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Serpentinites and the Origin of Life

Presented by Ron Frost, University Wyoming                                                               One of the great mysteries in geology is “How did life begin”? Darwin in a letter to a friend Joseph Hooker in 1871 postulated that life could have begun in a warm pond full of ammonia and phosphorous salts where proteins slowly developed. The problem with this is that though the early atmosphere on Earth was reducing, the impact of light waves on Fe2+ in the warm pond would convert it to Fe3+, making the pool too oxidizing for complex organic compounds to survive. What’s more, without the ozone layer, the surface of the early Earth would have been bathed in UV radiation. This means that the most likely locality for the origin of life is in submarine vents. The most reducing environment on Earth is found in the submarine vents emitting fluids that are associated with the formation of serpentinites.  The production of magnetite during serpentinization explains why the fluids from some sea floor vents are so reducing that they contain hydrogen and methane. In this environment, they are protected by kilometers of ocean water from the withering ultraviolet radiation that bathed the surface of the planet where life began.