The Dawn of Plate Tectonics

by |March 14, 2014
Image: Dr. Mark Reagan, Science Now

Image: Dr. Mark Reagan, Science Now

An ancient grain of zircon found

In Jack Hill sandstone north of Perth,

Inside its crystal lattice bound:

Secrets of our planet’s birth.

 

The oldest grain (we rock hounds swoon),

Tells of magma oceans past,

An early impact yields the moon;

And all of this occurred so fast!

 

The zircon’s old, which then implies

That solid rocks must be still older.

In Canada, a sequence lies,

With implications even bolder!

 

A pattern locked within old lava

Echoes patterns from the deep;

Mariana-like subduction …

To plate tectonics, take the leap!

 

Hadean times are cloaked in intrigue,

Eons distant, full of strife,

Yet it seems these rocks held promise,

Full of boron, primed for life!

 

_______________________________________________

In the news:

New Record for Oldest Earth Rock, Sky and Telescope

Hadean age for a post-magma-ocean zircon confirmed by atom-probe tomography, Nature Geoscience

The Dawn of Plate Tectonics, Science Now

Heading down early on? Start of subduction on Earth, Geology


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