Chen, S. and Hin, R.C. and John, T. and Brooker, R. and Bryan, B. and Niu, Y.L and Elliott, T. (2019) 'Molybdenum systematics of subducted crust record extensive, reactive flow from underlying slab-serpentine dehydration.', Nature communications., 10 . p. 4773.
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.
|Full text:||Publisher-imposed embargo |
(AM) Accepted Manuscript
File format - PDF (1082Kb)
|Full text:||(VoR) Version of Record|
Available under License - Creative Commons Attribution.
Download PDF (1014Kb)
|Publisher Web site:||https://doi.org/10.1038/s41467-019-12696-3|
|Publisher statement:||© The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/.|
|Date accepted:||19 September 2019|
|Date deposited:||17 October 2019|
|Date of first online publication:||21 October 2019|
|Date first made open access:||22 October 2019|
Save or Share this output
|Look up in GoogleScholar|