Date (Creation)

2025-09-30

Date (Revision)

2025-09-30

Date (Publication)

2025-09-30

Date (released)

2025-09-30

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/270714e6-f141-4c01-8a13-2bdfaca80ced

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/02087

Codespace

https://data.bas.ac.uk/

Other citation details

Please cite this item as: Riley, T. (2025). Geochemical and geochronological data from the Drygalski Fjord region of South Georgia (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/270714e6-f141-4c01-8a13-2bdfaca80ced

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Riley, Teal		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency

As needed

Maintenance note

Completed

Global Change Master Directory (GCMD) Science Keywords

• EARTH SCIENCE > Solid Earth > Geochemistry > Isotopes

Theme

• Geochemistry

• Geochronology

• Provenance

• Zircon

Place

• Drygalski Fjord South Georgia Island

• Cooper Island South Georgia Island

• Salomon Glacier South Georgia Island

GEMET - INSPIRE themes, version 1.0

• Geology

Access constraints

Other restrictions

Other constraints

public access limited according to Article 13(1)(e) of the INSPIRE Directive

Use constraints

License

Other constraints

Open Government Licence v3.0

Use constraints

Other restrictions

Other constraints

This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/

Use constraints

Other restrictions

Other constraints

and supplied under Open Government Licence v.3 ().

Riley, T. (2025). Geochemical and geochronological data from the Drygalski Fjord region of South Georgia (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/270714e6-f141-4c01-8a13-2bdfaca80ced

Use constraints

Other restrictions

Other constraints

Data is under embargo until the publication of an associated manuscript

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Geoscientific information

Begin date

2023-11-01

End date

2024-03-31

Supplemental Information

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.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication)

2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier

urn:ogc:def:crs:EPSG::3031

Version

6.18.3

Hierarchy level

Dataset

Statement

Methodology:

Analytical methods

Zircon U-Pb geochronology was conducted at five separate laboratories.

University College London

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 mircometers 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 (Slama 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.

NordSIMS analytical facility (Stockholm)

Zircons were separated and concentrated from rock samples at the British Antarctic Survey, Cambridge. From the zircon concentrate, hand-picked grains were mounted in epoxy resin along with the Geostandards zircon 91500 (207Pb/206Pb age of 1065.4 +/- 0.3 Ma), which has reported U and Pb concentrations of 80 ppm and 15 ppm respectively (Wiedenbeck et al., 1995). The mount was polished to expose the centres of the grains and imaged by SEM using a cathodoluminescence (CL) detector in order to reveal their internal structure and guide analysis location. U-Pb ion-microprobe zircon geochronology was carried out using a CAMECA 1280 ion microprobe at the NordSIMS facility housed at the Swedish Museum of Natural History in Stockholm. The analytical method closely followed Whitehouse and Kamber (2005) but differs insomuch that the oxygen ion primary beam was generated using a high-brightness, radiofrequency (RF) plasma ion source (Oregon Physics, Hyperion II, rather than a duoplasmatron) and a focused beam instead of illuminated aperture. The 10 nA O2- beam was rastered over 5x5 micrometers to homogenize beam density, the final analytical spot size being ca. 15 micrometers in diameter. Sputtered secondary ions introduced into the mass spectrometer were analyzed using a single ion counting electron multiplier over 10 cycles of data. Data were reduced using in-house developed software. The power law relationship between 206Pb/238U16O and 238U16O2/238U16O measured from the 91500 standard was used to calibrate U/Pb ratios following the recommendations of Jeon and Whitehouse (2015). Common-Pb corrections were applied to analyses where statistically significant 204Pb was detected, using the present-day terrestrial common Pb estimate of Stacey & Kramers (1975). Terra-Wasserburg U-Pb concordia diagrams were drawn using Isoplot v. 4.15 (Ludwig, 2012). 207Pb corrected ages were calculated assuming non-radiogenic Pb was from surface contamination and had an isotopic composition of modern-day average terrestrial common Pb (207Pb/206Pb = 0.836; Stacey & Kramers 1975).

Lu-Hf isotope analysis

Isotope analyses were carried out at NIGL using a Thermo Scientific Neptune Plus MC-ICP-MS coupled to a New Wave Research UP193UC Excimer laser ablation system. Helium was used as the carrier gas through the ablation cell with Ar make-up gas being connected via a T-piece and sourced from a Cet...(17)

Data 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.

Lu_Hf analytical uncertainties for unknowns were propagated by quadratic addition to include the standard error of the mean of the analysis and the reproducibility of the 91500 reference material. epsilonHf values were calculated using a 176Lu decay constant of 1.867 x 10-11y-1 (Söderlund et al., 2004), the present-day chondritic 176Lu/177Hf value of 0.0336 and 176Hf/177Hf ratio of 0.282785 (Bouvier et al., 2008).

Metadata

File identifier

270714e6-f141-4c01-8a13-2bdfaca80ced XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2025-09-30

Metadata standard name

ISO 19115 Geographic Information - Metadata

Metadata standard version

ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact