Noble gas magmatic signature of the Andean Northern Volcanic Zone from fluid inclusions in minerals
Résumé
Trace volatile elements like He are key for understanding the mantle source signature of magmas and to better constrain the relative roles of subduction and crustal processes to the variability of along-arc chemical and isotopic signatures of magmatic fluids. Here we report on noble gas abundances and isotopic data of Fluid Inclusions (FIs) in eruptive products and/or fumarolic gases from the Colombia-Ecuador segment of Andean Northern Volcanic Zone (NVZ). FIs in olivine phenocrysts from Ecuador (El Reventador, Cotopaxi and Tungurahua) yield air-normalized corrected 3He/4He ratios of 7.0–7.4 RA, within the MORB range (8 ± 1 RA). With exception of the Cotopaxi lavas (opx <
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https://hal.science/hal-03881757
Soumis le : vendredi 2 décembre 2022-07:55:13
Dernière modification le : mardi 3 décembre 2024-10:30:02
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Identifiants
- HAL Id : hal-03881757 , version 1
- DOI : 10.1016/j.chemgeo.2020.119966
- IRD : fdi:010080531
Citer
J. Lages, A.L. Rizzo, A. Aiuppa, Pablo Samaniego, J.L. Le Pennec, et al.. Noble gas magmatic signature of the Andean Northern Volcanic Zone from fluid inclusions in minerals. Chemical Geology, 2021, 559, pp.119966. ⟨10.1016/j.chemgeo.2020.119966⟩. ⟨hal-03881757⟩
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