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| Paquet, Marine; Hamelin, Cédric; Moreira, Manuel; Cannat, Mathilde. |
| The eastern Southwest Indian Ridge, between 61° and 67°E, has a very low melt supply and comprises several corridors of nearly amagmatic spreading that expose mantle-derived serpentinized peridotite. More volcanically active ridge portions separate these corridors. He, Ne, Pb, Nd, Hf and Sr isotopes were analyzed in basalt glasses dredged on two types of seafloor: volcanic and ultramafic. Basalts dredged in ultramafic seafloor on-axis tend to be slightly more depleted for heavy radiogenic isotopes and show slightly higher 3He/4He isotope ratios than basalts dredged in volcanic seafloor, with no systematic difference in neon isotope ratios. We propose that both types of basalts are derived from the same mantle source, but that the basalts dredged on... |
| Tipo: Text |
Palavras-chave: Mid-Ocean Ridge Basalts; Mantle heterogeneity; Noble gases; Isotope geochemistry; Melt/mantle interactions. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00633/74525/74360.jpg |
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