The noble gas signature of the 2021 Tajogaite eruption (La Palma, Canary Islands)

Sandoval-Velasquez, A.; Rizzo, A.L.; Casetta, F.; Ntaflos, T.; Aiuppa, A.; Alonso, M.; Padrón, E.; Pankhurst, M.J.; Mundl-Petermeier, A.; Zanon, V.; Pérez, N.M.

doi:10.1016/j.jvolgeores.2023.107928

Cited by 8 publications

(7 citation statements)

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“…In fact, petrographic observations showed that San Antonio peridotites trapped secondary FI whose origin would be related to mantle metasomatism (see Supplementary Material); in all peridotites (clinopyroxenites, harzburgites and dunite) FI trails typically originate from glass microveins permeating the rocks or are intimately associated with reaction rims (composed of secondary olivine, clinopyroxene and glass) around primary orthopyroxenes. When considering the consistency of δ 13 C values in both lavas (basanites; Sandoval-Velasquez et al, 2023) and xenoliths, and the composition of the interstitial glass found in San Antonio peridotites, the above-mentioned metasomatism seems to be associated with the infiltration of the lithospheric mantle by basanitic/trachitic melts (see Sandoval-Velasquez et al, 2023), the latter probably generated in a deep mantle region (asthenosphere) similar to that feeding the recent volcanism of La Palma.…”

Section: Resultsmentioning

confidence: 98%

“…The carbon concentration and isotope data presented here stand on the results of initial FI screening and noble gas investigations (Sandoval Velasquez et al, 2022b;Sandoval-Velasquez et al, 2023). Based on these results, we selected the aliquots with the highest concentrations (> 1.0 × 10 −7 mol/g) of CO 2 (n = 14) to determine the carbon isotopic composition of FI trapped in Tajogaite and San Antonio rocks.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…We added to this set one lava sample and 9 xenoliths (3 pyroxenites, and 6 peridotite xenoliths) from the historical San Antonio volcano (Figure 1). Detailed information about sampling, petrology, FI composition and noble gas-Sr-Nd-W systematics of the samples are provided in a companion article (Sandoval-Velasquez et al, 2023). Finally, 4 representative peridotite xenoliths (spinel harzburgites) from Lanzarote, already characterized in terms of petrography and mineral chemistry (Siena et al, 1991), were also integrated in this study to determine the concentration and isotopic signature of C in olivine-and clinopyroxene-hosted FI.…”

Section: Samples and Methodsmentioning

confidence: 99%

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2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

Sandoval-Velasquez,

Casetta,

Ntaflos

et al. 2024

Front. Earth Sci.

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The 2021 Tajogaite eruption at La Palma has represented a unique opportunity to investigate the characteristics of the mantle source feeding modern volcanism in the Canary Islands. With the aim of track the fingerprint of carbon in the local oceanic lithosphere-asthenosphere system, we report the isotopic composition of CO2 (δ13C values versus Vienna Pee Dee Belemnite) in olivine- and clinopyroxene-hosted fluid inclusions (FI) from the 2021 Tajogaite lavas and from lavas/ultramafic xenoliths (olivine-clinopyroxenites, clinopyroxenites, dunites and harzburgites) from the nearby 1677 San Antonio eruption cone/lavas, in an attempt to characterize the origin and evolution of carbon within the local mantle source. Our results indicate that the 2021 and 1677 lavas exhibit δ13C values ranging from −4.94‰ to −2.71‰ and CO2/3He ratios from 3.37 to 6.14 × 109. Ultramafic xenoliths fall in a comparable range of values despite showing higher CO2 concentrations. Our δ13C values fall within the range of carbon isotope results previously reported for the Dos Aguas cold spring located in the Taburiente Caldera (northern La Palma), suggesting an apparent carbon isotope homogeneity at the scale of the entire island. The (relatively narrow) δ13C vs. CO2/3He ratio range of La Palma samples is interpreted to reflect either i) variable extents of open-system degassing of a common mantle endmember having δ13C of ∼1.7‰, or ii) mixing between depleted mantle-like carbon (−6‰ < δ13C < −4‰) and crustal carbon (δ13C = 0‰) endmembers. Both models testify a crustal carbon component recycled in the local mantle. This component, also detected in mantle xenoliths from the neighboring island of El Hierro and the easternmost Lanzarote, indicates a regional characteristic of the mantle beneath the Canary Islands, interpreted as a result of infiltration of carbon-rich melts during past metasomatic events in the local mantle.

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Section: Resultsmentioning

confidence: 98%

Section: Samples and Methodsmentioning

confidence: 99%

Section: Samples and Methodsmentioning

confidence: 99%

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2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

Sandoval-Velasquez,

Casetta,

Ntaflos

et al. 2024

Front. Earth Sci.

