52a5d02f-b008-0057-e063-3050940a1a94 English dataset British Geological Survey (BGS) +44 (0)131 667 1000 +44 (0)131 668 4140 The Lyell Centre, Research Avenue South Edinburgh EH14 4AP UK enquiries@bgs.ac.uk pointOfContact 2026-06-25 MEDIN Discovery Metadata Standard Version 2.3.5 www.epsg.org 2005 revision urn:ogc:def:crs:EPSG::4326 OGP Natural Environment Research Council (NERC) Seabed Mining And Resilience To EXperimental impact JC241 SMARTEX: Pacific Ocean (04/Feb/2023 to 26/Mar/2023) 2023-03-26 publication BGS_CMD_REF1566 British Geological Survey This cruise is part of the Seabed Mining And Resilience To EXperimental impact (SMARTEX) project funded by the UK Natural Environment Research Council (Grant Reference NE/T003537/1). This is the second UK cruise to the Clarion Clipperton Zone (CCZ) in the northern equatorial Pacific, an area likely to be targeted for deep-sea mining for polymetallic nodules. The first (JC120) was carried out in 2015. Scientific aims: 1. Understand the remaining impact of a realistic mining test on the benthic environment and its fauna after 44 years; 2. Assess natural temporal change in macrofaunal communities between 1989 and 2023 (at PRA site); 3. Provide the first characterisation of megafaunal species and communities present at APEI-13 (linked outreach and policy interaction aim); 4. Characterise the environment and ecology of the UK-1 area in advance of a planned nodule collector test. BGS collected deep sea sediments and nodules during JC241. Porewaters were extracted for trace metals, nutrients and alkalinity. Sediments were analysed for trace element geochemistry, loss on drying, particle size analysis and bulk and clay mineralogy by XRD. Micro XRF and SEM imaging was used to image the geochemistry of entire nodule cross sections and laser ablation ICP-MS line transects were performed across selected entire nodules for high resolution geochemical profiles. Finally, physical property analysis of sediment collected during JC241 was utilised to model the physical and temporal response of deep-sea sediment to the compression caused by a deep-sea mining vessel. More information and the cruise report are available at www.bodc.ac.uk/resources/inventories/cruise_inventory/report/18136/. British Geological Survey (BGS) +44 (0)131 667 1000 +44 (0)131 668 4140 The Lyell Centre, Research Avenue South Edinburgh EH14 4AP UK enquiries@bgs.ac.uk custodian Natural Environment Research Council offshoredata@bgs.ac.uk originator notPlanned NDGO0001 Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication soil and sediment crust SeaVoX Vertical Co-ordinate Coverages (L131) 2010-05-18 revision Lithology SeaDataNet Parameter Discovery Vocabulary (P021) 2011-07-27 revision otherRestrictions otherRestrictions 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. unrestricted use, copyright acknowledgement - Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains Natural Environment Research Council materials ©NERC [year]" grid 5 English geoscientificInformation The SeaVoX Salt and Fresh Water Body Gazetteer: Sub-Ocean Category 1954-01-01 creation NORTHEAST PACIFIC OCEAN (180W) -128.3578 -126.1858 12.9333 13.7519 2023-02-04 2023-03-26 British Geological Survey (BGS) +44 (0)131 667 1000 +44 (0)131 668 4140 The Lyell Centre, Research Avenue South Edinburgh EH14 4AP UK enquiries@bgs.ac.uk distributor http://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=JC241 WWW:LINK-1.0-http--link BGS Offshore Geoindex GeoIndex allows users to search for information about BGS data collections covering the UK and other areas world wide. Access is free, the interface is easy to use, and it has been developed to enable users to check coverage of different types of data and find out some background information about the data. More detailed information can be obtained by further enquiry through the website. search dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of unknown theme 2011 publication See the referenced specification false Sample equipment types used included: Corer: Box. National Oceanography Centre was contracted to undertake the survey on behalf of Natural Environment Research Council. Sediment samples were collected from megacores (max 60 cm), ROV pushcores (max 30 cm, with one XL pushcore of 60 cm) and 5 metre gravity core. The megacores and gravity cores were wireline deployed over the side of the James Cook. Extensive ROV video footage and imaging allowed groundtruthing and precise landing location cataloguing for many megacores and gravity cores. ROV push cores were taken by ROV pilots in locations specified by scientists onboard, also allowing for precise location information. Once retrieved on deck, gravity cores were sectioned into roughly one metre sections labelled from (surface) A, B, C, D, E (base). Cylindrical sediment samples were collected using cut off syringes and porewater extracted using rhizomes (and split into aliquots for different analyses). Megacores and pushcore sediment was sampled by extrusion and slicing at set intervals. Sampling was generally 1 cm slices in the top 10 cm and 2 cm thick slices below 10 cm. Porewater was extracted at similar intervals using rhizomes and split into aliquots for different analyses. During deployment of boxcores, nodules were collected. After these nodules had been checked for fauna/biota by the biologists, they were washed to reduce salt build up, set out to dry, photographed in trays and bagged up in bulk bags by station number. They were then sealed. Nodules were also measured in three dimensions and data recorded.