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Volatile degassing and chemical speciation of the C-O-H system in the Earth Magma Ocean scenario

Ortenzi, G. and Sohl, F. and Noack, L. (2018) Volatile degassing and chemical speciation of the C-O-H system in the Earth Magma Ocean scenario. 7th Joint Workshop on High Pressure, Planetary, and Plasma Physics, 2018-10-10 - 2018-10-12, Berlin, Germany.

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During the early phase of its evolution the Earth was likely characterized by the presence of a magma ocean or several large magma ponds. In this period there was a strong interaction between the interior differentiation process, the silicate melt phase and the atmosphere. The aim of this research is to investigate the degassing of volatiles in the C-O-H system in the presence of a magma ocean and the subsequent development of the early Earth's atmosphere. The volatile outgassing and the chemical speciation were investigated throughout numerical model simulations. Specifically, we analyze the volatile transition from the mantle to the atmosphere by using the equilibrium and mass balance method. The most representative reactions for the outgassing process are simulated at pressures, temperatures and redox states which are characteristic for the magma ocean scenario. The gas chemical speciation is deeply influenced by both the thermodynamic properties and the redox state. In a reduced ambient and for low temperatures the main gas species are: CO, CH4 and H2. On the other hand in oxidizing condition the principal gas species are H2O and CO2. In addition, the pressure played a central role during the evolution of the magma ocean and the crust formation. The pressure has a strong effect on the solubility of the gas phases within the silicate melt and the related availability of outgassed volatile species. Lastly, considering an extension of the present scope, this analytical technique has the potential also to characterize the volatile behavior of planetary bodies subject to high internal pressures such as massive solid exoplanets.

Item URL in elib:https://elib.dlr.de/122603/
Document Type:Conference or Workshop Item (Speech)
Title:Volatile degassing and chemical speciation of the C-O-H system in the Earth Magma Ocean scenario
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ortenzi, G.gianluigi.ortenzi (at) dlr.deUNSPECIFIED
Sohl, F.frank.sohl (at) dlr.deUNSPECIFIED
Noack, L.Department of Earth Sciences / Institute of Geological Sciences, Free University BerlinUNSPECIFIED
Date:11 October 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Early Earth, magma ocean, volcanic degassing, chemical speciation, C-O-H system.
Event Title:7th Joint Workshop on High Pressure, Planetary, and Plasma Physics
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:2018-10-10 - 2018-10-12
Organizer:DLR Institut für Planetenforschung
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: Sohl, Frank
Deposited On:30 Oct 2018 15:47
Last Modified:30 Oct 2018 15:47

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