Clay Mineralogy of Miocene to recent sediments collected at Site U1521 during International Ocean Discovery Programme (IODP) Expedition 374 to the Ross Sea, Antarctica
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.
dataset
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
http://data.bgs.ac.uk/id/dataHolding/13607798
eng
geoscientificInformation
publication
2008-06-01
NGDC Deposited Data
Sedimentary history
Miocene
Clay mineralogy
Provenance
revision
2022
NERC_DDC
-179.6700
-179.6800
-75.6700
-75.6800
revision
2010
ROSS SEA [id=2001391]
2019-09
2019-11
creation
2021-05-19
notApplicable
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.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
csv file
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.
Research Postgraduate
Imperial College London
Royal School of Mines, Prince Consort Road
London
SW7 2BP
originator
University of Lille
originator
University of Lille
owner
British Geological Survey
distributor
British Geological Survey
pointOfContact
British Geological Survey
Environmental Science Centre,Keyworth
NOTTINGHAM
NG12 5GG
United Kingdom
+44 115 936 3100
pointOfContact
2025-03-24