Date (Creation)

2023-05-25

Date (Revision)

2023-05-25

Date (Publication)

2023-05-25

Date (released)

2023-05-25

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/f4f0c90e-7ed6-46f4-8973-dd4475c5dcde

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01744

Codespace

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

Other citation details

Please cite this item as: Riley, T. (2023). Geochemical and geochronological data from the Fossil Bluff Group, Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/f4f0c90e-7ed6-46f4-8973-dd4475c5dcde

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

Theme

• geochemistry

• geochronology

• provenance

• zircon

Place

• Alexander Island Antarctica

GEMET - INSPIRE themes, version 1.0

• Geology

Access constraints

Other restrictions

Other constraints

no limitations to public access

Access constraints

Other restrictions

Other constraints

no limitations

Use constraints

License

Other constraints

Open Government Licence v3.0

Use constraints

Other restrictions

Other constraints

Data supplied under Open Government Licence v3.0

Use constraints

Other restrictions

Other constraints

No restrictions apply.

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

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

2022-09-01

End date

2023-01-30

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:

NORDSIM analytical facility (Stockholm)

Zircons were separated and concentrated from rock samples (sample_information.csv) 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 NordSIM facility housed at the Swedish Museum of Natural History in Stockholm. The analytical method closely followed Whitehouse & 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 homogenise beam density, the final analytical spot size being ca. 15 micrometers in diameter. Sputtered secondary ions introduced into the mass spectrometer were analysed 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 and 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). The results and standard information are presented in U-Pb_data.csv and U-Pb_standards.csv.

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 micrometers 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. Ages were calculated using the 206Pb/238U ratios for samples dated as less than 1.1 Ga, and the 207Pb/206Pb ratios was used for older grains. Discordance was determined using (207Pb/235U - 206Pb/...(39)

Data collection:

CAMECA 1280 ion microprobe at the NordSIM facility

SEM using a cathodoluminescence (CL) detector

Isoplot v. 4.15 (Ludvig, 2012)

Data was processed using software by Vermeesch (2021)

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

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

Data quality:

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. Epsilon-Hf values were calculated using a 176Lu decay constant of 1.867 x 10-11y-1 (Soderlund 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

f4f0c90e-7ed6-46f4-8973-dd4475c5dcde XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2023-05-25

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