Boron isotopes as a tracer of subduction zone processes

Cees-Jan De Hoog, Ivan Savov

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review

Abstract

This chapter reviews recycling of boron (B) and its isotopes in subduction zones. It discuss-es the profound changes in B concentrations and B isotope ratios of various materials in-volved in convergent margin evolution, in particular highlighting the fate and evolution of progressively dehydrating subducting slabs and the behavior of B during burial and subse-quent metamorphism. We review various models used to parametrize these complex and often poorly understood processes and critically evaluate the available data from the literature. We proceed by reviewing B isotope data from mafic arc volcanic rocks and explore systematic variations with subduction zone geometry as well as familiar geochemical tracers of subduc-tion processes. Finally, the role of serpentinisation in the mantle wedge is discussed in the light of new geochemical and petrological insights on the importance of serpentinites and subduction erosion. We provide recommendations for further research on B isotopes in sub-duction zones and directions where we think this exciting stable isotope tracer may make the biggest impact.
Original languageEnglish
Title of host publicationAdvances in Isotope Geochemistry
Subtitle of host publicationBoron Isotopes - the Fifth Element
EditorsHorst Marschall, Gavin Foster
PublisherSpringer
Pages217-247
Volume6
Edition1
ISBN (Electronic)978-3-319-64666-4
ISBN (Print)978-3-319-64664-0
Publication statusPublished - 18 Nov 2018

Publication series

NameAdvances in Isotope Geochemistry
PublisherSpringer
ISSN (Print)2364-5105

Keywords

  • Boron
  • B isotopes
  • subduction recycling
  • metamorphism
  • arc volcanism
  • volatiles
  • fluids

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