Guimond, C.M. und Noack, L. und Ortenzi, G. und Sohl, F. (2021) Low volcanic outgassing rates for a stagnant lid Archean earth with graphite-saturated magmas. Physics of the Earth and Planetary Interiors, 320 (106788), Seite 106788. Elsevier. doi: 10.1016/j.pepi.2021.106788. ISSN 0031-9201.
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Offizielle URL: https://www.sciencedirect.com/science/article/abs/pii/S0031920121001461
Kurzfassung
Volcanic gases supplied a large part of Earth's early atmosphere, but constraints on the value of this flux are scarce. Here we model how C-O-H outgassing could have evolved through the late Hadean and early Archean, under the conditions that global plate tectonics had not yet initiated, all outgassing was subaerial, and graphite was the stable carbon phase in the melt source regions. The model fully couples numerical mantle convection, partitioning of volatiles into the melt, and chemical speciation in the gas phase. The mantle oxidation state (which may not have reached late Archean values in the Hadean) is the dominant control on individual species' outgassing rates because it affects both the carbon content of basaltic magmas and the speciation of degassed volatiles. Volcanic gas from mantles more reduced than the iron-wüstite mineral redox buffer would contain virtually no CO2 because (i) carbonate ions dissolve in magmas only in very limited amounts, and (ii) almost all degassed carbon takes the form of CO instead of CO2. For oxidised mantles near the quartz-fayalite-magnetite buffer, we predict median CO2 outgassing rates of less than approximately 5 Tmol yr-1, still lower than the outgassing rates used in many Archean climate studies. Relatively weak outgassing is due in part to the redox-limited CO2 contents of graphite-saturated melts, and also to a stagnant lid regime's inefficient replenishment of upper mantle volatiles. Our results point to certain chemical and geodynamic prerequisites for sustaining a clement climate with a volcanic greenhouse under the Faint Young Sun.
elib-URL des Eintrags: | https://elib.dlr.de/146046/ | ||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||
Zusätzliche Informationen: | Final manuscript version available at https://arxiv.org/abs/2108.13438 | ||||||||||||||||||||
Titel: | Low volcanic outgassing rates for a stagnant lid Archean earth with graphite-saturated magmas | ||||||||||||||||||||
Autoren: |
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Datum: | November 2021 | ||||||||||||||||||||
Erschienen in: | Physics of the Earth and Planetary Interiors | ||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||
Band: | 320 | ||||||||||||||||||||
DOI: | 10.1016/j.pepi.2021.106788 | ||||||||||||||||||||
Seitenbereich: | Seite 106788 | ||||||||||||||||||||
Verlag: | Elsevier | ||||||||||||||||||||
ISSN: | 0031-9201 | ||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||
Stichwörter: | outgassing, secondary atmospheres, mantle redox, early earth, planetary dynamics, mantle convection, numerical modelling | ||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||||||
HGF - Programmthema: | Erforschung des Weltraums | ||||||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||||||
DLR - Forschungsgebiet: | R EW - Erforschung des Weltraums | ||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Exploration des Sonnensystems | ||||||||||||||||||||
Standort: | Berlin-Adlershof | ||||||||||||||||||||
Institute & Einrichtungen: | Institut für Planetenforschung > Planetenphysik | ||||||||||||||||||||
Hinterlegt von: | Sohl, Dr. Frank | ||||||||||||||||||||
Hinterlegt am: | 23 Nov 2021 15:04 | ||||||||||||||||||||
Letzte Änderung: | 24 Nov 2021 14:02 |
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