Discovery of 2 Billion-Year-Old Primordial Water in Canada Offers Insight into Ancient Microbial Life
Scientists have reported the discovery of primordial water believed to be among the oldest on Earth, preserved deep beneath the planet’s surface for billions of years. This discovery provides important clues about the planet’s early conditions and the potential existence of ancient microbial life.
The water was found at the Kidd Creek underground mine in Ontario, Canada, at a depth of approximately 2.4 kilometres. This location lies within the Canadian Shield, a geological formation of exceptionally ancient rock. Research published in the journals Nature and Geochemical Perspectives Letters indicates the water’s age is estimated at between 1.5 and 2.6 billion years.
A research team led by a geochemist from the University of Toronto and supported by researchers from Princeton University analysed the isotopic composition of dissolved gases in the water sample, including helium, neon, argon, and xenon. The exceptionally high concentration of noble gases indicates that the water has been isolated from Earth’s surface for an extremely long geological timespan.
Beyond its extreme age, the primordial water also contains hydrogen and methane in significant concentrations. These compounds formed through chemical reactions between water and iron-rich rock, a process known as radiolysis. This reaction generates chemical energy that could potentially support microbial life without dependence on sunlight.
According to a report from the Natural Sciences and Engineering Research Council of Canada, this discovery strengthens the hypothesis that microbial life can survive far beneath Earth’s surface in extreme environments. Previous microbiological studies at similar locations have identified the presence of microorganism communities that utilise chemical energy from rock and water.
This discovery has broad implications for astrobiology. Researchers consider that hydrogen-rich subsurface environments such as those at Kidd Creek could serve as analogues for conditions beneath the surface of Mars or ice moons such as Europa and Enceladus. If life can survive at Earth’s depths without sunlight for billions of years, similar possibilities could occur on other planets or moons.
Geologically, the water originates from the Archean to early Proterozoic period, an era when Earth’s atmosphere was not yet oxygen-rich and life was still dominated by simple microscopic organisms. Thus, this primordial water serves as a natural time capsule preserving traces of early Earth’s chemical conditions.
This discovery not only expands our understanding of the planet’s hydrological history but also opens new perspectives regarding the resilience of life in extreme environments.