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Influence of mantle redox state on the atmospheric composition of rocky planets

Ortenzi, G. and Noack, L. and Sohl, F. (2019) Influence of mantle redox state on the atmospheric composition of rocky planets. Paneth Kolloquium, 29.Oct.-31.Oct. 2019, Nördlingen, Germany.

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Abstract

The mantle redox state is a crucial parameter to investigate the volatile composition during volcanic outgassing and to demonstrate the connection between the mantle and the atmosphere. We investigate the volatile transition from the interior to the atmosphere during the early Earth history as well as for rocky planets with different sizes. We simulate: the mantle-melt volatile partitioning, the gas chemical speciation during degassing and the outgassed atmospheric composition. Starting from the mantle-melt volatile partitioning, our results show that the CO32- partitioning is inhibited in reducing states while the carbonate partitioning is favored in oxidising conditions. Once the melt reaches the surface, we simulate the gas chemical speciation. According to the volatile content of the melt, under reducing conditions the main outgassed species are CO, H2 and H2O while H2O and CO2 dominate the oxidising case. Lastly, calculating the atmosphere composition, we show that a reducing scenario generates lower atmospheric pressure and larger atmospheric thickness compared to an oxidised redox state.

Item URL in elib:https://elib.dlr.de/131714/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of mantle redox state on the atmospheric composition of rocky planets
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ortenzi, G.gianluigi.ortenzi (at) dlr.deUNSPECIFIED
Noack, L.Department of Earth Sciences / Institute of Geological Sciences, Free University BerlinUNSPECIFIED
Sohl, F.frank.sohl (at) dlr.deUNSPECIFIED
Date:2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Mantle Redox State, Atmosphere, Chemical Speciation, Exoplanets
Event Title:Paneth Kolloquium
Event Location:Nördlingen, Germany
Event Type:international Conference
Event Dates:29.Oct.-31.Oct. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Ortenzi, Gianluigi
Deposited On:02 Dec 2019 09:41
Last Modified:02 Dec 2019 09:41

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