Study Dates North Pole Dome at 3.024 Billion Years, Confirming Earth's Oldest Impact Structure
Updated
Updated · The Conversation · Jun 23
Study Dates North Pole Dome at 3.024 Billion Years, Confirming Earth's Oldest Impact Structure
3 articles · Updated · The Conversation · Jun 23
Summary
North Pole Dome in Western Australia has been dated to 3.024 billion years ago, making it the oldest known impact structure on Earth and the only recognized Archean crater.
Two mineral dating methods drove the finding: skeletal zircons and apatite in shocked rocks both pointed to the same impact age, strengthening the case beyond earlier rock-layer correlations.
The result resolves a long-running age dispute after a later study had argued the impact might be far younger—anywhere from 2.7 billion to 400 million years old.
shatter cones in the Pilbara rocks had already shown a meteorite strike, but the new dates pin that event to Earth's early history, when most surface scars have since been erased by tectonics and erosion.
Earth's oldest crater is now dated, but why do some scientists still argue it wasn't caused by a meteorite?
If an 800-million-year gap in Earth's impact record just closed, how many more ancient craters are still hidden?
Could this 3-billion-year-old crater reveal how violent cosmic impacts helped spark the first life on our planet?
The Miralga Impact Structure: Unraveling the Age and Significance of Earth’s Oldest Suspected Crater (3.0–3.5 Billion Years)
Overview
The Miralga impact structure, set in Western Australia's North Pole Dome, is at the center of a major scientific debate about early Earth. Scientists discovered shatter cones—distinctive rock features formed only by powerful asteroid impacts—within a thick sedimentary layer, providing strong evidence of a massive ancient collision. If confirmed as the oldest known impact crater, Miralga could reshape our understanding of how early Earth evolved. This claim is significant because it links the crater’s age and unique geology to the conditions that may have influenced the planet’s earliest history and the emergence of life.