Noble gas variation during partial crustal melting and magma ascent processes

Álvarez-Valero, Antonio M.; Sumino, Hirochika; Burgess, R.; Núñez-Guerrero, Elena; Okumura, Satoshi; Borrajo, Javier; Rodríguez, José Antonio Lozano

doi:10.1016/j.chemgeo.2021.120635

Cited by 4 publications

(2 citation statements)

References 125 publications

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“…The geochemical information contained in subvolcanic volatiles is one of the cornerstones (together with seismicity and deformation) in monitoring active volcanoes and allows a modern understanding of the processes controlling the magmatic evolution at depth and related degassing mechanisms (e.g., 2,[6][7][8][9] ). The information obtained from noble gas studies can be implemented into volcanic hazards assessment because magma dynamics in the volcanic plumbing systems and injection of fresh and undegassed magmas into subvolcanic reservoirs are key mechanisms triggering an eruptive event (e.g., 10 ).…”

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confidence: 99%

Noble gas isotopes reveal degassing-derived eruptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity

Álvarez-Valero

Sumino

Caracausi

et al. 2022

Sci Rep

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Deception Island is one of the most active volcanoes in Antarctica with more than twenty explosive eruptions in the past two centuries. Any future volcanic eruption(s) is a serious concern for scientists and tourists, will be detrimental to marine ecosystems and could have an impact to global oceanographic processes. Currently, it is not possible to carry-out low and high frequency volcanic gas monitoring at Deception Island because of the arduous climatic conditions and its remote location. Helium, neon and argon isotopes measured in olivine samples of the main eruptive events (pre-, syn- and post caldera) offer insights into the processes governing its volcanic history. Our results show that: (i) ascending primitive magmas outgassed volatiles with a MORB-like helium isotopic signature (3He/4He ratio); and (ii) variations in the He isotope ratio, as well as intensive degassing evidenced by fractionated 4He/40Ar* values, occurred before the beginning of the main eruptive episodes. Our results show how the pre-eruptive noble gas signals of volcanic activity is an important step toward a better understanding of the magmatic dynamics and has the potential to improve eruption forecasting.

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confidence: 99%

Noble gas isotopes reveal degassing-derived eruptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity

Álvarez-Valero

Sumino

Caracausi

et al. 2022

Sci Rep

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“…Helium derived from few cold CO 2 -rich mineral springs within the central Tien Shan (Atbashi Range, #22, 23, 24, Table S3) represents a typical mantle-derived helium signature ( 3 He/ 4 He = 6.0 × 10 −6 -2.4 × 10 −6 ). The other CO 2 -rich waters from the Pamir (#47) and the South Tien Shan (#26, 27) with 3 He/ 4 He ratio vary from 0.1 to 0.4 Ra, and a 4 He/ 20 Ne ratio from 1 to 3000 indicates both MORB and radiogenic components (e.g., [87][88][89][90]). This means that small parts of deep sourced He and Ne are added in these samples because the concentrations of He and Ne in meteoric water are low and easily changed by the addition of other sourced He and Ne.…”

Section: Chemical and Isotopic Composition Of Gasesmentioning

confidence: 99%

Geochemistry of Thermal and Cold Mineral Water and Gases of the Tien Shan and the Pamir

Челноков

Lavrushin

Bragin

et al. 2022

Water

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This study presents the first regional hydrogeochemical portrait of the mineral waters and associated gases of the Central Asia region, shaped by the Tien Shan and the Pamir. A geochemical survey of more than 50 fluid discharges from the Northern Tien Shan to the Pamir was carried out between 2018 and 2019. Isotopic (δD, δ18O, d15N2, d13CCO2, d13CCH4) and chemical data allow elucidating fluid genesis and general evolution in the continental collision zone. Geothermometric estimations as well as the content of the chemical components in waters (Cl, Li, B, Br) and gases (N2, CO2) suggest that the studied waters are not related to the presence of any active hydrothermal systems at shallow depth. Silica and cation geothermometers along with thermodynamic equilibrium calculations indicate that the temperature of unmixed deep fluids does not exceed 110 to 150 °C. The determination of d15N2 and d13CCO2 has revealed that the mantle genesis of gas flux matches with the areas of CO2-rich waters manifestations. The dislocation of mineral and thermal waters of Central Asia along the major regional tectonic structures is provided by topographically driven and well-developed long circulation of waters at the depth of 1 to 4 km.

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The role of mantle melting in granite-associated hydrothermal systems: He–Ar isotopes in fluids responsible for Sn–Ag–Pb–Zn mineralization in northeast China

et al. 2023

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Noble gas variation during partial crustal melting and magma ascent processes

Cited by 4 publications

References 125 publications

Noble gas isotopes reveal degassing-derived eruptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity

Noble gas isotopes reveal degassing-derived eruptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity

Geochemistry of Thermal and Cold Mineral Water and Gases of the Tien Shan and the Pamir

The role of mantle melting in granite-associated hydrothermal systems: He–Ar isotopes in fluids responsible for Sn–Ag–Pb–Zn mineralization in northeast China

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