cb799ce3-e1e3-40c6-e054-002128a47908 English dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-05-03 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13607798 WGS 84 (EPSG::4326) Clay Mineralogy of Miocene to recent sediments collected at Site U1521 during International Ocean Discovery Programme (IODP) Expedition 374 to the Ross Sea, Antarctica 2021-05-19 creation http://data.bgs.ac.uk/id/dataHolding/13607798 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. James Marschalek Imperial College London Research Postgraduate Royal School of Mines, Prince Consort Road London SW7 2BP not available originator Viviane Bout-Roumazeilles University of Lille not available originator Francois Beny University of Lille not available owner Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/cb799ce3-e1e3-40c6-e054-002128a47908.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Sedimentary history Miocene Clay mineralogy Provenance BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data Citable Data dataCentre NERC_DDC otherRestrictions restricted The dataset has been formally approved by BGS for access by external clients under a BGS Digital Data Licence, issued via BGS's IPR Section. The dataset must not be provided to, or be accessible by, an external client until the IPR Section confirms that signed licence documentation is in place. Refer to the IPR Section (DigitalLE@bgs.ac.) if further advice is required.. Constraint applies until 2022-12-31 otherRestrictions 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. Either: (i) the dataset is made freely available, e.g. via the Internet, for a restricted category of use (e.g. educational use only); or (ii) the dataset has not been formally approved by BGS for access and use by external clients under licence, but its use may be permitted under alternative formal arrangements; or (iii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted in order to determine the permitted usage of the dataset. Refer to the BGS staff member responsible for the creation of the dataset if further advice is required. He / she should be familiar with the composition of the dataset, particularly with regard to 3rd party IPR contained in it, and any resultant use restrictions. This staff member should revert to the IPR Section (ipr@bgs.ac.uk) for advice, should the position not be clear. vector English geoscientificInformation British Geological Survey Gazetteer: Gazetteer of sea areas 2010 revision ROSS SEA [id=2001391] -179.6700 -179.6800 -75.6800 -75.6700 2019-09 2019-11 Comma-separated values (CSV) witheld Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item166006 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/b3cb3574-49b0-44c8-a934-3da88ca4ef93 WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) information dataset dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false 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 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false 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.