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3 Billion Year Old Crater Found in Australia
24 Jun
Summary
- An ancient impact crater, dating back three billion years, has been identified in Australia.
- The crater is older than the previously recognized oldest impact site on Earth.
- Researchers used zircon and apatite dating to confirm the crater's age.
A meteorite impact three billion years ago created what is now recognized as Earth's oldest known impact crater, located in Australia's Pilbara region. This ancient event occurred during the Archean eon, a period of early continental formation and the emergence of life. Researchers from Curtin University employed advanced techniques, analyzing the recrystallized zircon crystals and apatite minerals within the North Pole Dome crater.
These geological samples, exhibiting unique crystalline structures akin to those found on the moon, provided a precise age of approximately three billion years. This discovery surpasses the previously identified Yarrabubba crater, which dates to 2.2 billion years ago. The study, published in Geology journal, highlights the significance of well-preserved geological sites as archives of Earth's history, offering insights into early planetary processes.
At the time of the impact, Earth was a vastly different planet, characterized as a water world with a dimmer sun and a closer moon, supporting early life forms like stromatolites. The ongoing research underscores the challenges and triumphs of identifying ancient impact evidence on Earth, which is often erased by geological processes like erosion and plate tectonics. The combination of zircon and apatite dating is described as the 'smoking gun' confirming the impact event's age.
