26547278-cfd8-1491-e063-0937940a3eb3 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 2026-04-16 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608306 Experimental logs and analysis of olivine polymorphs and MORB (Mid-Ocean Ridge Basalt) composition garnetite samples recovered from high-pressure faulting experiments 2024-09-26 creation http://data.bgs.ac.uk/id/dataHolding/13608306 Multi-anvil experiments were performed both in static and deformation geometries on olivine polymorphs and MORB (Mid-Ocean Ridge Basalt) -composition garnetite. Faults were induced by uniaxial compression in both garnetite and wadsleyite but only the garnetite showed evidence of thermal run away to melting. These results suggest that strain localisation by thermal feedback might be an important mechanism for triggering deep earthquakes in the crustal portion of subducted slabs in the deeper transition zone (~500-660 km depth). Prof David Dobson University College London Professor of Earth Materials Kathleen Lonsdale Building, Gower Street London WC1E 6BT not available originator Longian Xie University College London not available originator Fang Xu University College London not available originator Katharina Marquardt University of Oxford 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/26547278-cfd8-1491-e063-0937940a3eb3.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Deep seismic surveys Basalt MORB Garnetite BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data Citable 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]. 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Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" English geoscientificInformation 2022-11-01 2024-10-12 Microsoft PowerPoint (PPTX) witheld Microsoft Word (DOCX) witheld Microsoft Excel (XLSX) witheld Image (TIFF) Image (JPEG) Text file (TXT) witheld Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186488 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/7b24d391-ce38-42e2-a9d7-f2704d4ccf1f WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Dobson, D., Xie, L., Xu, F., Marquardt, K. (2024). Experimental logs and analysis of olivine polymorphs and MORB (Mid-Ocean Ridge Basalt) composition garnetite samples recovered from high-pressure faulting experiments. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/7b24d391-ce38-42e2-a9d7-f2704d4ccf1f 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 Samples were pre-synthesised at 15 GPa and 1473 K from synthetic glass of MORB composition, or from San-Carlos olivine, in platinum foil capsules. Recovered synthetic samples were prepared for deformation experiments using the deformation-T-cup press at UCL (see Hunt et al Rev. Sci. Instr. 85, 085103, 2014. doi: 10.1063/1.4891338). Ductile deformation was performed at 15 GPa and 1473 K in axial shortening mode. Further brittle faults were introduced into the sample during decompression. Recovered deformed sample was sectioned perpendicular to the faults and polished for SEM and chemical analyses at UCL. TEM foils were prepared and TEM analysis was performed at Imperial College.