eprintid: 1473736 rev_number: 23 eprint_status: archive userid: 608 dir: disk0/01/47/37/36 datestamp: 2016-02-02 17:41:06 lastmod: 2021-11-08 00:08:22 status_changed: 2016-02-02 17:41:06 type: article metadata_visibility: show creators_name: Burnham, AD creators_name: Thomson, AR creators_name: Bulanova, GP creators_name: Kohn, SC creators_name: Smith, CB creators_name: Walter, MJ title: Stable isotope evidence for crustal recycling as recorded by superdeep diamonds ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F57 keywords: diamonds; stable isotopes; subduction; majorite; stishovite note: (C) 2015 Elsevier B.V. This manuscript is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0. Access may be initially restricted by the publisher. abstract: © 2015 Elsevier B.V. Sub-lithospheric diamonds from the Juina-5 and Collier-4 kimberlites and the Machado River alluvial deposit in Brazil have carbon isotopic compositions that co-vary with the oxygen isotopic compositions of their inclusions, which implies that they formed by a mixing process. The proposed model for this mixing process, based on interaction of slab-derived carbonate melt with reduced (carbide- or metal-bearing) ambient mantle, explains these isotopic observations. It is also consistent with the observed trace element chemistries of diamond inclusions from these localities and with the experimental phase relations of carbonated subducted crust. The 18O-enriched nature of the inclusions demonstrates that they incorporate material from crustal protoliths that previously interacted with seawater, thus confirming the subduction-related origin of superdeep diamonds. These samples also provide direct evidence of an isotopically anomalous reservoir in the deep (≥350 km) mantle. date: 2015-12-15 date_type: published official_url: http://dx.doi.org/10.1016/j.epsl.2015.10.023 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green article_type_text: Journal Article verified: verified_manual elements_id: 1086304 doi: 10.1016/j.epsl.2015.10.023 lyricists_name: Thomson, Andrew lyricists_id: ATHOA85 actors_name: Thomson, Andrew actors_id: ATHOA85 actors_role: owner full_text_status: public publication: Earth and Planetary Science Letters volume: 432 pagerange: 374-380 issn: 0012-821X citation: Burnham, AD; Thomson, AR; Bulanova, GP; Kohn, SC; Smith, CB; Walter, MJ; (2015) Stable isotope evidence for crustal recycling as recorded by superdeep diamonds. Earth and Planetary Science Letters , 432 pp. 374-380. 10.1016/j.epsl.2015.10.023 <https://doi.org/10.1016/j.epsl.2015.10.023>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1473736/1/O%20isotopes%20open%20access.pdf