The question was "Does it?" You had a complete answer. I hadn't heard about limestone and serpintinization, so that was new to me. I recall a Thomas Gold surmise about reactions between silicon carbide and water, to produce silicon dioxide (sand) and hydrocarbons---a combination apparently typical of petroleum domes. I like Larin's theory because of its completeness and detail, and the fact that upwelling hydrogen would naturally carry along oxygen (water), nitrogen (ammonia), sulfur (hydrogen sulfide), phosphorus (phosphine), and so on, to the Earth's crust and surface. No problem. Thanks for sharing.