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“…In situ Sr isotope data traces two distinct magma batches, and identifies a colder, more radiogenic, evolved crystal mush at the beginning of the eruption (high 87 Sr/ 86 Sr in andesine) and a less radiogenic, mafic melt (lower 87 Sr/ 86 Sr in labradorite microcrysts) (Ubide et al., 2023). Melt inclusion compositions along with isotope studies (Day et al., 2022; Sandoval‐Velasquez et al., 2023; Ubide et al., 2023) identify the exhumation of this new batch of less fractionated magma in November 2021 (Day et al., 2022; Ubide et al., 2023) recorded by the change in CaO/Al 2 O 3 versus SiO 2 of lava around day 50 of the eruption and is sampled by melt inclusions within the high Mg# olivine population in LM0 (Figure 3b).…”

Section: Discussionmentioning

confidence: 99%

Magmatic Storage and Volatile Fluxes of the 2021 La Palma Eruption

Dayton,

Gazel,

Wieser

et al. 2024

Geochem Geophys Geosyst

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The 2021 La Palma eruption (Tajogaite) was unprecedented in magnitude, duration, and degree of monitoring compared to historical volcanism on La Palma. Here, we provide data on melt inclusions in samples from the beginning and end of the eruption to compare the utility of both melt and fluid inclusions as recorders of magma storage. We also investigated compositional heterogeneities within the magmatic plumbing system. We found two populations of olivine crystals: a low Mg# (78–82) population present at the beginning and end of eruption, recording the maximum volatile contents (2.5 wt % H2O, 1,800 ppm F, 700 ppm Cl, 3,800 ppm S) and a higher Mg# (83–86) population sampled toward the end of the eruption, with lower volatile contents. Despite their host composition, melt inclusions share the same maximum range of CO2 concentrations (1.2–1.4 wt %), indicating olivine growth and inclusion capture at similar depths. Overall, both melt and fluid inclusions record similar pressures (450–850 MPa, ∼15–30 km), and when hosted in the same olivine crystal pressures are indistinguishable within error. At these mantle pressures, CO2 is expected to be an exsolved phase explaining the similar range of CO2 between the two samples, but other volatile species (F, Cl, S) behave incompatibly, and thus, the increase between the two olivine populations can be explained by fractional crystallization prior to eruption. Finally, based on our new data, we provide estimates on the total volatile emission of the eruption.

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“…However, perhaps because the H 2 O has been lost in many cases, and even with heating, quantification is challenging, the majority of fluid inclusion studies simply pick a fixed value of 𝑋 H 2 O (e.g. 0.1 for Forte et al [2023], Sandoval-Velasquez et al [2023], and Zanon et al [2024]). More recently, DeVitre and Wieser 2024 determine 𝑋 H 2 O as a function of pressure for the volcanic system of interest using melt inclusion measurements (many solubility models used to calculate saturation pressures also calculate 𝑋 H 2 O at the point of vapour saturation [e.g.…”

Section: Co 2 -H 2 O Eosmentioning

confidence: 99%

DiadFit: An open-source Python3 tool for peak fitting of Raman data from silicate melts and CO2 fluids

Wieser,

DeVitre

2024

Volcanica

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We present DiadFit—an open-source Python3 tool for efficient processing of Raman spectroscopy data collected from fluid inclusions, melt inclusions and silicate melts. DiadFit is optimized to fit the characteristic peaks from CO2 fluids (Fermi diads, hot bands, 13C), gas species such as SO2, N2, solid precipitates (e.g. carbonates), and Ne emission lines with easily tweakable background positions and peak shapes. DiadFit's peak fitting functions are used as part of a number of workflows optimized for quantification of CO2 in melt inclusion vapour bubbles and fluid inclusions. DiadFit can also convert between temperature, pressure and density using various CO2 and CO2-H2O equations of state (EOS), allowing calculation of fluid inclusion pressures (and depths in the crust), conversion of homogenization temperatures from microthermometry to CO2 density, and propagation of uncertainties associated with EOS calculations using Monte Carlo methods. There are also functions to quantify the area ratio of the silicate vs. H2O region of spectra collected on silicate glasses to determine H2O contents in glasses and melt inclusions. Documentation and worked examples are available (https://bit.ly/DiadFitRTD, https://bit.ly/DiadFitYouTube).

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The noble gas signature of the 2021 Tajogaite eruption (La Palma, Canary Islands)

Cited by 8 publications

References 80 publications

2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

2021 Tajogaite eruption records infiltration of crustal fluids within the upper mantle beneath La Palma, Canary Islands

Magmatic Storage and Volatile Fluxes of the 2021 La Palma Eruption

DiadFit: An open-source Python3 tool for peak fitting of Raman data from silicate melts and CO2 fluids

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