Zobrazeno 1 - 10 of 71 pro vyhledávání: '"Kenneth T Koga"'
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Akademický článek
CO2‐Undersaturated Melt Inclusions From the South West Indian Ridge Record Surprisingly Uniform Redox Conditions
Autor: Yves Moussallam, Guillaume Georgeais, Estelle F. Rose‐Koga, Kenneth T. Koga, Margaret E. Hartley, Bruno Scaillet, Clive Oppenheimer, Nial Peters
Publikováno v: Geochemistry, Geophysics, Geosystems, Vol 24, Iss 12, Pp n/a-n/a (2023)
Abstract The behavior of Fe3+ during mantle partial melting strongly influences the oxidation state of the resulting magmas, with implications for the evolution of the atmosphere's oxidation state. Here, we challenge a prevailing view that low‐degr
Externí odkaz: https://doaj.org/article/02f4baa26ab44e0c87937be6b4e22ac4
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2
Akademický článek
Tracking slab surface temperatures with electrical conductivity of glaucophane
Autor: Geeth Manthilake, Ye Peng, Kenneth T. Koga, Mainak Mookherjee
Publikováno v: Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
Abstract Slab surface temperature is one of the key parameters that incur first-order changes in subduction dynamics. However, the current thermal models are based on empirical thermal parameters and do not accurately capture the complex pressure–t
Externí odkaz: https://doaj.org/article/87f980eea9234b868cc278e031b04d30
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3
Akademický článek
Magma Decompression Rate Calculations With EMBER: A User‐Friendly Software to Model Diffusion of H2O, CO2, and S in Melt Embayments
Autor: Guillaume Georgeais, Kenneth T. Koga, Yves Moussallam, Estelle F. Rose‐Koga
Publikováno v: Geochemistry, Geophysics, Geosystems, Vol 22, Iss 7, Pp n/a-n/a (2021)
Abstract Magma decompression rate is one of the most important parameters in controlling eruption dynamics. One way to determine decompression rate is by fitting a volatile elements diffusion profile to a concentration gradient in crystal‐hosted em
Externí odkaz: https://doaj.org/article/06b90c09c4964450b18c941ea4c69815
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4
One-atmosphere high-temperature CO–CO2–SO2 gas-mixing furnace: design, operation, and applications
Autor: Shashank Prabha-Mohan, Kenneth T. Koga, Antoine Mathieu, Franck Pointud, Diego F. Narvaez
Publikováno v: European Journal of Mineralogy
European Journal of Mineralogy, 2023, 35 (3), pp.321-331. ⟨10.5194/ejm-35-321-2023⟩
In this paper, we present a new design for a 1 atm gas-mixing furnace using the gas mixture CO–CO2–SO2. This furnace can simulate disequilibrium processes such as magmatic and volcanic degassing. Here, we present the technical aspects of the desi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31b07ad028e9a33d771cb42ae13cbadf
https://doi.org/10.5194/ejm-35-321-2023
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5
Sulfur isotope and trace element systematics in arc magmas: seeing through the degassing via a melt inclusion study of Kyushu Island volcanoes, Japan
Autor: Masataka Kawaguchi, Kenneth T Koga, Estelle F Rose-Koga, Kenji Shimizu, Takayuki Ushikubo, Akira Yoshiasa
Publikováno v: Journal of Petrology
Journal of Petrology, 2022, 63 (7), ⟨10.1093/petrology/egac061⟩
Sulfur is a minor element in magmas but one of the major volatile elements released in volcanic systems, from the magma to the fluid phase upon ascent. Not only are sulfur gasses potentially toxic for humans and plants, they are also involved in caus
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea7746ec2f82f04fccdf336fe61b5c19
https://hal.science/hal-03852651/document
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6
Lithium and boron diffusivity and isotopic fractionation in hydrated rhyolitic melts
Autor: Roberta Spallanzani, Kenneth T. Koga, Sarah B. Cichy, Michael Wiedenbeck, Burkhard C. Schmidt, Marcus Oelze, Max Wilke
Publikováno v: Contributions to Mineralogy and Petrology
Contributions to Mineralogy and Petrology, 2022, 177, ⟨10.1007/s00410-022-01937-2⟩
Lithium and boron are trace components of magmas, released during exsolution of a gas phase during volcanic activity. In this study, we determine the diffusivity and isotopic fractionation of Li and B in hydrous silicate melts. Two glasses were synth
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7b017552b8b3b8290176758956b0c24
https://hal-insu.archives-ouvertes.fr/insu-03777184
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7
Magma decompression rate calculations with EMBER: A user‐friendly software to model diffusion of H 2 O, CO 2 and S in melt embayments
Autor: Yves Moussallam, Estelle Rose-Koga, Guillaume Georgeais, Kenneth T. Koga
Publikováno v: Geochemistry, Geophysics, Geosystems
Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2021, ⟨10.1029/2020GC009542⟩
Geochemistry, Geophysics, Geosystems, 2021, ⟨10.1029/2020GC009542⟩
International audience; Magma decompression rate is one of the most important parameters in controlling eruption dynamics. One way to determine decompression rate is by fitting a volatile elements diffusion profile to a concentration gradient in crys
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e88da4e10d9b3b90280a9314a7c5f9a4
https://hal.uca.fr/hal-03265994/document
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8
How to turn off a lava lake? A petrological investigation of the 2018 intra-caldera and submarine eruptions of Ambrym volcano
Autor: Marie Boichu, Bernard Pelletier, Raphael Grandin, Yves Moussallam, Kenneth T. Koga, Dan Tari, Nial Peters, Philipson Bani, Tara Shreve, Estelle Rose-Koga, Etienne Médard, Guillaume Georgeais
Publikováno v: Bulletin of Volcanology
Bulletin of Volcanology, 2021, 83 (5), ⟨10.1007/s00445-021-01455-2⟩
Bulletin of Volcanology, Springer Verlag, 2021, 83 (5), ⟨10.1007/s00445-021-01455-2⟩
International audience; In December 2018, an unusually large intra- and extra-caldera eruption took place at Ambrym volcano (Vanuatu). The eruption drained the volcano’s five active lava lakes and terminated, at least momentarily, the surface activ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c850547b112c16f9edd6ec20e95af3f7
https://hal.science/hal-03444016
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9
Halogen Bearing Amphiboles, Aqueous Fluids, and Melts in Subduction Zones: Insights on Halogen Cycle From Electrical Conductivity
Autor: Ye Peng, Geeth Manthilake, Kenneth T. Koga, Mainak Mookherjee
Publikováno v: Journal of Geophysical Research : Solid Earth
Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2021, 126 (3), ⟨10.1029/2020JB021339⟩
Journal of Geophysical Research : Solid Earth, 2021, 126 (3), ⟨10.1029/2020JB021339⟩
Co-auteur étranger; International audience; Amphiboles are hydrous minerals that are formed in the oceanic crust via hydrothermal alteration. The partial substitution of halogens for OH− makes amphibole one of the principal hosts of Cl and F in th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a76484e1bc68aff54ac22beb8f1aa005
https://hal.uca.fr/hal-03181956
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