Noble gas magmatic signature of the Andean Northern Volcanic Zone from fluid inclusions in minerals

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 a...

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Bibliographic Details
Published in:Chemical geology 2021-01, Vol.559, p.119966, Article 119966
Main Authors: Lages, J., Rizzo, A.L., Aiuppa, A., Samaniego, P., Le Pennec, J.L., Ceballos, J.A., Narváez, P.A., Moussallam, Y., Bani, P., Schipper, C. Ian, Hidalgo, S., Gaglio, V., Alberti, E., Sandoval-Velasquez, A.
Format: Article
Language:English
Subjects:
Andean Volcanic Belt
Crustal thickness
Earth Sciences
Fluid inclusions
Helium
Noble gases
Northern Volcanic Zone
Sciences of the Universe
Volcanology
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Summary: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 
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2020.119966