Main Question or Discussion Point
could earth's early magnetic field have been strong enough to trap hydrogen within the atmosphere?
Not any longer, since early mantle convection is now known to give local environments with the necessary redox differences. (Often around hydrothermal vents as they pass the differentiated and serpentinized minerals.) Instead a near neutral atmosphere would be conducive for life emergence, since the CO2 generates a slightly acidic ocean that contrasts to the mantle convection alkaline conditions and makes (local) organic production effective. Such conditions may seem constraining (less global organic production), but in fact increase the likelihood for life elsewhere since especially ice moons with oceans but also early cold, wet bodies like Mars have them.Interesting question, Daniel. Are you wondering if this could have given the early atmosphere reducing properties, a condition often thought necessary for abiogenesis?