This data set contains site, sample, and analytical data from which to calculate cosmogenic nuclide-based exposure ages for glacial deposits adjacent to Reedy Glacier, Antarctica. The data are formatted as input for the CRONUS online exposure-age calculator (http://www.hess.ess.edu/), which determines the exposure age from the cosmogenic Beryllium-10 and Aluminum-26 production rates.
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Reedy Glacier Exposure Ages, Antarctica, Version 1
Geographic Coverage
Spatial Coverage: |
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Spatial Resolution: | Not Specified |
Temporal Coverage: |
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Temporal Resolution: | Not specified |
Parameter(s): |
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Platform(s) | FIELD SURVEYS |
Sensor(s): | GPS |
Data Format(s): |
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Version: | V1 |
Data Contributor(s): | John Stone |
Metadata XML: | View Metadata Record |
Data Citation
As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.
Stone, J. 2015. Reedy Glacier Exposure Ages, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5MG7MF1. [Date Accessed].Literature Citation
As a condition of using these data, we request that you acknowledge the author(s) of this data set by referencing the following peer-reviewed publication.
Todd, C. E., J. Stone, H. Conway, B. Hall, and G. R. Bromley. 2010. Late Quaternary evolution of Reedy Glacier, Antarctica, Quaternary Science Reviews. 29. 1328-1341.
Detailed Data Description
The samples used for this data set come primarily from glacial moraines and recessional deposits formed during the last glacial period (Marine Isotope Stage 2) and its termination. Geographical coverage extends from Cohen Nunatak at the northwest (lower) end of the glacier to Hatcher Bluffs at its head.The data are formatted as input for the CRONUS online exposure-age calculator, which determines the exposure age from the cosmogenic Be-10 and Al-26 production rates. Samples were collected during the 2003-04 and 2004-05 Antarctic field seasons, processed in the University of Washington Cosmogenic Nuclide Laboratory and analyzed for Be-10 at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry, and PRIME Lab, Purdue University.
Data are provided in a Microsoft Excel (.xlsx) file.
Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0601_stone directory. The worksheet contains the location information, density, sample thickness, shielding correction, Be-10, Al-26, and isostatic correction for Be-10 values for each sample.
The file size is 61 KB.
Southernmost Latitude: 86.51° S
Northernmost Latitude: 85.38° S
Westernmost Longitude: 124.48° E
Easternmost Longitude: 136.32° E
Paleo temporal coverage is from 20,000 B.P. to present.
Data were collected from 01 November 2003 through 31 January 2005.
Beryllium-10 (Be-10)
Aluminum-26 (Al-26) Analysis
Sample Data Record
Refer to Figure 1 for an example of the data.

Software and Tools
The data can be accessed using Microsoft Excel.
Data Acquisition and Processing
Samples were collected from 01 November 2003 through 31 January 2005. A hand-held GPS determined the geographic co-ordinates; altitudes were estimated from drift-corrected barometer traverses between reference sites where elevations were established with survey-grade GPS receivers. Elevations are in meters above sea level, and elevation uncertainties were estimated at less than ± 5 meters. Erosion rates were inferred to be zero based on sample surface preservation. Samples have been assigned a density of 2.7 g/cm3; actual densities were not measured. Actual density differences are likely to be small and have an effect of <1% on final exposure-age estimates.
Processing Steps
Beryllium was extracted and purified using conventional procedures (see: http://depts.washington.edu/cosmolab/chem/Al-26_Be-10.pdf). Be-10 was measured in clean quartz separates. Beryllium isotope ratios were measured relative to several different reference standards; Be-10 concentrations presented here have been corrected to a common basis relative to the KNSTD3110 standard (KNSTD-5-4) with an assumed Be-10/Be-9 ratio = 2.851*10-12. See Nishiizumi et al. (2007) and CRONUS calculator documentation: http://hess.ess.washington.edu/math/docs/al_be_v22/AlBe_standardization_table.pdf for further details.
References and Related Publications
Contacts and Acknowledgments
Dr. John Stone
University of Washington
Dept of Earth and Space Sciences
Box 351310
Seattle, Washington 98195-1310
This research was supported by NSF Division of Polar Programs, Grant Number OPP-0229314.
Document Information
Document Creation Date
22 January 2015
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