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American Focus > Blog > Tech and Science > These rocks are probably the last remains of Earth’s early crust
Tech and Science

These rocks are probably the last remains of Earth’s early crust

Last updated: June 27, 2025 2:25 am
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These rocks are probably the last remains of Earth’s early crust
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The Nuvvuagittuq Greenstone Belt in Canada may contain the world’s oldest rocks

Jonathan O’Neil

Approximately 4 billion years ago, a significant event occurred on Earth as magma from the planet’s mantle seeped into a fracture within its nascent crust. This geological phenomenon led to the formation of a unique rock formation known as the Nuvvuagittuq Greenstone Belt, located on the shores of Hudson Bay in Canada. This particular rock sample holds the potential to provide insights into Earth’s ancient history, with some researchers suggesting it could be the oldest rock in the world.

The debate surrounding the age of the Nuvvuagittuq Greenstone Belt dates back to a study conducted in 2008 by Jonathan O’Neil from the University of Ottawa. The initial estimation of the rock’s age at 4.3 billion years placed it within the Hadean Aeon, making it a crucial piece in understanding the planet’s early development.

Unlike traditional dating methods using minerals like zircon, the age of these rocks was determined by analyzing the isotopes of neodymium and samarium present in the rock. This unconventional approach sparked controversy within the scientific community, with some experts questioning the validity of the rock’s Hadean origin.

Recent research by O’Neil and his team delved deeper into the surrounding rocks, providing further evidence to support the theory that the Nuvvuagittuq Greenstone Belt is indeed over 4 billion years old. By analyzing the intrusion within the rock formation, a consistent age of approximately 4.16 billion years was determined, reinforcing the belief that this formation is a relic from Earth’s ancient past.

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Experts like Graham Pearson from the University of Alberta acknowledge the compelling case made by O’Neil and his team, suggesting that these rocks could be the oldest on the planet. However, the quest to unravel Earth’s early history continues, with ongoing research and debates shaping our understanding of the planet’s geological evolution.

A detailed view of the Nuvvuagittuq Greenstone Belt in Canada

David Hutt / Alamy

TAGGED:CrustearlyEarthsremainsRocks
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