6533b7d9fe1ef96bd126d691
RESEARCH PRODUCT
Noble gas magmatic signature of the Andean Northern Volcanic Zone from fluid inclusions in minerals
V. GaglioAndrea Luca RizzoSilvana HidalgoPhilipson BaniAndres Sandoval-velasquezJ. L. Le PennecAlessandro AiuppaAlessandro AiuppaE. AlbertiP.a. NarváezYves MoussallamYves MoussallamPablo SamaniegoJ. LagesC. Ian SchipperJ.a. Ceballossubject
010504 meteorology & atmospheric sciencesGeochemistryAndean Volcanic Belt Helium voclanic gases Crustal thickness Fluid inclusions Helium Noble gases Northern Volcanic Zoneengineering.material010502 geochemistry & geophysics01 natural sciencesHeliumMantle (geology)Noble gaseGeochemistry and Petrology[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/VolcanologyCrustal thickneFluid inclusions[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environmentVolatilesFluid inclusions0105 earth and related environmental sciencesgeographygeography.geographical_feature_categoryOlivineSubductionGeologyNorthern Volcanic ZoneFluid inclusionNoble gasesCrustal thicknessVolcanoAndean Volcanic BeltengineeringPhenocrystGeologydescription
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 He-3/He-4 ratios of 7.0-7.4 R-A, within the MORB range (8 +/- 1 R-A). With exception of the Cotopaxi lavas (opx = 50 km at the Ecuadorian arc segment) may factor largely into the variability recorded on our data set. The first CO2/He-3 ratios obtained in FIs from Andean rocks support the hypothesis of increasing crustal contamination from Colombia to Ecuador, concomitant with increasing crustal thicknesses under the respective arc regions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-01 |