Reply to "Oxygen isotope heterogeneity of the mantle beneath the Canary Islands: a discussion of the paper of Gurenko et al."

Andrey Gurenko (1) , Ilya Bindeman (2) , Marc Chaussidon (1, 3)

1 CRPG - Centre de Recherches Pétrographiques et Géochimiques
2 University of Oregon [Eugene]
3 IPG Paris - Institut de Physique du Globe de Paris

The comment by Day et al. (Contrib Mineral Petrol, 2012) (1) discusses the validity of the previously obtained oxygen isotope data for El Hierro and La Palma (Canary Island) olivines, (2) questions the approach by Gurenko et al. (Contrib Mineral Petrol 162:349-363, 2011) of using weakly correlated variations of δ¹⁸O_olivine values with X _px (proportion of pyroxenite-derived melt in the parental magma), and (3) provides reasons why oxygen isotope data by secondary ion mass spectrometry (SIMS) "offer sensitive means for detecting melt-crust interactions." We respond these comments and report a new set of oxygen isotope measurements performed by SIMS and single-grain laser fluorination methods. These measurements confirm our previous data and conclusions and demonstrate the ability of the SIMS technique to analyze O isotopes in terrestrial samples with 2-sigma uncertainty better than ±0.25 ‰.

Mots clés: Canary Islands; Oxygen isotopes; Olivine; Ion microprobe; Laser fluorination; Mantle heterogeneity

Domaines: Planète et Univers [physics]

Andrey Gurenko, Ilya Bindeman, Marc Chaussidon. Reply to "Oxygen isotope heterogeneity of the mantle beneath the Canary Islands: a discussion of the paper of Gurenko et al.". Contributions to Mineralogy and Petrology, 2012, 164 (1), pp.185-189. ⟨10.1007/s00410-012-0756-2⟩. ⟨insu-03619309⟩