks of East Falkland. To accurately determine their depositional age and precise provenance we conducted a detailed analysis of zircon geochronology and geochemistry. The files provided here include full analytical details and datasets from the laboratories used for the acquisition of U-Pb zircon geochronology and Lu-Hf isotope geochemistry. The data were collected in the interval November 2023 to July 2024 across a number of laboratories: University College London and Australian National University (U-Pb zircon geochronology); British Geological Survey (Lu-Hf isotopes). The analyses were conducted by Ian Millar (Canberra, British Geological Survey) and Andrew Carter (University College London). The analyses were conducted to examine the provenance and depositional history of the sedimentary successions of the Falkland Islands. Funding: This work was supported by NERC National Capability funding (Polar Expertise Supporting UK Research). 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 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 New Haven Falkland Islands Port Stephens Falkland Islands Ruggles Bay Falkland Islands Bodie Creek Falkland Islands Cape Pembroke Falkland Islands Bay of Harbours Falkland Islands Annie Brooks Bay Falkland Islands place Geology theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url crossReference textTable eng utf8 geoscientificInformation -60.83408 -59.37044 -52.13647 -51.68212 2023-11-01 2024-07-31 5.0 12.0 urn:ogc:def:crs:EPSG::5714 MSL height Not specific to any location or epoch. Hydrography. 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 115712 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=612ab314-0398-42a2-8f33-65308a4157dc 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 micrometers 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. Australia National University Detrital zircon ages were determined using a Sensitive High Resolution Ion Microprobe (SHRIMP) at the Australian National University. Zircons were mounted in epoxy resin, polished to expose the centers of the grains, and gold-coated. Internal zoning and grain characteristics were mapped by microphotography and cathodoluminescence imaging. Clean areas, free of cracks, inclusions and radiation damage were analyzed. Analysis was carried out with a primary O2- beam; secondary ion beam intensities were measured using an ion-counting detector. Calibration was carried out using zircon standards mounted together with the samples (mostly AS-3; Paces & Miller, 1993). Data were reduced for background, mass bias, calibration and common-Pb corrections using Isoplot (Ludwig, 2012). All errors on ages are at the 2sigma level. 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 Cetac Aridus II desolvating nebulizer. 0.01 l/min of nitrogen were introduced via the nebulizer in addition to Ar in order to minimize oxide formation. Lutetium (175Lu), Ytterbium (172Yb, 173Yb), and Hafnium (176Hf, 178Hf, 179Hf and 180Hf) isotopes were measured simultaneously during static 30 second ablation analyses. The spot size used was 25 µm; fluence = 8 J/cm2. Hf reference solution JMC475 was analyzed during the analytical session and sample 176Hf/177Hf ratios are reported relative to a value of 0.282160 for this standard. Correction for 176Yb on the 176Hf peak was made using reverse-mass-bias correction of the 176Yb/173Yb ratio empirically derived using Hf mass bias corrected Yb-doped JMC475 solutions (Nowell & Parrish, 2001). 176Lu interference on the 176Hf peak was corrected by using the measured 175Lu and assuming 176Lu/175Lu = 0.02653. Hf-isotope data was processed using the Iolite data reduction package (Paton et al., 2011). Three zircon reference materials (91500, Mud Tank, GJ1) were analyzed throughout the analytical session. The 91500 zircon reference material was used as the primary standard in Iolite, and was used to normalize the 176Lu/177Hf ratio assuming a value of 0.000311 (Woodhead & Hergt, 2005). 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. εHf 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