49a1ec0e-ae5f-4df5-a59b-fa6dff614678 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 2020-07-14 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 Fossil diatom and geochemistry data from a 700-year core from La Grange Cop, subantarctic Marion Island 2020-07-14 creation 2020-07-14 revision 2020-07-14 publication 2020-07-14 released 1.0 https://doi.org/10.5285/49a1ec0e-ae5f-4df5-a59b-fa6dff614678 doi GB/NERC/BAS/PDC/01363 https://data.bas.ac.uk/ NE/K004514/1 award Please cite this item as: Perren, B., Hodgson, D., Roberts, S., Sime, L., Van Nieuwenhuyze, W., Verleyen, E., & Vyverman, W. (2020). Fossil diatom and geochemistry data from a 700-year core from La Grange Cop, subantarctic Marion Island. (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/49a1ec0e-ae5f-4df5-a59b-fa6dff614678 This dataset contains geochemistry measurements and fossil diatom counts made on a sediment core from La Grange Cop lake, Marion Island (46deg94S, 37deg60E, 60 m above sea level). The dataset consists of diatom relative frequencies, diatom principal components analysis (PCA), and diatom-inferred conductivity, ITRAX scanning XRF elemental percentages and XRF PCA, C%, N%, and delta13C measurements, and magnetic susceptibility measurements. Ages of the sediment samples were assigned based on an age depth model derived from 210Pb, 137Cs, and 14C measurements and span the last c. 700 years. This project was funded by UK Natural Environment Research Council Grant NE/K004514/1 to Dominic A Hodgson and a Research Foundation-Flanders travel bursary to Elie Verleyen. No credit. completed Perren, Bianca British Antarctic Survey Researcher author Hodgson, Dominic British Antarctic Survey Researcher author Roberts, Stephen British Antarctic Survey Researcher author Sime, Louise British Antarctic Survey Researcher author Van Nieuwenhuyze, Wim Ghent University Researcher author Verleyen, Elie Ghent University Researcher author Vyverman, Wim Ghent University 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 > Biosphere > Microbiota Taxonomy > Diatoms 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 Diatoms ITRAX Marion Island geochemistry magnetic susceptibility paleolimnology subantarctic islands theme Marion Island Southern Africa place Habitats and biotopes 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 Please cite this dataset as follows: Perren, B., Hodgson, D., Roberts, S., Sime, L., Van Nieuwenhuyze, W., Verleyen, E., & Vyverman, W. (2020). Fossil diatom and geochemistry data from a 700-year core from La Grange Cop, subantarctic Marion Island. (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/49A1EC0E-AE5F-4DF5-A59B-FA6DFF614678 url url crossReference doi doi crossReference textTable eng utf8 biota environment geoscientificInformation 37.58 37.58 -46.93 -46.93 2013-04-01 2013-04-30 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/plain bytes 184320 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=49a1ec0e-ae5f-4df5-a59b-fa6dff614678 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Cores were extracted from the deepest part (~4m depth) of La Grange Cop, on Marion Island (46deg56'S, 37deg35'E) using a Livingston piston core in 2013. The uppermost sediments were retrieved using a UWITEC corer, which was extruded and subsampled at 0.5 cm intervals in the field. Age determinations were made using 14C, 210Pb and 137Cs radiometric methods on bulk organic sediments. Age-depth models were generated using the software package BACON in R (Blaauw and Christen, 2011). Diatoms were isolated from the sediments using standard oxidative techniques (Renberg, 1990) and mounted on plain glass coverslips using NAPHRAX mounting medium. Taxonomic assignments were made using reference literature primarily with Van de Vijver et al. (2002) and using reference photographs to ensure consistency with the diatom-conductivity model and amongst subantarctic island analysts. At least 400 valves were identified from each slide on an Olympus BX60 microscope at 1000x magnification and phase contrast under oil immersion. PCA was performed on centered relative percentage diatom data (>1% in any one sample) from the lake using the software package C2 (Juggins, 2016). Changes in bulk sediment geochemistry was undertaken on flat half-core wet sediment surfaces using an ITRAX core scanner at Aberystwyth University fitted with a Molybdenum (Mo) X-ray tube. X-radiography settings were 50 kV, 50mA, 200ms; micro-XRF; Mo settings: 30 kV, 50 mA, count time 10 seconds, 200 micro-m or 2 mm interval with 50- or 5-point moving average for 1 cm subsample interval equivalence. Machine and sample calibration was undertaken using a synthetic glass standard and XRF fused glass discs from the core at the start and end of each core-site run. Raw count per second (cps) data were analysed using the Q-spec spectra matching software (Cox Analytical). Data are presented as percentages of the total scatter-normalised sum, following established total-scatter normalisation procedures (Kylander et al., 2011; Davies et al., 2015), rather than equivalent whole-rock percentages. The uppermost sediments were flocculent and could not be preserved intact for scanning. Magnetic susceptibility (MS) (Bartington Instruments MS2G 1 cm loop sensor, 10 s) was measured with a GEOTEK core logger using standard calibration procedures (Gunn and Best, 1998). Sediments were placed in 5% HCl to remove any CaCO3, then washed over Whatman 41 filter papers with deionised water and dried at 40degC in a drying cabinet. Carbon isotope ratios (delta13C), percentage total organic carbon (%TOC) and percentage total nitrogen (%TN were analysed during combustion in a Carlo Erba 1500 on<line to a VG Triple Trap and dual inlet mass spectrometer. delta13C values were converted to the VPDB scale using a within-run laboratory standard calibrated against NBS-19 and NBS-22, with C&N calibrated against an Acetanilide standard. Replicate analysis of sample material indicated a precision of ±0.1per mille for delta13C and ±0.1 for C&N. Detailed methodology can be found in Perren et al. (in review) Details on acronyms used in the ITRAX xrf data: o Kcps: (Kilo) counts per second o MSE: Mean Square Error o TSN:Total Scatter Normalized o Mo=Mo-tube µ-XRF data o inc.=incoherent scatter o coh.=coherent scatter o inc.+coh.=total scatter o El= element o PC: Principal Component asNeeded completed