e8198dd3-ea60-4a4c-9975-d9c1695820fe 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 2023-06-29 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 Clay mineral composition of seafloor surface sediments from the Amundsen Sea continental shelf, West Antarctica 2023-06-29 creation 2023-06-29 revision 2023-06-29 publication 2023-06-29 released 1.0 https://doi.org/10.5285/e8198dd3-ea60-4a4c-9975-d9c1695820fe doi GB/NERC/BAS/PDC/01753 https://data.bas.ac.uk/ NE/S006664/1 award Please cite this item as: Hillenbrand, C., & Ehrmann, W. (2023). Clay mineral composition of seafloor surface sediments from the Amundsen Sea continental shelf, West Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e8198dd3-ea60-4a4c-9975-d9c1695820fe This data set presents contents of the clay minerals smectite, illite, chlorite and kaolinite analysed on the clay fraction (<2 micrometer) of seafloor surface sediments. The sediments were recovered with a mega-corer (MC), box corer (BC), kasten corer (KC) or jumbo gravity corer (JGC) on the Amundsen Sea continental shelf in the vicinity of Thwaites Glacier and Pine Island Glacier. Sediment cores were collected during cruises NBP1902 (Jan-Mar 2019) and NBP2002 (Jan-Mar 2020) with RV/IB Nathaniel B. Palmer as part of the Thwaites Offshore Research (THOR) project on behalf of the International Thwaites Glacier Collaboration (ITGC) programme. The clay mineral contents are given in percentages and subbottom depth in centimetres (cm). NERC grant NE/S006664/1 and NSFPLR grant no. 1738942. This data was collected as part of the NERC-NSF funded International Thwaites Glacier Collaboration (ITGC) program. No credit. completed Hillenbrand, Claus-Dieter British Antarctic Survey Researcher author Ehrmann, Werner Leipzig 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 > Oceans > Marine Sediments 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 Amundsen Sea Clay minerals International Thwaites Glacier Collaboration (ITGC) Thwaites Offshore Research (THOR) theme Amundsen Sea Core place Oceanographic geographical features 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 dataset is under embargo until December 2025, when it will be made freely available. Before the end of the embargo, referees may access the dataset for review purposes using a login and password provided by the PDC. url url crossReference textTable eng utf8 geoscientificInformation -107.8639 -100.5979 -75.11329 -73.80046 2019-02-09 2019-03-13 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 3072 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e8198dd3-ea60-4a4c-9975-d9c1695820fe WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The sediments were recovered with a mega-corer (MC), box corer (BC), kasten corer (KC) or jumbo gravity corer (JGC) on the Amundsen Sea continental shelf in the vicinity of Thwaites Glacier and Pine Island Glacier. Sediment cores were collected during cruises NBP1902 (Jan-Mar 2019) and NBP2002 (Jan-Mar 2020) with RV/IB Nathaniel B. Palmer. The clay fraction (less than 2 micrometers) was separated from the bulk sediment in settling tubes, and 40 mg clay suspension was mixed with 1 ml of an internal standard (0.04 percent MoS2 suspension). The samples were then mounted as texturally oriented aggregates by rapidly filtering the suspension through a membrane filter (0.20 micrometer pore width). The filter cakes were dried at 50 degrees Celsius, fixed on aluminium tiles and exposed to ethylene glycol vapour at a temperature of 60 degrees Celsius for at least 18 h immediately before the X-ray analyses. The measurements were conducted on a diffractometer system Rigaku New Miniflex with Cobalt K-alpha radiation (30 kV, 15 mA). First, the samples were X-rayed in the range 3-40 degree2theta, with a step size of 0.02 degree2theta and a measuring time of two seconds per step. Then, the range 27.5-30.6 degree2theta was X-rayed with a step size of 0.01 degree 2 theta and a measuring time of four seconds per step in order to better resolve the (002) peak of kaolinite and the (004) peak of chlorite. The X-ray diffractograms were evaluated using the interactive ''MacDiff'' software (Petschick 2010, Petschick et al. 1996). The main clay mineral groups were identified by their basal reflections at 16.5 Angstrom (smectite, after glycolisation), 10 and 5 Angstrom (illite), 14.2, 7, 4.72 and 3.54 Angstrom (chlorite), and 7 and 3.58 Angstrom (kaolinite) after the diffractograms had been adjusted to the MoS2 peak at 6.15 Angstrom. For semi-quantitative evaluations of the clay mineral assemblages, empirically estimated weighting factors on the integrated peak areas of the individual clay mineral reflections were used (Biscaye 1964, 1965). Data collection: A diffractometer system, Rigaku New Miniflex with Cobalt-K-alpha radiation (30 kV, 15 mA), was used for the X-raying. The diffractograms were analysed with the interactive ''MacDiff'' (v. 4.2.5) software (Petschick 2010). Data quality: By preparing, analysing and evaluating samples six times, a standard deviation of c. 1 percentage was obtained for the concentrations of smectite, chlorite and kaolinite, and of c. 1.5 percentage for illite. asNeeded completed