Article Dans Une Revue Geochemical Perspectives Letters Année : 2025

Halogens in proto-Iceland plume basalts

Résumé

Melt inclusions in olivine phenocrysts from high 3He/4He proto-Iceland plume (PIP) basalts from Baffin Island and West Greenland have elevated Br/Cl ratios, extending to values significantly above those found in mid-ocean ridge basalt (MORB) and ocean island basalt (OIB). Chlorine isotope compositions are indistinguishable from MORB-source mantle and high Br/Cl occurs in the absence of geochemical indicators for serpentinite, altered oceanic crust or sediment. The highest Br/Cl occurs in melt inclusions from basalts with the highest 3He/4He. The high Br/Cl ratios are at the high end of the range of putative Earth-source meteorites (CI- and CM-type carbonaceous chondrites). The PIP melt inclusion compositions are consistent with the addition of a small volume of halogen-rich, high Br/Cl chondritic material to halogen-depleted, low Br/Cl mantle.

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Dates et versions

hal-05308729 , version 1 (10-10-2025)
hal-05308729 , version 2 (14-10-2025)

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E.L. Tomlinson, Estelle F. Rose-Koga, A.-S. Bouvier, D. O’farrell, J.T. Caulfield, et al.. Halogens in proto-Iceland plume basalts. Geochemical Perspectives Letters, 2025, 37, pp.12-17. ⟨10.7185/geochemlet.2539⟩. ⟨hal-05308729v1⟩
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