Deep mantle cycling of oceanic crust

evidence from diamonds and their mineral inclusions

M. J. Walter*, S. C. Kohn, D. Araujo, G. P. Bulanova, C. B. Smith, E. Gaillou, J. Wang, A. Steele, S. B. Shirey

*Corresponding author for this work

Research output: Contribution to journalArticle

219 Citations (Scopus)

Abstract

A primary consequence of plate tectonics is that basaltic oceanic crust subducts with lithospheric slabs into the mantle. Seismological studies extend this process to the lower mantle, and geochemical observations indicate return of oceanic crust to the upper mantle in plumes. There has been no direct petrologic evidence, however, of the return of subducted oceanic crustal components from the lower mantle. We analyzed superdeep diamonds from Juina-5 kimberlite, Brazil, which host inclusions with compositions comprising the entire phase assemblage expected to crystallize from basalt under lower-mantle conditions. The inclusion mineralogies require exhumation from the lower to upper mantle. Because the diamond hosts have carbon isotope signatures consistent with surface-derived carbon, we conclude that the deep carbon cycle extends into the lower mantle.

Original languageEnglish
Pages (from-to)54-57
Number of pages4
JournalScience
Volume334
Issue number6052
DOIs
Publication statusPublished - 7 Oct 2011
Externally publishedYes

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    Walter, M. J., Kohn, S. C., Araujo, D., Bulanova, G. P., Smith, C. B., Gaillou, E., ... Shirey, S. B. (2011). Deep mantle cycling of oceanic crust: evidence from diamonds and their mineral inclusions. Science, 334(6052), 54-57. https://doi.org/10.1126/science.1209300