Object # PRR-60755: Core
| Primary Field # | RB-2-000-003 |
| IGSN # | PRR060755 |
| Kind of Object | Core |
| Rock Type | Igneous |
| Rock Name | Granite |
| Alternative Rock Name | A-type Granite |
| Sample Description | Lithology is A-type granite similar in composition to bedrock exposed on nearby Harter Nunatak and other mountains in the Pirrit Hills. Slightly peraluminous A-type granite; alkali feldspar, quartz, plagioclase with minor biotite and muscovite. [2 pieces; cored at 0m for analyses; small green deposit on top] |
| Weight | 80 g |
| Susceptibility | 404 x10-5 SI units |
| General Notes | This data set contains measurements of cosmic-ray-produced Be-10 and Al-26 in quartz from the RB-2 core, recovered from bedrock at a depth of 150 m below the West Antarctic Ice Sheet surface in the Pirrit Hills. The core site is located at latitude S81.09948, longitude W85.15694. Core length is approximately 8 meters. Lithology is A-type granite, similar in composition to bedrock exposed on nearby Harter Nunatak and other mountains in the Pirrit Hills (Lee, H. M., Lee, J. I., Lee, M. J., Kim, J., & Choi, S. W. (2012). The A-type Pirrit Hills Granite, West Antarctica: an example of magmatism associated with the Mesozoic break-up of the Gondwana supercontinent. Geosciences Journal, 16, 421-433). Samples were processed at the University of Washington Cosmogenic Nuclide Laboratory. Chemical processing and purification methods are described at http://depts.washington.edu/cosmolab/chem.shtml. Beryllium isotope ratios were measured at the Lawrence Livermore Center for Accelerator Mass Spectrometry (LLNL-CAMS) relative to the KNSTD-Be-01-5-4 standard, assuming a standard Be-10/Be-9 ratio of 2.851E-12 (07KNSTD normalization). Aluminum isotope ratios were measured at PRIME Lab, Purdue University, relative to the KNSTD-Al-01-5-2 standard, assuming a standard Al-26/Al-27 ratio of 1.818E-12 (KNSTD normalization). Uncertainties are 1-sigma and include full AMS errors and all known sources of laboratory uncertainty. |
| Continent | Antarctica |
| Region | Ellsworth-Whitmore Mountains |
| Mountain Range/Island Group | Pirrit Hills |
| Mountain/Island Name | Harter Nunatak |
| Coordinates | -81.099480, -85.156940 (81° 6' S, 85° 9.4' W) |
| Positioning Method | GPS |
| Elevation (ASL) | 1139.7 m |
| Era | Mesozoic |
| Period | Jurassic |
| Epoch | Middle |
| Stage | Callovian |
| Analyses | Cosmogenic dating |
| Additional Material | Reference Exposure data available on ICE-D database |
| Primary Field Logistics | LC-130 |
| Secondary Field Logistics | Twin Otter |
| Data Sources | ICE-D database Publication |
| Date Collected | 2017-01-14 |
| Field Year Collected | 2017 |
| Collector | Stone, John O. |
| Donor | Stone, John O. |
| Coring Site | RB-2 |
| Depth to top (mbs) | 0 |
| Depth to bottom (mbs) | 0.03 |
| Coring Device | Rotary wireline core using IDP ASIG drill |
| References | https://www.usap-dc.org/view/dataset/601214 Kuhl, T., Gibson, C., Johnson, J., Boeckmann, G., Moravec, E., & Slawny, K. (2021). Agile Sub Ice Geological (ASIG) Drill development and Pirrit Hills field project. Annals of Glaciology, 62(84), 53-66. doi:10.1017/aog.2020.59 https://version2.ice-d.org/antarctica/core/RB-2/ Spector, P., Stone, J., Pollard, D., Hillebrand, T., Lewis, C., and Gombiner, J.: West Antarctic sites for subglacial drilling to test for past ice-sheet collapse, The Cryosphere, 12, 2741-2757, https://doi.org/10.5194/tc-12-2741-2018, 2018. |
If you would like a 3D scan of this sample, please contact the Curator.
Cite as:
The Polar Rock Repository (PRR), Byrd Polar and Climate Research Center (BPCRC), Ohio State University: Polar rock and dredge samples available for research and educational use from the PRR.
doi:10.7289/V5RF5S18 [date of access]
