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Volcanic Gas Speciation in the C-H-O-N-S System on Terrestrial Planets

Brachmann, C. and Noack, L. and Sohl, F. (2021) Volcanic Gas Speciation in the C-H-O-N-S System on Terrestrial Planets. Goldschmidt Conference 2021, 2021-07-04 -- 2021-07-09, Lyon, France (virtuelle Konferenz).

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Understanding the gas chemical speciation during magma ascent and degassing is crucial when trying to explain the build-up of secondary atmospheres on young planets. We simulate the gas chemical speciation in the C-H-O-N-S system since C-H-O-S volatiles can be stored in significant amounts in basaltic magmas and therefore make up about 95 % of the magmatic gases released by volcanoes on earth. Because of its important role in the terrestrial atmosphere Nitrogen was added to our calculations as well. In consideration of the solubility of each phase in the magma, temperature, pressure, oxygen fugacity and melt composition were varied and fitted to conditions present on early Earth and Mars. We show that oxygen fugacity has a major influence on the gas composition during degassing due to its important influence not just on the speciation of all volatiles but also on the solubility of Nitrogen and Sulfur in the magma. According to the volatile content of the melt, under reducing conditions H2, CO, H2S, S2 and NH3 are the main outgassed species, while H2O, CO2 and SO2 and N2 dominate in the oxidizing case. We furthermore show that the temperature and pressure conditions of the source region in which the magma is formed and the chemical composition of the magma itself also play a key role in the chemical composition of volcanic gasses.

Item URL in elib:https://elib.dlr.de/143198/
Document Type:Conference or Workshop Item (Poster)
Title:Volcanic Gas Speciation in the C-H-O-N-S System on Terrestrial Planets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Brachmann, C.caroline.brachmann (at) dlr.deUNSPECIFIED
Noack, L.Department of Earth Sciences, Freie Universitat Berlin, Malteserstraβe 74-100, 12249, Berlin, GermanyUNSPECIFIED
Sohl, F.frank.sohl (at) dlr.dehttps://orcid.org/0000-0003-0355-1556
Date:6 July 2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Early Earth, Mars, redox state, volcanic degassing, volatile chemical speciation, solubility, C-H-O-N-S system
Event Title:Goldschmidt Conference 2021
Event Location:Lyon, France (virtuelle Konferenz)
Event Type:international Conference
Event Dates:2021-07-04 -- 2021-07-09
Organizer:Geochemical Society and the European Association of Geochemistry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Sohl, Frank
Deposited On:03 Aug 2021 08:15
Last Modified:03 Aug 2021 08:15

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