568f784c-1758-e7a0-e063-3050940af7ef 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 2026-08-25 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608745 Paleomagnetic, rock-magnetic and paleointensity data from three early Paleozoic geological units: plutons of the Araçuaí orogen, Brazil; Gabbros of Aberdeenshire, Scotland; and a Silurian volcanic succession of the southern Britain 2026-07-10 creation http://data.bgs.ac.uk/id/dataHolding/13608745 The dataset contains results from three early Paleozoic geological units: the approximately 500 Ma Santa Angélica and Venda Nova plutons of the Araçuaí orogen, Brazil; the approximately 470 Ma Younger Gabbros of Aberdeenshire, Scotland; and the approximately 430 Ma Silurian volcanic succession of the East Mendips Inlier, southern Britain. The deposited files include specimen- and site-level paleointensity results, paleomagnetic directional data, rock-magnetic measurements, methodological and selection-criteria information, and the processed data used to construct the long-term virtual dipole moment and geomagnetic polarity-reversal-frequency synthesis. Upload-ready files for analysis using Paleomagnetism.org and Paleointensity.org are also included, together with file-level metadata. These data provide new estimates of geomagnetic field strength from approximately 500-430 Ma and help fill a major gap in the Phanerozoic paleointensity record. They were used to investigate the relationship between long-term geomagnetic dipole moment and polarity reversal frequency. The data relate to three study areas: the Santa Araçuaí and Venda Nova plutons in the Araçuaí­ orogen, Espírito Santo, southeastern Brazil; the Younger Gabbros of Aberdeenshire, northeast Scotland; and the Early Wenlock volcanic succession of the East Mendips Inlier at Stokes Quarry, Somerset, southern Britain. Data support the paper "Geomagnetic dipole moment and polarity reversal frequency covary on a ~200-million-year timescale". The paper identifies the three datasets and their respective ages and locations, and states that the deposit contains upload-ready analytical files, metadata and the data used to construct the long-term synthesis." Dr Simon Lloyd University of Liverpool not available originator Dr Rebecca Hopkins University of Liverpool not available originator Joseph Brabin University of Liverpool 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/568f784c-1758-e7a0-e063-3050940af7ef.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Cambrian Geomagnetic reversals Ordovician Palaeozoic Earth core Magnetism Palaeomagnetism Phanerozoic Earth mantle Silurian Geomagnetism 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 2024-02-01 2026-07-01 Comma-Separated Values (CSV) file (.csv) Text file (TXT) Microsoft Excel spreadsheet (.xlsx) Enquiries British Geological Survey United Kingdom not available distributor https://doi.org/10.5285/25ec9da7-0da9-4e4c-8aab-f8c4646936e4 WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Lloyd, S., Hopkins, R., Brabin, J. (2026). Paleomagnetic, rock-magnetic and paleointensity data from three early Palaeozoic geological units: plutons of the Araçuaí orogen, Brazil; Gabbros of Aberdeenshire, Scotland; and a Silurian volcanic succession of the southern Britain. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/25ec9da7-0da9-4e4c-8aab-f8c4646936e4 information https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item192730 WWW:DOWNLOAD-1.0-http--download Data download 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 Oriented drill cores and hand samples were analysed using rock-magnetic, microscopy and paleointensity methods. Magnetic mineralogy was characterised using hysteresis, thermomagnetic measurements, scanning electron microscopy and EDX. Absolute paleointensity estimates were obtained using thermal Thellier, microwave, Shaw, pseudo-Thellier, Triaxe and Wilson methods, as appropriate. Results were screened using directional and method-specific reliability criteria, and site means were calculated from accepted specimen-level results. Cooling-rate experiments were also undertaken for the intrusive rocks.