Constraints on flux rates and mantle dynamics beneath island arcs from Tonga-Kermadec lava geochemistry

Simon Turner*, Chris Hawkesworth

*Corresponding author for this work

Research output: Contribution to journalArticle

158 Citations (Scopus)

Abstract

Subduction processes are central to plate tectonics and to crust-mantle recycling and differentiation. Here we present a study of lavas from the Tonga-Kermadec Island arc which places important constraints on the processes and rates involved. The mantle wedge overlying the subducting oceanic plate is dynamically coupled to the descending plate, but may convect more slowly than expected. Fluid and sediment fluxes from the ocean plate enrich the wedge but differ in their location, mechanisms and rates. After partial melting, magma extraction occurs rapidly via channelled flow through the wedge.

Original languageEnglish
Pages (from-to)568-573
Number of pages6
JournalNature
Volume389
Issue number6651
DOIs
Publication statusPublished - 1997
Externally publishedYes

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