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the claim
Earth's groundwater dates back millions of years
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
3 sources for · 0 against

Multiple scientific studies utilizing isotopic dating and noble gas tracers confirm that deep groundwater in Earth's crust can date back millions, or even billions, of years.

Evidence for · 3
Using 81Kr and noble gases to characterize and date groundwater and brines in the Baltic Artesian Basin on the one-million-year timescale
2017 · cited by 69
Using 81Kr and noble gases, this study dated groundwater and brines in the Baltic Artesian Basin to over a million years old.
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The analysis

The claim states that Earth's groundwater dates back millions of years. Papers [1], [5], and [6] provide direct empirical evidence showing that deep groundwaters and fracture fluids in various basins have residence times ranging from millions to billions of years, supporting the claim entirely with no conflicting evidence.

More for · 2
South African crustal fracture fluids preserve paleometeoric water signatures for up to tens of millions of years
2018 · cited by 26
This study found fracture fluids in South Africa with residence times up to tens of millions of years, representing some of the oldest paleometeoric waters recorded.
86Kr excess and other noble gases identify a billion-year-old radiogenically-enriched groundwater system
2022 · cited by 21
Noble gas-derived residence times confirmed deep groundwaters in Earth's crust preserved on timescales exceeding a billion years.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 8604 Aug 2026
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