Formation of Earth's Oldest Known Minerals
c. 4.4 Billion years ago · Prehistoric
Approximately 4.4 billion years ago, zircon crystals formed in what is now the Jack Hills region of Western Australia, creating the oldest known pieces of Earth's crust. These microscopic minerals, found in ancient sedimentary rocks, contain oxygen isotope ratios indicating they crystallized in cool conditions compatible with liquid water and oceans. This evidence contradicted earlier theories that early Earth was entirely molten and suggested habitable conditions existed during the Hadean Eon earlier than previously estimated, potentially affecting timelines for life's origin.
Key Figures
John Valley
Locations
Jack Hills
Topics
early EarthHadean Eonzirconastrobiology
Connected Events — 4 Connections
Smith's stratigraphic methods built frameworks for understanding deep geological time William Smith Publishes Geological Map of England
Cuvier's catastrophism attempted to explain the geological record extending back to Earth's earliest formations Cuvier Publishes Theory of Catastrophism
Earth formed from the same supernova-enriched proto-solar nebula, with the short-lived radioactive isotopes providing heat for early differentiation and the heavy elements enabling rocky planet formation Supernova Triggers Proto-Solar System Formation
Jack Hills zircon oxygen isotope ratios provide the primary evidence that liquid water existed on Earth's surface by 4.4 billion years ago Earth's Hadean Ocean Condenses from Volcanic Outgassing
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