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Modelling the composition of volcanic gases on young terrestrial planets in the C-H-O-N-S system

Brachmann, C. und Noack, L. und Sohl, F. (2021) Modelling the composition of volcanic gases on young terrestrial planets in the C-H-O-N-S system. German-Swiss Geodynamics Workshop 2021, 2021-08-30 -- 2021-09-01, Bad Belzig, Germany.

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Offizielle URL: http://geodyn-chic.de/geodynamics-ws-2021

Kurzfassung

Subsequently to the magma ocean state, secondary atmospheres build up via early volcanic degassing of planetary interiors. The terrestrial planets Venus, Earth and Mars are believed to have originated from similar source material but reveal different present-day atmospheric compositions, pressures and temperatures. To investigate how such diverse atmospheres emerge, we have developed a model that allows us to compute the molar fractions of gases involved in volcanic degassing. 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. We consider the influence of temperature, pressure, oxygen fugacity and melt composition on the solubility of each phase as well as the speciation of all phases and fitted these parameters 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 and that hence, varying parameters like planet mass, atmospheric pressure, tectonic regime, volatile budget or the abundance of heat sources can lead to significantly different atmospheric compositions and degassing rates.

elib-URL des Eintrags:https://elib.dlr.de/145545/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Modelling the composition of volcanic gases on young terrestrial planets in the C-H-O-N-S system
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Brachmann, C.caroline.brachmann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Noack, L.Department of Earth Sciences, Freie Universitat Berlin, Malteserstraβe 74-100, 12249, Berlin, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sohl, F.frank.sohl (at) dlr.dehttps://orcid.org/0000-0003-0355-1556NICHT SPEZIFIZIERT
Datum:31 August 2021
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Early Earth, Mars, redox state, volcanic degassing, volatile chemical speciation, solubility, C-H-O-N-S system
Veranstaltungstitel:German-Swiss Geodynamics Workshop 2021
Veranstaltungsort:Bad Belzig, Germany
Veranstaltungsart:Workshop
Veranstaltungsdatum:2021-08-30 -- 2021-09-01
Veranstalter :Deutsche Geophysikalische Gesellschaft
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:12 Nov 2021 07:32
Letzte Änderung:12 Nov 2021 07:32

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