Date (Creation)

2023-06-29

Date (Revision)

2023-06-29

Date (Publication)

2023-06-29

Date (released)

2023-06-29

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/e8198dd3-ea60-4a4c-9975-d9c1695820fe

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01753

Codespace

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

Unique resource identifier

NE/S006664/1

Codespace

award

Other citation details

Please cite this item as: Hillenbrand, C., & Ehrmann, W. (2023). Clay mineral composition of seafloor surface sediments from the Amundsen Sea continental shelf, West Antarctica (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e8198dd3-ea60-4a4c-9975-d9c1695820fe

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Hillenbrand, Claus-Dieter		Author
Leipzig University	Ehrmann, Werner		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 > Oceans > Marine Sediments

Theme

• Amundsen Sea

• Clay minerals

• International Thwaites Glacier Collaboration (ITGC)

• Thwaites Offshore Research (THOR)

Place

• Amundsen Sea Core

GEMET - INSPIRE themes, version 1.0

• Oceanographic geographical features

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 dataset is under embargo until December 2025, when it will be made freely available. Before the end of the embargo, referees may access the dataset for review purposes using a login and password provided by the PDC.

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

2019-02-09

End date

2019-03-13

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:

The sediments were recovered with a mega-corer (MC), box corer (BC), kasten corer (KC) or jumbo gravity corer (JGC) on the Amundsen Sea continental shelf in the vicinity of Thwaites Glacier and Pine Island Glacier. Sediment cores were collected during cruises NBP1902 (Jan-Mar 2019) and NBP2002 (Jan-Mar 2020) with RV/IB Nathaniel B. Palmer.

The clay fraction (less than 2 micrometers) was separated from the bulk sediment in settling tubes, and 40 mg clay suspension was mixed with 1 ml of an internal standard (0.04 percent MoS2 suspension). The samples were then mounted as texturally oriented aggregates by rapidly filtering the suspension through a membrane filter (0.20 micrometer pore width). The filter cakes were dried at 50 degrees Celsius, fixed on aluminium tiles and exposed to ethylene glycol vapour at a temperature of 60 degrees Celsius for at least 18 h immediately before the X-ray analyses. The measurements were conducted on a diffractometer system Rigaku New Miniflex with Cobalt K-alpha radiation (30 kV, 15 mA). First, the samples were X-rayed in the range 3-40 degree2theta, with a step size of 0.02 degree2theta and a measuring time of two seconds per step. Then, the range 27.5-30.6 degree2theta was X-rayed with a step size of 0.01 degree 2 theta and a measuring time of four seconds per step in order to better resolve the (002) peak of kaolinite and the (004) peak of chlorite. The X-ray diffractograms were evaluated using the interactive ''MacDiff'' software (Petschick 2010, Petschick et al. 1996). The main clay mineral groups were identified by their basal reflections at 16.5 Angstrom (smectite, after glycolisation), 10 and 5 Angstrom (illite), 14.2, 7, 4.72 and 3.54 Angstrom (chlorite), and 7 and 3.58 Angstrom (kaolinite) after the diffractograms had been adjusted to the MoS2 peak at 6.15 Angstrom. For semi-quantitative evaluations of the clay mineral assemblages, empirically estimated weighting factors on the integrated peak areas of the individual clay mineral reflections were used (Biscaye 1964, 1965).

Data collection:

A diffractometer system, Rigaku New Miniflex with Cobalt-K-alpha radiation (30 kV, 15 mA), was used for the X-raying.

The diffractograms were analysed with the interactive ''MacDiff'' (v. 4.2.5) software (Petschick 2010).

Data quality:

By preparing, analysing and evaluating samples six times, a standard deviation of c. 1 percentage was obtained for the concentrations of smectite, chlorite and kaolinite, and of c. 1.5 percentage for illite.

Metadata

File identifier

e8198dd3-ea60-4a4c-9975-d9c1695820fe XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2023-06-29

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