Full Record - Geochronological data from the Hudson Mountains, Antarctica

Geochronological data from the Hudson Mountains, Antarctica

GB/NERC/BAS/PDC/02044

Abstract:
Geological fieldwork was carried out in the Hudson Mountains during the 2005/6 and 2019/20 Antarctic summers to help understand the glacial history of the Pine Island Glacier region of West Antarctica. To accurately determine the crystallisation age of a suite of granitoid glacial erratics, we conducted a detailed analysis of zircon U-Pb geochronology. The dataset here provides U-Pb zircon geochronology data for 10 rock samples, collected from the Hudson Mountains. The data were collected in November 2024 at University College London. The analyses were conducted by Andrew Carter (University College London).
This work was funded by NERC grant (NE/S006710/1) to Joanne Johnson.

Citation:
Riley, T., Carter, A., & Johnson, J. S. (2025). Geochronological data from the Hudson Mountains, Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/8f999423-ff40-4181-bdf3-964a7e145772

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https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=8f999423-ff40-4181-bdf3-964a7e145772

License

Access:	No restrictions apply.
Use:	This data is governed by the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy/) and supplied under Open Government Licence v.3 (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).

Authors

Name	UK Polar Data Centre
Role(s)	Metadata Author
Organisation	British Antarctic Survey

Name	Teal R Riley
Role(s)	Investigator, Technical Contact
Organisation	British Antarctic Survey

Name	Andrew Carter
Role(s)	Investigator
Organisation	University College London

Name	Joanne S Johnson
Role(s)	Investigator
Organisation	British Antarctic Survey

Basic Information

Creation Date:	2025-04-10
Dataset Progress:	Planned
Dataset Language:	English
ISO Topic Categories:	Geoscientific Information
Parameters:	Land Surface > Geomorphology > Glacial Landforms/Processes

Additional Information

Reference:	Associated paper: Teal R. Riley, Andrew Carter, Morag A. Hunter, Ian L. Millar, Michael J. Flowerdew, Michael L. Curtis, Dominic A. Hodgson; Provenance and correlation of Permian successions from the Falkland/Malvinas Islands with West Gondwana: implications for a Natal Embayment palaeo-location. Journal of the Geological Society 2025;; 182 (4): jgs2024-282. doi: https://doi.org/10.1144/jgs2024-282 References: Ludwig, K. R. (2012). User manual for Isoplot 3.75-4.15: a geochronological toolkit for Microsoft Excel. Berkeley Geochronology Centre Special Publications 5. Slama, J., Kosler, J., Condon, D. J., Crowley, J. L., Gerdes, A., Hanchar, J. M., Horstwood, M. S. A., Morris, G. A., Nasdala, L., Norberg, N., Schaltegger, U., Schoene, B., Tubrett, M. N., & Whitehouse, M. J. (2008). Plesovice zircon - a new natural reference material for U-Pb and Hf isotopic microanalysis. Chemical Geology, 249 (1-2), 1-35. Vermeesch, P. (2018). IsoplotR: a free and open toolbox for geochronology. Geoscience Frontiers, 9, 1479-1493. https://doi.10.1016/j.gsf.2018.04.001.
Quality:	U-Pb ages were calculated using the 206Pb/238U ratios for samples dated as <1.1 Ga, and the 207Pb/206Pb ratios was used for older grains. Discordance was determined using (207Pb/235U - 206Pb/238U) / 206Pb/238U) and similar for 207Pb/206Pb ages.
Lineage/Methodology:	Geological fieldwork was carried out in the Hudson Mountains during the 2005/6 and 2019/20 Antarctic summers. The crystallization age of 10 samples from these expeditions were analysed using zircon U-Pb geochronology. Zircon U-Pb geochronology used laser ablation inductively coupled mass spectrometry (LA-ICP-MS) facilities (Agilent 7700 coupled to a New Wave Research 193 nm excimer laser) at the London Geochronology Centre based in University College London. Heavy minerals were separated from bulk sediment samples using standard density liquid and magnetic separation procedures. Zircon-enriched extracts were mounted in hard epoxy resin on glass slides and polished for analysis.Typical laser spot sizes of 25 µm were used with a 7-10 Hz repetition rate and a fluence of 2.5 J/cm2. Background measurement before ablation lasted 15 seconds and laser ablation dwell time was 25 seconds. The external zircon standard was Plesovice, which has a TIMS reference age 337.13 ± 0.37 Ma (Sláma et al., 2008). Standard errors on isotope ratios and ages include the standard deviation of 206Pb/238U ages of the Plesovice standard zircon.Time-resolved signals that record isotopic ratios with depth in each crystal were processed using GLITTER 4.5, data reduction software, developed by the ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC) at Macquarie University and CSIRO Exploration and Mining. Processing enabled filtering to remove spurious signals owing to overgrowth boundaries, weathering, inclusions, or fractures.

Extent

Temporal Coverage:
Start Date	2024-11-01
End Date	2024-11-30

Spatial Coverage:
Latitude
Southernmost	-74.8619
Northernmost	-74.8619
Longitude
Westernmost	-99.7777
Easternmost	-99.7777
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.8472
Northernmost	-74.8472
Longitude
Westernmost	-100.4114
Easternmost	-100.4114
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.8803
Northernmost	-74.8803
Longitude
Westernmost	-99.5353
Easternmost	-99.5353
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.825
Northernmost	-74.825
Longitude
Westernmost	-98.877
Easternmost	-98.877
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.9053
Northernmost	-74.9053
Longitude
Westernmost	-98.75
Easternmost	-98.75
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.7775
Northernmost	-74.7775
Longitude
Westernmost	-99.3672
Easternmost	-99.3672
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.776
Northernmost	-74.776
Longitude
Westernmost	-99.3595
Easternmost	-99.3595
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.786
Northernmost	-74.786
Longitude
Westernmost	-98.6362
Easternmost	-98.6362
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.5431
Northernmost	-74.5431
Longitude
Westernmost	-98.3309
Easternmost	-98.3309
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.5424
Northernmost	-74.5424
Longitude
Westernmost	-98.3271
Easternmost	-98.3271
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.4612
Northernmost	-74.4612
Longitude
Westernmost	-99.09
Easternmost	-99.09
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Latitude
Southernmost	-74.4606
Northernmost	-74.4606
Longitude
Westernmost	-99.0927
Easternmost	-99.0927
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	N/A
Max Depth	N/A

Location:
Location	Antarctica
Detailed Location	Evans Knoll, Hudson Mountains
Location	Antarctica
Detailed Location	Winkie Nunatak, Hudson Mountains
Location	Antarctica
Detailed Location	Shepherd Dome, Hudson Mountains
Location	Antarctica
Detailed Location	Inman Nunatak, Hudson Mountains
Location	Antarctica
Detailed Location	Meyers Nunatak, Hudson Mountains
Location	Antarctica
Detailed Location	St Manthe, Hudson Mountains
Location	Antarctica
Detailed Location	Wold Nunatak, Hudson Mountains
Location	Antarctica
Detailed Location	Siren Rock, Hudson Mountains
Location	Antarctica
Detailed Location	Slusher Nunatak, Hudson Mountains

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