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Geochemical Complexity in Terrestrial Hot Spring Fields: Implications for the Origin of Life
Martin J Van Kranendonk1, Laura K Penrose2, Jeff Havig3,4
1Australian Centre for Astrobiology and School of Biological, Earth and Environmental Sciences, University of New South Wales Sydney, Kensington, New South Wales, Australia.
Astrobiology
|March 30, 2026
Summary
Terrestrial hot springs, like New Zealand's Taupō Volcanic Zone, offer complex chemical conditions crucial for the origin of life. Their dynamic, diverse pools concentrate elements and promote polymer formation, unlike diluted ocean vents.
Area of Science:
- Origin of Life Studies
- Geochemistry
- Astrobiology
Background:
- Prebiotic chemistry requires complex chemical and mineralogical conditions for polymer formation and trace element concentration.
- Submerged ocean hydrothermal vents face dilution issues, hindering the development of necessary complexity.
- Terrestrial hot springs offer wet-dry cycling and element concentration but are sometimes dismissed due to high temperatures and perceived static conditions.
Purpose of the Study:
- To investigate the geochemical complexity of terrestrial hot spring fields as potential sites for the origin of life.
- To contrast the conditions in the Taupō Volcanic Zone (TVZ) with submerged hydrothermal vents.
- To highlight the dynamic and diverse nature of the TVZ's hot spring systems.
Main Methods:
- Comparative analysis of geochemical conditions in terrestrial hot springs versus deep-sea hydrothermal vents.
- Characterization of physico-chemical attributes and fluid mixing dynamics within the TVZ hot spring field.
- Assessment of wet-dry cycling and element concentration mechanisms in hot spring environments.
Main Results:
- The TVZ hot spring field exhibits exceptional geochemical diversity and dynamism due to numerous closely located pools with variable conditions.
- These diverse pools facilitate element concentration, wet-dry cycling, and fluid mixing, creating conditions favorable for prebiotic chemistry.
- Mineral precipitation within the TVZ enhances the preservation of potential biosignatures.
Conclusions:
- Terrestrial hot spring fields, particularly dynamic ones like the TVZ, present a more compelling case for the origin of life than previously thought.
- The TVZ's unique combination of geochemical complexity, element concentration, and wet-dry cycling supports prebiotic chemical evolution.
- These findings challenge the "Warm Little Pond" concept and highlight the importance of dynamic, complex environments for life's emergence.
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