Today rich biological communities occur near deep sea vents...
giant tube worms, crabs, eels, and thermophilic bacteria.
chemosynthesis (abiogenesis) may have helped life originate in vent-like regions,
producing first biomolecules, metabolic reactions., and metabolism...
In 2007 Timothy Kusky and colleagues discovered 1.43 billion-year old fossils of deep sea
microbes near deep sea vents providing further support that life might have originated there.
But Boussa et al speculated in Nature (2008), since RNA is particularly sensitive to heat,
it suggests that a LUCA would need to find a cooler micro-climate to develop.
Yet, N. Lartillot argues that LUCA might have lived in a cooler micro-climate near the vents
allowing RNA-like molecules to evolve. [ reference ]