Ultrafast source-to-surface movement of melt at island arcs from 226Ra-230Th systematics

Simon Turner*, Peter Evans, Chris Hawkesworth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

156 Citations (Scopus)


Island arc lavas have radium-226 excesses that extend to higher values than those observed in mid-ocean ridge or ocean island basalts. The initial ratio of radium-226 to thorium-230 is largest in the most primitive lavas, which also have the highest barium/thorium ratios, and decreases with increasing magmatic differentiation, Therefore, the radium-226 excesses appear to have been introduced into the base of the mantle melting column by fluids released from the subducting plate, Preservation of this signal requires transport to the surface arguably in only a few hundreds of years and directly constrains the average melt velocity to the order of 1000 meters per year. Thus, melt segregation and channel formation can occur rapidly in the mantle.

Original languageEnglish
Pages (from-to)1363-1366
Number of pages4
Issue number5520
Publication statusPublished - 18 May 2001
Externally publishedYes


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