Rb/Cs fractionation: A link between granulite metamorphism and the S-process

S. R. Hart, M. R. Reid

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

High-grade metamorphism of pelitic sediments produces large Cs losses with little K and Rb depletion. Island-arc volcanics contain an enhanced Cs component, relative to K and Rb. We suggest a connection between these two processes whereby fluids or melts removed from feldspar-bearing subduction assemblages under high-grade metamorphic conditions are enriched in Cs relative to K and Rb; these Cs-enriched components infiltrate subarc mantle and lead to ubiquitous Cs enrichment in arc volcanics. Normal oceanic magmatism is not effective in fractionating Rb/Cs, therefore the canonical oceanic basalt value of 85 for Rb/Cs is distinctive relative to processes involving sediments, recycling, fluid/melt metamorphism, and arc volcanism.

Original languageEnglish (US)
Pages (from-to)2379-2383
Number of pages5
JournalGeochimica et Cosmochimica Acta
Volume55
Issue number8
DOIs
StatePublished - Aug 1991
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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