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dc.contributor.authorRinaldi, Michele
dc.contributor.authorMikhail, Sami
dc.contributor.authorSverjensky, Dimitri A.
dc.identifier.citationRinaldi , M , Mikhail , S & Sverjensky , D A 2024 , ' Metasomatism is a source of methane on Mars ' , Earth and Planetary Science Letters , vol. 634 , 118672 .
dc.identifier.otherORCID: /0000-0001-5276-0229/work/157140687
dc.descriptionMR and SM acknowledge support from NERC standard grant (NE/PO12167/1) and UK Space Agency Aurora grant (ST/T001763/1). DAS acknowledges support by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Geosciences program under Award Number DE-SC0019830 as well as NSF Petrology and Geochemistry Grant Number 2032039.en
dc.description.abstractThe abundance of inactive Martian volcanic centres suggests that early Mars was more volcanically active than today. On Earth, volcanic degassing releases climate-forcing gases such as H2O, SO2, and CO2 into the atmosphere. On Mars, the volcanic carbon is likely to be more methane-rich than on Earth because the interior is, and was, more reducing than the present-day Terrestrial upper mantle. The reports of reduced carbon associated with high-temperature minerals in Martian igneous meteorites back up this assertion. Here, we undertake irreversible reaction path models of the fluid-rock interaction to predict carbon speciation in magmatic fluids at the Martian crust-mantle boundary. We find methane is a major carbon species between 300 and 800 °C where logfO2 is set at the Fayalite = Magnetite + Quartz redox buffer reaction (FMQ). When logfO2 is below FMQ, methane is dominant across all temperatures investigated (300–800 °C). Moreover, ultramafic rocks produce more methane than mafic lithologies. The cooling of magmatic bodies leads to the release of a fluid phase, which serves as a medium within which methane is formed at high temperatures and transported. Metasomatic methane is, therefore, a source of reduced carbonaceous gases to the early Martian atmosphere and, fundamentally, for all telluric planets, moons, and exoplanets with Mars-like low logfO2 interiors.
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.subjectThermodynamic modellingen
dc.subjectSDG 13 - Climate Actionen
dc.titleMetasomatism is a source of methane on Marsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.contributor.institutionUniversity of St Andrews. St Andrews Isotope Geochemistryen
dc.description.statusPeer revieweden

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