Abstract:
:Boron has become the principle proxy for the release of seawater-derived fluids into arc volcanics, linked to cross-arc variations in boron content and isotopic ratio. Because all ocean floor serpentinites so far analysed are strongly enriched in boron, it is generally assumed that if the uppermost slab mantle is hydrated, it will also be enriched in boron. Here we present the first measurements of boron and boron isotopes in fast-spread oceanic gabbros in the Pacific, showing strong take-up of seawater-derived boron during alteration. We show that in one-pass hydration of the upper mantle, as proposed for bend fault serpentinisation, boron will not reach the hydrated slab mantle. Only prolonged hydrothermal circulation, for example in a long-lived transform fault, can add significant boron to the slab mantle. We conclude that hydrated mantle in subducting slabs will only rarely contribute to boron enrichment in arc volcanics, or to deep mantle recycling.
journal_name
Nat Communjournal_title
Nature communicationsauthors
McCaig AM,Titarenko SS,Savov IP,Cliff RA,Banks D,Boyce A,Agostini Sdoi
10.1038/s41467-018-07064-6subject
Has Abstractpub_date
2018-11-02 00:00:00pages
4602issue
1issn
2041-1723pii
10.1038/s41467-018-07064-6journal_volume
9pub_type
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