42624068-e38a-5294-e063-3050940ac0d8 English nonGeographicDataset non geographic dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-05-24 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608571 Mid-Ocean Ridge Basalt (MORB) Hafnium isotope data and eclogite trace element maps 2025-10-15 creation http://data.bgs.ac.uk/id/dataHolding/13608571 Whole rock Hafnium (Hf) isotope data for mid-oceanic ridge basalt (MORB) samples from the Reykjanes ridge, Arctic Ocean, Equatorial MAR, South MAR, SEIR. The Hf isotope results are not yet published but will contribute to the mantle characterisation efforts detailed in Béguelin et al. (2025) (https://doi.org/10.1029/2025GC012357). Mid-Ocean Ridge Basalt (MORB) glasses were crushed and sieved to ~600 µm. Chips were then hand-piked under a binocular microscope to remove alteration (only optically clear chips selected). Hf fractions were purified using the column chemistry protocol of Béguelin et al. (2017) and references therein (https://doi.org/10.1016/j.gca.2017.09.015). Hf isotope ratios were measured on a Nu Instruments Plasma II mass spectrometer equipped with an Aridus desolvating nebuliser, on 50 ppb solutions. Accuracy and precision were monitored with repeated measurements of the JMC-475 standard (reported in dataset). Scanning Electron Microscopy-Energy Dispersive Spectrometry (SEM EDS) and Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) major and trace elements maps of eclogites from the Raspas complex (Ecuador). Samples were prepared as 1-inch epoxy mounts. Samples are described in John et al. (2010) (https://doi.org/10.1007/s00410-009-0427-0). The objective of this (present) work is to trace U, Pb and Th fluxes during subduction, as documented by obducted eclogites. Dataset includes SEM mapping of major elements with a Zeiss Sigma HD Field Emission Gun Analytical Scanning Electron Microscope (SEM) using energy dispersive X-ray spectroscopy (EDS). Elements measured are Fe, Ca, Cu, Ni, Mn, K, Na, Al, Mg, Ti, O, Cr, S, Si, P, Zr. Resolution is 25µm. Dataset also includes LA-ICP-MS mapping of trace elements using an Elemental Scientific ESL213 laser coupled to a Thermo Scientific iCap Q mass spectrometer. Elements measured are Rb, Sr, Mo, Cs, La, Yb, Pb, Th, U. Parameters: Raster spacing (resolution): 40µm, scan speed: 80 µm/s, rep rate: 20 Hz, fluence: 4.5 J/cm2, dwell time per element: 50 ms, injector: ESI dual concentric injector (DCI). SEM data are in weight %, LA-ICP-MS data are in µg/g (ppm). Data are unpublished, but further details can be found in the poster included with the dataset. Dataset was produced at the School of Earth and Environmental Sciences, Cardiff University, in the context of NERC grant NE/T012633/1 Mantle Circulation Constrained (MC2): A multidisciplinary 4D Earth framework for understanding mantle upwellings. Professor Tim Elliott University of Bristol School of Earth Sciences Wills Memorial Building Bristol BS8 1RJ not available originator Morten Andersen University of Cardiff not available originator Paul Beguelin University of Cardiff School of Earth and Environmental Sciences Cardiff CF10 3AT not available originator Joey Rodney University of Bristol not available originator 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/42624068-e38a-5294-e063-3050940ac0d8.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Eclogite MORB Hafnium isotopes Major element analysis Trace analysis Isotopes BGS Thesaurus of Geosciences 2022 revision Citable Data NGDC Deposited Data dataCentre NERC_DDC otherRestrictions licenceOGL Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" 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. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" English geoscientificInformation 2025-01-30 2025-04-04 Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item190425 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/a9cbce58-d20b-4881-a6bf-14ef7e777bcc WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Béguelin, P., Andersen, M., Elliott, T., Rodney, J. (2025). Mid-Ocean Ridge Basalt (MORB) Hafnium isotope data and eclogite trace element maps. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/a9cbce58-d20b-4881-a6bf-14ef7e777bcc information nonGeographicDataset non geographic 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 Hf isotopes: MORB glasses were crushed, sieved and picked (~100 µm fragments) to avoid surface alteration. Samples were digested in HF and wash out of Mo chemistry were collected (Mo chemistry and subsequent work handled by Bristol collaborators). Hf was purified from resulting aliquots following the method of Béguelin et al. (2017, GCA 218). Hf isotopes were measured on a Nu plasma 2 mass spectrometer. Accuracy and precision were monitored by measurements of the JMC Hf standard and of the BHVO-2 and BIR-2 (values included in the dataset). SEC_SEM and SEC_laser files: SEM EDS and LA-ICP-MS major and trace elements maps of polished samples. SEM: 1 pixel = 25 µm. LA-ICP-MS: 1 pixel = 40 µm. Laser parameters: scan speed: 80 µm/s, rep rate: 20 Hz, fluence: 4.5 J/cm2, MS: Thermo iCap Q, dwell time per element: 50 ms, injector: ESI dual concentric injector (DCI).