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Fe-rich ferropericlase and magnesiowüstite inclusions reflecting diamond formation rather than ambient mantle

2018; Geological Society of America; Volume: 47; Issue: 1 Linguagem: Inglês

10.1130/g45235.1

1943-2682

Paolo Nimis, Fabrizio Nestola, Mariangela Schiazza, Riccardo Reali, Giovanna Agrosì, Daniela Mele, Gioacchino Tempesta, Daniel Howell, Mark T. Hutchison, Richard Spiess,

earthquake and tectonic studies

Research Article| November 30, 2018 Fe-rich ferropericlase and magnesiowüstite inclusions reflecting diamond formation rather than ambient mantle Paolo Nimis; Paolo Nimis 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Search for other works by this author on: GSW Google Scholar Fabrizio Nestola; Fabrizio Nestola 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Search for other works by this author on: GSW Google Scholar Mariangela Schiazza; Mariangela Schiazza 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Search for other works by this author on: GSW Google Scholar Riccardo Reali; Riccardo Reali 2Unité Matériaux et Transformations, Université de Lille, 59655 Villeneuve d'Ascq, France Search for other works by this author on: GSW Google Scholar Giovanna Agrosì; Giovanna Agrosì 3Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy Search for other works by this author on: GSW Google Scholar Daniela Mele; Daniela Mele 3Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy Search for other works by this author on: GSW Google Scholar Gioacchino Tempesta; Gioacchino Tempesta 3Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy Search for other works by this author on: GSW Google Scholar Daniel Howell; Daniel Howell 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy4Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK Search for other works by this author on: GSW Google Scholar Mark T. Hutchison; Mark T. Hutchison 5Trigon GeoServices Ltd., Las Vegas, Nevada 89146, USA Search for other works by this author on: GSW Google Scholar Richard Spiess Richard Spiess 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Paolo Nimis 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Fabrizio Nestola 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Mariangela Schiazza 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Riccardo Reali 2Unité Matériaux et Transformations, Université de Lille, 59655 Villeneuve d'Ascq, France Giovanna Agrosì 3Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy Daniela Mele 3Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy Gioacchino Tempesta 3Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy Daniel Howell 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy4Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK Mark T. Hutchison 5Trigon GeoServices Ltd., Las Vegas, Nevada 89146, USA Richard Spiess 1Dipartimento di Geoscienze, Università di Padova, via G. Gradenigo 6, 35131 Padua, Italy Publisher: Geological Society of America Received: 05 Jun 2018 Revision Received: 11 Oct 2018 Accepted: 06 Nov 2018 First Online: 30 Nov 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2019) 47 (1): 27–30. https://doi.org/10.1130/G45235.1 Article history Received: 05 Jun 2018 Revision Received: 11 Oct 2018 Accepted: 06 Nov 2018 First Online: 30 Nov 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Paolo Nimis, Fabrizio Nestola, Mariangela Schiazza, Riccardo Reali, Giovanna Agrosì, Daniela Mele, Gioacchino Tempesta, Daniel Howell, Mark T. Hutchison, Richard Spiess; Fe-rich ferropericlase and magnesiowüstite inclusions reflecting diamond formation rather than ambient mantle. Geology 2018;; 47 (1): 27–30. doi: https://doi.org/10.1130/G45235.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract At the core of many Earth-scale processes is the question of what the deep mantle is made of. The only direct samples from such extreme depths are diamonds and their inclusions. It is commonly assumed that these inclusions reflect ambient mantle or are syngenetic with diamond, but these assumptions are rarely tested. We have studied inclusion–host growth relationships in two potentially superdeep diamonds from Juina (Brazil) containing nine inclusions of Fe-rich (XFe ≈0.33 to ≥0.64) ferropericlase-magnesiowüstite (FM) by X-ray diffractometry, X-ray tomography, cathodoluminescence, electron backscatter diffraction, and electron microprobe analysis. The inclusions share a common [112] zone axis with their diamonds and have their major crystallographic axes within 3°–8° of those of their hosts. This suggests a specific crystallographic orientation relationship (COR) resulting from interfacial energy minimization, disturbed by minor post-entrapment rotation around [112] due to plastic deformation. The observed COR and the relationships between inclusions and diamond growth zones imply that FM nucleated during the growth history of the diamond. Therefore, these inclusions may not provide direct information on the ambient mantle prior to diamond formation. Consequently, a "non-pyrolitic" composition of the lower mantle is not required to explain the occurrence of Fe-rich FM inclusions in diamonds. By identifying examples of mineral inclusions that reflect the local environment of diamond formation and not ambient mantle, we provide both a cautionary tale and a means to test diamond-inclusion time relationships for proper application of inclusion studies to whole-mantle questions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.