Identification

Title

Clay Mineralogy of Miocene to recent sediments collected at Site U1521 during International Ocean Discovery Programme (IODP) Expedition 374 to the Ross Sea, Antarctica

Abstract

This dataset comprises 35 samples analysed for clay mineralogy from IODP Expedition 374 Site U1521 to the Ross Sea, collected on the RV JOIDES Resolution. Shipboard biostratigraphy and magnetostratigraphy suggests the samples are mainly early Miocene in age (McKay et al., 2019, Proceedings of the International Ocean Discovery Program). The uppermost samples do, however, include younger Plio-Pleistocene sediments.

Resource type

dataset

Resource locator

https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item166006

name: Data

function: download

https://doi.org/10.5285/b3cb3574-49b0-44c8-a934-3da88ca4ef93

name: Digital Object Identifier (DOI)

function: information

Unique resource identifier

code

http://data.bgs.ac.uk/id/dataHolding/13607798

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

GEMET - INSPIRE themes

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Sedimentary history

Miocene

Provenance

Clay mineralogy

originating controlled vocabulary

title

BGS Thesaurus of Geosciences

reference date

date type

revision

effective date

2011

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

-179.6700

East bounding longitude

-179.6800

North bounding latitude

-75.6700

South bounding latitude

-75.6800

Extent

Extent group

authority code

title

British Geological Survey Gazetteer: Gazetteer of sea areas

reference date

date type

revision

effective date

2010

code identifying the extent

ROSS SEA [id=2001391]

Temporal reference

Temporal extent

Begin position

2019-09

End position

2019-11

Dataset reference date

date type

creation

effective date

2021-05-19

Frequency of update

notApplicable

Quality and validity

Lineage

Samples were first decarbonated using 0.1N HCl and deflocculated through repeated washing using pure water. To isolate the clay-size fraction (<2 µm), differential settling was employed according to Stoke’s Law and then the sample was concentrated using a centrifuge for 40 minutes at 3500 rotations per minute. An aliquot was then placed on glass slides, before X-ray diagrams were obtained using a Bruker D4Endeavor (standard 30 kV and 30 mA). Each sample was run between 2.49 and 32.5°2θ with a step size of 0.08°2θ (total of 369 steps) and integration time of one second. Sample were run in three different ways: 1) air-dried, 2) glycolated (12 hours in ethylene glycol), and 3) heated at 490°C for 2 hours . The relative fraction of smectite, chlorite, illite and kaolinite is determined using the main X-ray diffraction peaks (layer and interlayer) on X-ray spectra according to their crystallographic characteristics (Beny et al., 2020, QSR). Illite is readily identified using its main peak at 10 Å on all three runs. Smectite is characterized by a main peak at 14-15 Å on the air-dried samples that expands at 17 Å after ethylene glycol saturation and collapses at 10 Å with increasing heating. Kaolinite and chlorite both have a dominant peak at 7-7.2 Å, with pseudo-void deconvolution of the kaolinite/chlorite doublet at 3.54/3.58 Å required to distinguish between them. All measurements and semi-quantitative estimations are processed using the MacDiff software (Petschick, 2004). To distinguish between Fe/ Mg-rich vs Al-rich illite, the Esquevin index was also employed (Esquevin, 1969), which corresponds to the ratio between the intensity of the peak of illite at 5 Å and at 10 Å (illite 5Å/10Å). The crystallinity of illite was measured using the method of integral breadth (Petschick et al., 1996, Marine Geol.), with high crystallinity implying poorly crystallized mineral.

Conformity

Conformity report

specification

title

INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Data format

name of format

csv file

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Responsible organisations

Responsible party

contact position

Research Postgraduate

organisation name

Imperial College London

full postal address

Royal School of Mines, Prince Consort Road

London

SW7 2BP

email address

not available

responsible party role

originator

Responsible party

organisation name

University of Lille

email address

not available

responsible party role

originator

Responsible party

organisation name

University of Lille

email address

not available

responsible party role

owner

Responsible party

organisation name

British Geological Survey

email address

not available

responsible party role

distributor

Responsible party

organisation name

British Geological Survey

email address

not available

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Environmental Science Centre,Keyworth

NOTTINGHAM

NG12 5GG

United Kingdom

telephone number

+44 115 936 3100

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2022-05-18

Metadata language

eng