Forget the deep ocean: life may have begun in volcanic hot springs
In short: For decades, scientists believed life emerged in the dark, pressurized depths of the sea. However, new evidence from the Australian desert suggests a much warmer, terrestrial beginning. A discovery in ancient volcanic rocks is fundamentally rewriting the timeline and the location of Earth's first biological experiments.
Since 1977, the prevailing theory suggested that life originated near hydrothermal vents on the Pacific Ocean floor. The discovery of the submarine Alvin revealed ecosystems thriving around vents pumping out methane, hydrogen, and sulfur. These deep-sea environments were thought to be ideal havens, protected from the massive planetary cataclysms that occurred roughly four billion years ago.
However, a significant flaw exists in the deep-sea model: the vast volume of the ocean may cause essential molecules to dilute too rapidly to interact. For life to form, molecules must concentrate enough to build cell membranes and primitive metabolisms. Recent findings by astrobiologist Tara Djokic and her team suggest that terrestrial environments might have been far more efficient at this concentration process.
The team identified 3.48-billion-year-old sedimentary rocks within the Dresser Formation in Australia's Pilbara region. These rocks contain geyserite—wrinkled orange and white layers formed by volcanic geysers. Within these layers, researchers found bubbles that likely formed when gas was trapped by a sticky film of bacterial-like microorganisms. This suggests that volcanic hot springs on land provided the perfect cycle of wetting and drying to catalyze complex chemical reactions.
This cycle of evaporation and rehydration allows simple units to form polymers and then maroon them in tiny cavities. These concentrated pockets of fatty acids could serve as the prototypes for the first cell membranes, providing a much more stable laboratory for the origin of life than the vast, open ocean.
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Sources
- Summary by Intellect · source: This ancient rock is changing our theory on the origin of life | Tara Djokic
- Also: Life on Earth Came from a Hot Volcanic Pool, Not the Sea, New Evidence Suggests | Scientific American
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