O meandrach związanych z naturą metanu na MarsieUNDERSTANDING THE ORIGIN OF METHANE ON MARS THROUGH ISOTOPIC AND MOLECULAR DATA FROM NOMAD (EXOMARS): WILL THERE BE MORE ANSWERS OR QUESTIONS?G. Etiope Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy, 27–28 February 2018, ESAC Madrid, Spain
(...) In particular, it has been considered that 12C-enriched CH4 and high CH4/C2H6 ratios on Mars may indicate the existence of microbial activity, while 13Cenriched CH4 should be attributed to abiotic (inorganic) gas [1,2]. But things are not exactly like that. The interpretation of isotopic and molecular gas data is not straightforward: not on Earth, and even less on Mars. (...)
On Mars, CH4 oxidation, especially by hydrogen peroxide in the regolith, can increase the δ 13C value, transforming an apparent “microbial” signature into an “abiotic” one (Fig.1). (...)
Atmospheric and geological analysis can add insight into gas origins, but in future missions, direct gas detection in the Martian subsoil, coupled with a better knowledge of subsurface geology (type of rocks, permeability, temperatures) should reduce the interpretative uncertainties. (...)
https://www.cosmos.esa.int/documents/1499429/1583871/Etiope_G.pdfHipoteza o abiotycznej genezie metanu na ZiemiFire-Breathing Mountain Fueled by Mysterious Deep-Earth Methane ProductionBy Brandon Specktor, Senior Writer | May 2, 2019 01:25pm ET
(...) It is, however, a somewhat mysterious one. In the new study, Etiope lists the various hypotheses that have been offered to explain how methane might emerge from the deep Earth without any organic carbon involved. The explanations point to everything from cooling magma to steamy, deep-Earth minerals to primordial meteorites that delivered methane to Earth during the planet's formation. But the most widely cited theory involves a process called serpentinization.
This process occurs when water seeps through certain kinds of minerals in Earth's mantle, causing a metamorphic reaction that results in the release of hydrogen gas (H2). This molecular hydrogen may subsequently react with carbon gas (CO or CO2) in the deep Earth, resulting in the creation of methane. In the case of the Flames of Chimaera, Klein wrote, carbon-dioxide-rich limestone reacts with hydrogen-heavy serpentinized rocks that were bathed in rainwater. Hence, two millennia of mountainside fire farts. (...)
https://www.livescience.com/65386-abiotic-methane-makes-mountains-breathe-fire.htmlhttps://www.iflscience.com/space/scientists-confirm-existence-of-methane-on-mars/https://www.nature.com/articles/s41561-019-0331-9