Hydrothermal and oceanic pH conditions of possible relevance to the origin of life
Abstract
Because of the continuous focusing of thermal and chemical energy, ancient submarine hot springs are contenders as sites for the origin of life. But it is generally assumed that these would be of the acid and high-temperature 'black smoker' variety (Corliss et al., 1981). In fact today the greater part of the ocean circulates through off-ridge springs where it issues after modification at temperatures of around 40 degrees C or so but with the potential to reach 200 degrees C. Such offridge or ridge-flank springs remind us that there are other candidate sites for the origin of life. Although there is no firm indication of the pH of these off-ridge springs we have argued that the solutions are likely to be alkaline rather than acid, We test the feasibility of this idea using EQ geochemical water-rock interaction modelling codes (Wolery 1983) and find that for a range of possible initial chemistries of Hadean seawater, the pH of issuing solutions at around 200 degrees C is around one or more units alkaline. Such pH values hold for interaction with both basaltic and komatiitic crust. The robustness of this result suggests to us that alkaline submarine springs of moderate temperature, carrying many hundreds of ppm HS to the ocean basins, are also serious contenders as sites for the origin of life, particularly as Hadean seawater was probably slightly acid, with a dissolved iron concentration approaching 100 ppm. On mixing of these solutions, supersaturation, especially of iron sulphide, would lead to the precipitation of colloidal gels. In our view iron sulphide was the likely substance of, or contributor to, the first vesicle membranes which led to life, as the supply organic molecules would have been limited in the Hadean. Such a membrane would have bid catalytic properties, expansivity, and would have maintained the natural chemiosmotic gradient, a consequence of the acid ocean and the alkaline interior to the vesicles.
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There was considerable local phosphate input from volcanos.
“Phosphate is more soluble at pH 6 than at pH 8 and was not likely to have been globally abundant in the early oceans [11,30], although there was surely considerable local phosphate input from volcanos [66,67].”
From Early bioenergetic evolution (2013) · cites this paper as [67]
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- Authors
- Macleod, G., McKeown, C., Hall, A. J., & Russell, M. J.
- Affiliations
- University of Glasgow (GB)
- ORCID
- Russell, Michael J.
- Venue
- Origins of life and evolution of the biosphere
- Published
- 1994-02
- Volume
- 24
- Issue
- 1
- Pages
- 19-41
- ISSN
- 0169-6149 (ISSN-L)
- 1573-0875
- OpenAlex
- W2065563967
- Cited by
- 206
- References
- 4
- Citations by year
- 2026: 4 · 2025: 8 · 2024: 6 · 2023: 11 · 2022: 7 · 2021: 11 · 2020: 6 · 2019: 7 · 2018: 13 · 2017: 10 · 2016: 12 · 2015: 7 · 2014: 6 · 2013: 11 · 2012: 8
- FWCI
- 3.93
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Origins of Life and Evolution of Biospheres (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- origin of life, submarine hydrothermal vents, alkaline pH, vesicle membrane, black smokers, basaltic crust, hydrothermal chemistry
- MeSH terms
- Origin of Life, Feasibility Studies, Ferrous Compounds, Geology, Hot Temperature, Hydrogen-Ion Concentration, Magnesium, Membranes, Minerals, Models, Chemical, Seawater, Software, Silicates, Proton-Motive Force, Evolution, Planetary, Geological Phenomena
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