See also...


Authorizations, license

Visible by: Everyone
All rights reserved

61 visits

Deep in the Earth's crust, Parry Sound, ON

Deep in the Earth's crust, Parry Sound, ON
These rocks were flattened when two slices of earth's crust slid one on top of the other at about 30 km depth, about 1,120 million years ago.

sfgl545, tiabunna have particularly liked this photo


Comments
the longhairbroad
the longhairbroad
Is this shale?
4 years ago.
David Corrigan
David Corrigan
No, but it really looks like it! This started out as a type of granite (the grey bands), perhaps cut by a vein of black rock (basaltic), and originally had very little fabric. Then it ended up being completely flattened by tectonic plates moving by each other... a bit like when you make pie crust with a roller pin. Start with a lump of dough and end up with something flat and flaky. At that depth the temperature is about 800 degrees celcius and rocks behave like plasticene.
4 years ago.
the longhairbroad
the longhairbroad
So...metamorphic, right?
4 years ago.
tiabunna
tiabunna
Wow, a fascinating description. There can't be too many places where that kind of structure is visible. I'll have to poke around your shots further for the geology lesson. :)
4 years ago.