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- W2008292218 abstract "Research Article| August 01, 2013 Metapyroxenite in the mantle transition zone revealed from majorite inclusions in diamonds Ekaterina S. Kiseeva; Ekaterina S. Kiseeva 1Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia *Current address: Department of Earth Sciences, University of Oxford, OX1 3AN Oxford, UK. Search for other works by this author on: GSW Google Scholar Gregory M. Yaxley; Gregory M. Yaxley 1Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Aleksandr S. Stepanov; Aleksandr S. Stepanov 1Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia2ARC Centre of Excellence in Ore Deposits and School of Earth Sciences, University of Tasmania, Hobart, TAS 7001, Australia Search for other works by this author on: GSW Google Scholar Hrvoje Tkalčić; Hrvoje Tkalčić 1Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Konstantin D. Litasov; Konstantin D. Litasov 3V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Science, Novosibirsk 630090, Russia Search for other works by this author on: GSW Google Scholar Vadim S. Kamenetsky Vadim S. Kamenetsky 2ARC Centre of Excellence in Ore Deposits and School of Earth Sciences, University of Tasmania, Hobart, TAS 7001, Australia Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (8): 883–886. https://doi.org/10.1130/G34311.1 Article history received: 12 Dec 2012 rev-recd: 20 Mar 2013 accepted: 01 Apr 2013 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Ekaterina S. Kiseeva, Gregory M. Yaxley, Aleksandr S. Stepanov, Hrvoje Tkalčić, Konstantin D. Litasov, Vadim S. Kamenetsky; Metapyroxenite in the mantle transition zone revealed from majorite inclusions in diamonds. Geology 2013;; 41 (8): 883–886. doi: https://doi.org/10.1130/G34311.1 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 The transition zone of the Earth’s mantle (the depth interval between two major seismic discontinuities at 410 km and 660 km) is critical to understanding our planet’s evolution. Some diamonds are thought to have originated in the transition zone and the inclusions found in them are the only samples of material directly extracted from this depth range. By comparing natural majorite garnet inclusions in diamonds with the compositions of experimentally crystallized majorite garnets, we determine two major compositional trends, the pure metabasitic (or eclogitic) trend and the combined metaperidotitic and metapyroxenitic trend, that are strongly correlated with their preferred substitution mechanisms during majorite formation. Based on these trends, we demonstrate that the majority of the reported majorite inclusions in natural diamonds formed neither in a pure metabasite nor in a metaperidotite lithology, but in fact crystallized from a wide range of compositions intermediate between conventional basaltic and peridotitic, referred to here as metapyroxenitic. Given the dominance of metapyroxenite-type majorite diamond inclusions and their inferred syngenetic origin, we argue that a significant fraction of metapyroxenite rock is present within Earth’s transition zone and is important in the diamond-forming process. This is in agreement with recent self-consistent seismological and/or mineral physics studies that support models of a lithologically heterogeneous transition zone. From trace element and carbon isotope features, we infer a crustal origin for these rocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2008292218 title "Metapyroxenite in the mantle transition zone revealed from majorite inclusions in diamonds" @default.
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