| Rare earth (55) |  |
| Zircon (3) | |
| Rare earth (55) | |
| Zircon (3) | |
A new analysis of zircon minerals suggests that the field originated at least 4. 2 billion years ago a hop after the planet formed in the geological timeline,
For this new estimate, Tarduno and his team looked at tiny zircon gemstones in Western australia that date back to the earliest two eons in the planet's history the Archean and Hadean periods.
A substance called magnetite that lies within the zircon crystals contains information about the magnetic field record at the time the minerals cooled from their molten state a process that took over a billion years.
< Back - Next >
Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011