Solidus of alkaline carbonatite in the deep mantle

Konstantin D. Litasov, Anton Shatskiy, Eiji Ohtani, Gregory M. Yaxley

Research output: Contribution to journalArticlepeer-review

114 Citations (Scopus)

Abstract

Minor amounts of alkalies (Na and K) can reduce drastically the solidus temperatures of carbonated silicate mantle, by as much as 400-500 °C. Low-degree melting of carbonated peridotite and eclogite at pressures of 3-10 GPa produces Na- and K-bearing carbonatite melt. Mass-balance calculations of samples obtained below apparent solidi show clear defi cits of alkalies, suggesting the presence of minor alkali-rich liquid or solid carbonate phases. Here we determine the true solidi in Na- and K-bearing carbonate systems and report the stability of alkaline carbonate phases. Melting of subducting alkaline carbonates would likely occur at transition zone depths to produce mobile carbonatite melt diapirs that migrate upward, modifying and oxidizing the upper mantle and initiating volcanism at the surface.

Original languageEnglish
Pages (from-to)79-82
Number of pages4
JournalGeology
Volume41
Issue number1
DOIs
Publication statusPublished - 2013 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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