Abstract:
This dataset consists of measurements of cosmogenic 10Be in quartz from a set of erratic cobbles collected from the surfaces of nunataks in West Antarctica. The cobbles were collected during the 2019-20 Antarctic field season from the Hudson Mountains, which are situated adjacent to Pine Island Glacier. The dataset includes cosmogenic nuclide (10Be) exposure ages and all field (sample locations and elevations) and analytical laboratory (quartz and beryllium carrier masses, Be-10/Be-9 ratios) data for field samples and procedural blanks required to calculate the ages.
Natural Environment Research Council (NERC: Grants NE/S006710/1, NE/S006753/1, and NE/S00663X/1) and National Science Foundation (NSF: Grant OPP 2317097). Australian Nuclear Science and Technology Organisation (ANSTO) Centre for Accelerator Science award AP12872, through the National Collaborative Research Infrastructure Strategy (NCRIS).
Keywords:
Antarctica, Cosmogenic nuclides, Glacial geology, Holocene, Pine Island Glacier, Surface exposure ages
Nichols, K., Rood, D., Wilcken, K., & Johnson, J. (2023). Cosmogenic Be-10 data and calculated surface exposure ages from nunataks adjacent to Pine Island Glacier in the Hudson Mountains, West Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/9ddd50c8-cd08-4afe-b245-f6891f1d9a3f
| Access Constraints: | No restrictions apply |
|---|---|
| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) |
| Creation Date: | 2023-07-09 |
|---|---|
| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
|
| Parameters: |
|
| Personnel: | |
| Name | UK Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Keir A Nichols |
| Role(s) | Investigator, Technical Contact |
| Organisation | Imperial College London |
| Name | Dylan H Rood |
| Role(s) | Investigator |
| Organisation | Imperial College London |
| Name | Klaus Wilcken |
| Role(s) | Investigator |
| Organisation | Australian Nuclear Science and Technology Organisation |
| Name | Joanne S Johnson |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Associated publication: Keir A. Nichols, Dylan H. Rood, Ryan A. Venturelli, Greg Balco, Jonathan R. Adams, Louise Guillaume, Seth Campbell, Brent M. Goehring, Brenda L. Hall, Klaus Wilcken, John Woodward, Joanne S. Johnson; Offshore-onshore record of Last Glacial Maximum-to-present grounding line retreat at Pine Island Glacier, Antarctica. Geology 2023; 51 (11): 1033-1037. doi: https://doi.org/10.1130/G51326.1 Methodology References: Balco, G., Stone, J.O., Lifton, N.A., and Dunai, T.J., 2008, A complete and easily accessible means of calculating surface exposure ages or erosion rates from 10Be and 26Al measurements: Quaternary Geochronology, v. 3, p. 174-195, doi:10.1016/j.quageo.2007.12.001. Corbett, L.B., Bierman, P.R., Rood, D.H., 2016. Constraining multi-stage exposure- burial scenarios for boulders preserved beneath cold-based glacial ice in Thule, northwest Greenland. Earth Planet Sci. Lett. 440, 147-157. Kohl, C.P., Nizhiizumi, K., 1992. Chemical isolation of quartz for measurement of in-situ -produced cosmogenic nuclides. Geochim Cosmochim Acta 56, 3583-3587. Nishiizumi, K., Imamura, M., Caffee, M.W., Southon, J.R., Finkel, R.C., McAninch, J., 2007. Absolute calibration of 10Be AMS standards. Nucl. Instrum. Methods B 258, 403-413. Wilcken, K.M., Fink, D., Hotchkis, M., Garton, D., Button, D., Mann, M., Kitchen, R., Hauser, T., O'Connor, A., 2017. Accelerator mass spectrometry on SIRIUS: new 6MV spectrometer at ANSTO. Nucl. Instrum. Methods B 406, 278-282. |
|
|---|---|---|
| Quality: | Quartz purity was tested using inductively coupled plasma optical emission spectrometry (ICP-OES). For isotope dilution chemistry, a procedural blank (beryllium carrier processed with no quartz) was processed for every 11 samples, resulting in 13 total procedural blanks. This dataset of blank measurements includes those from batches of other samples processed during the same few months as those in this study. We also processed two replicate measurements and one aliquot of the laboratory intercomparison material CRONUS A. In the file titled 'Analytical data and exposure ages', there is no value in the column titled 'Mass carrier (g)' for sample EVK-102 (BAS ID R19.4.2). This is because EVK-102 contains native Be, so the total Be (in mg) was quantified using ICP-OES analysis. | |
| Lineage: | Samples (erratic cobbles perched on presently-exposed mountain peaks next to Pine Island Glacier) were collected by Dr Joanne S Johnson (British Antarctic Survey) during the 2019-20 austral summer. Latitude, altitude, and elevation measurements of the location of the samples were made using a Javad Triumph II GPS receiver. The sample heights above ellipsoid were corrected to orthometric heights (height above geoid EGM08 in metres above sea level) using Precise Point Positioning software. Laboratory chemistry was conducted in the CosmIC Laboratory at Imperial College London. Quartz purification followed the methods of Kohl and Nishiizumi (1992). Isotope dilution chemistry and beryllium purification used the methods of Corbett et al. (2016). Be-10/Be-9 ratios were measured by accelerator mass spectrometry at ANSTO using the methods of Wilcken et al. (2017) and normalised to the standard values of Nishiizumi et al. (2007). Laboratory data were then converted to Be-10 concentrations and, finally, exposure ages using an online exposure age calculator (Balco et al., 2008). Exposure ages were calculated using the default global production rate and two different cosmogenic nuclide scaling methods (known as St and LSDn). | |
| Temporal Coverage: | |
|---|---|
| Start Date | 2019-11-28 |
| End Date | 2019-12-12 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -74.9054 |
| Northernmost | -74.8247 |
| Longitude | |
| Westernmost | -100.4182 |
| Easternmost | -98.7478 |
| Altitude | |
| Min Altitude | 173 |
| Max Altitude | 779 |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Pine Island Glacier |
| Location | Antarctica |
| Detailed Location | Hudson Mountains |
| Location | Antarctica |
| Detailed Location | West Antarctica |
| Location | Antarctica |
| Detailed Location | Evans Knoll |
| Location | Antarctica |
| Detailed Location | Winkie Nunatak |
| Location | Antarctica |
| Detailed Location | Shepherd Dome |
| Location | Antarctica |
| Detailed Location | Inman Nunatak |
| Location | Antarctica |
| Detailed Location | Meyers Nunatak |
| Location | Antarctica |
| Detailed Location | Amundsen Sea |
| Data Collection: | Exposure ages were calculated using version 3 of the online exposure age calculators available at http://hess.ess.washington.edu. Javad Triumph II GPS receiver Precise Point Positioning software |
|---|
| Distribution: | |
|---|---|
| Distribution Media | N/A |
| Distribution Size | 3 x csv |
| Distribution Format | N/A |
| Fees | N/A |