Strontium and Neodymium Isotopic Signatures in Basalt Glasses of the Mid-Atlantic Ridge, 12°–31° N

A. R. Tskhovrebova; Цховребова А. Р.; V. V. Shabykova; Шабыкова В. В.; S. A. Silantyev; Силантьев С. А.; A. I. Buikin; Буйкин А. И.

doi:10.31857/S0016752523120051

Strontium and Neodymium Isotopic Signatures in Basalt Glasses of the Mid-Atlantic Ridge, 12°–31° N

Authors: Tskhovrebova A.R.¹, Shabykova V.V.¹, Silantyev S.A.¹, Buikin A.I.¹
Affiliations:
1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia
Issue: Vol 68, No 12 (2023)
Pages: 1241-1252
Section: Articles
URL: https://journals.rcsi.science/0016-7525/article/view/233637
DOI: https://doi.org/10.31857/S0016752523120051
EDN: https://elibrary.ru/LRTFOA
ID: 233637

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Abstract

This paper presents the new geochemical isotope (Sr–Nd system, H2O, Cl) data obtained for basalt glasses of the Mid-Atlantic Ridge (MAR) sampled from six areas of the MAR axial zone between 31° and 12° N. The data are consistent with the existing ideas about large-scale geochemical segmentation of the MAR. It is shown that samples from predominantly serpentinite segments have a narrower range of variations of strontium isotopic composition (87Sr/86Sr = 0.7027–0.7032) in comparison with samples collected from the areas where the crustal section is dominated by basalts (87Sr/86Sr = 0.7024–0.7041). The variation ranges of the neodymium isotopic composition in these two groups of samples are almost identical (εNd = +4.9 to +10.9 and +5.9 to +11.6 in serpentinite and basalt segments, respectively), although, in general, serpentinite segments have a slightly more enriched composition. The wide variations of the neodymium isotopic composition and increased contents of Cl, H2O, and U, as well as increased K2O/TiO2 and La/Sm ratios, in samples from serpentinites can most probably be related to the participation of different geochemically heterogeneous sources in the magmatism of the MAR axial zone. The influence of enriched plume-type matter cannot be excluded in some segments. The isotopic composition of noble gases may shed light on the subject.

Keywords

Mid-Atlantic Ridge, basalt glasses, Rb–Sr, Sm–Nd, H2O, Cl

References

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