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Molybdenum systematics of subducted crust record extensive, reactive flow from underlying slab-serpentine dehydration

Chen, S.; Hin, R.C.; John, T.; Brooker, R.; Bryan, B.; Niu, Yaoling; Elliott, T.

Molybdenum systematics of subducted crust record extensive, reactive flow from underlying slab-serpentine dehydration Thumbnail


Authors

S. Chen

R.C. Hin

T. John

R. Brooker

B. Bryan

Yaoling Niu

T. Elliott



Abstract

Fluids liberated from subducting slabs are critical in global geochemical cycles. We investigate the behaviour of Mo during slab dehydration using two suites of exhumed fragments of subducted, oceanic lithosphere. Our samples display a positive correlation of δ98/95MoNIST 3134 with Mo/Ce, from compositions close to typical mantle (−0.2‰ and 0.03, respectively) to very low values of both δ98/95MoNIST 3134 (−1‰) and Mo/Ce (0.002). Together with new, experimental data, we show that molybdenum isotopic fractionation is driven by preference of heavier Mo isotopes for a fluid phase over rutile, the dominant mineral host of Mo in eclogites. Moreover, the strongly perturbed δ98/95MoNIST 3134 and Mo/Ce of our samples requires that they experienced a large flux of oxidised fluid. This is consistent with channelised, reactive fluid flow through the subducted crust, following dehydration of the underlying, serpentinised slab mantle. The high δ98/95MoNIST 3134 of some arc lavas is the complement to this process.

Citation

Chen, S., Hin, R., John, T., Brooker, R., Bryan, B., Niu, Y., & Elliott, T. (2019). Molybdenum systematics of subducted crust record extensive, reactive flow from underlying slab-serpentine dehydration. Nature Communications, 10, Article 4773. https://doi.org/10.1038/s41467-019-12696-3

Journal Article Type Article
Acceptance Date Sep 19, 2019
Online Publication Date Oct 21, 2019
Publication Date Oct 31, 2019
Deposit Date Oct 17, 2019
Publicly Available Date Oct 22, 2019
Journal Nature Communications
Publisher Nature Research
Peer Reviewed Peer Reviewed
Volume 10
Article Number 4773
DOI https://doi.org/10.1038/s41467-019-12696-3

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