Preprints
https://doi.org/10.5194/egusphere-2023-2933
https://doi.org/10.5194/egusphere-2023-2933
08 Jan 2024
 | 08 Jan 2024
Status: this preprint is open for discussion.

Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction

Sune G. Nielsen, Frieder Klein, Horst R. Marschall, Phillip A. E. Pogge von Strandmann, and Maureen Auro

Abstract. Studies of magnesium (Mg) isotope ratios in subduction zone lavas have revealed small, but significant offsets from the mantle value with enrichments in the heavy isotopes. However, the very high concentration of Mg in the mantle contrasts with much lower concentrations in the subducted igneous crust and oceanic sediments, making these subduction components unlikely vehicles of the Mg isotope anomalies in arc lavas. Only serpentinites, which in various proportions form part of oceanic plates, have high Mg contents comparable to fresh mantle rocks and have thus been considered a potential source of exotic Mg in the source of arc magmas.

In this study we analyzed serpentinite samples from different oceanic settings for their Mg isotopic compositions. The majority of samples are indistinguishable from the depleted mantle (δ26Mg = −0.24 ± 0.04 ‰) irrespective of their origin. Only a small number of seafloor-weathered serpentinites are slightly enriched in the heavy isotopes (up to δ26Mg = −0.14 ± 0.03 ‰), implying that bulk serpentinites are unlikely sources of isotopically anomalous Mg in subduction zones.

We also developed a partial-dissolution method in which 5 % acetic acid for 180 minutes was shown to fully dissolve the minerals brucite and iowaite while leaving the serpentine mineral chrysotile essentially undissolved.

Partial dissolution of 11 bulk serpentinite samples revealed a Mg isotopic composition of brucite (±iowaite) that is systematically ~0.25 ‰ heavier than that of coexisting serpentine. Thus, preferential breakdown of brucite and/or iowaite in a subducted slab prior to serpentine could preferentially release isotopically heavy Mg, which could subsequently be transported into the source region of arc magmas. Such a scenario would require brucite/iowaite breakdown to occur at pressures in excess of 3 GPa and produce fluids with very high concentrations of Mg that could be transported to arc magma source regions. Whether these conditions are met in nature has yet to be experimentally investigated.

Sune G. Nielsen, Frieder Klein, Horst R. Marschall, Phillip A. E. Pogge von Strandmann, and Maureen Auro

Status: open (until 11 Mar 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Sune G. Nielsen, Frieder Klein, Horst R. Marschall, Phillip A. E. Pogge von Strandmann, and Maureen Auro
Sune G. Nielsen, Frieder Klein, Horst R. Marschall, Phillip A. E. Pogge von Strandmann, and Maureen Auro

Viewed

Total article views: 133 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
90 38 5 133 20 3 2
  • HTML: 90
  • PDF: 38
  • XML: 5
  • Total: 133
  • Supplement: 20
  • BibTeX: 3
  • EndNote: 2
Views and downloads (calculated since 08 Jan 2024)
Cumulative views and downloads (calculated since 08 Jan 2024)

Viewed (geographical distribution)

Total article views: 136 (including HTML, PDF, and XML) Thereof 136 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 04 Mar 2024
Download
Short summary
Magnesium isotope ratios of arc lavas have been proposed as a proxy for serpentinite subduction, but uncertainties remain regarding their utility. Here we show that bulk serpentinite Mg isotope ratios are identical to the mantle, whereas the serpentinite mineral brucite is enriched in heavy Mg isotopes. Thus, Mg isotope ratios may only be used as serpentinite subduction proxies if brucite is preferentially mobilized from the slab at pressures and temperatures within the arc magma source region.