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Oldest evidence of Earth’s magnetic field
May 5 , 2024
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- Geologists have found ancient rocks in Greenland that bear the oldest remnants of Earth’s early magnetic field.
- The researchers determined that the rocks are about 3.7 billion years old and retain signatures of a magnetic field with a strength of at least 15 micro teslas.
- The ancient field is similar in magnitude to the Earth’s magnetic field today.
- Previous studies have shown evidence for a magnetic field on Earth that is at least 3.5 billion years old.
- The new study is extending the magnetic field’s lifetime by another 200 million years.
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