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dc.contributor.authorTomlinson, Emma
dc.date.accessioned2023-09-15T08:56:18Z
dc.date.available2023-09-15T08:56:18Z
dc.date.issued2023
dc.date.submitted2023en
dc.identifier.citationCarl Walsh, Balz Kamber, Emma L. Tomlinson, Deep, ultra-hot-melting residues as cradles of mantle diamond, Nature, 615, 7952, 2023, 450--454en
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/103862
dc.descriptionPUBLISHEDen
dc.description.abstractThe ancient stable continents are up to 250 km deep, with roots extending into the diamond stability field. These cratons owe their mechanical strength to being cool and rigid, features inherited from extensive melt extraction. The most prominent model for craton formation anticipates dominant melting at relatively shallow depth (50-100 km) above diamond stability, followed by later imbrication to form the deeper roots. Here we present results from thermodynamic and geochemical modelling of melting at sufficiently high temperatures to produce the very magnesian olivine of cratonic roots10. The new closed-system and open-system modelling reproduces the observed cratonic mantle mineral compositions by deep (about 200 km) and very hot melting (≥1,800 °C), obviating the need for shallow melting and stacking. The modelled highly magnesian liquids (komatiites) evolve to Al-enriched and Ti-depleted forms, as observed in the greenstone belts at the fossil surface of cratons. The paucity of Ti-depleted komatiite implies that advanced closed-system isochemical melting (>1,825 °C) was much less common than open-system interaction between deeper liquids and melting of existing refractory mantle. The highly refractory compositions of diamond inclusion minerals could imply preferential diamond growth in the more reducing parts of the cratonic root, depleted by ultra-hot melting in response to heat plumes from a deeper former boundary layer that vanished at the end of the Archaean.en
dc.format.extent450--454en
dc.language.isoenen
dc.relation.ispartofseriesNature;
dc.relation.ispartofseries615;
dc.relation.ispartofseries7952;
dc.rightsYen
dc.titleDeep, ultra-hot-melting residues as cradles of mantle diamonden
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/tomlinse
dc.identifier.rssinternalid252701
dc.identifier.doihttp://dx.doi.org/10.1038/s41586-022-05665-2
dc.rights.ecaccessrightsopenAccess
dc.identifier.orcid_id0000-0002-0646-6640


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