Wednesday, December 8, 2010

Slick-n-slide

P1200571

Ok, so the technical name for this is “slickenside,” but I find “slickenslide” easier to remember.

(I loved the concept of slip n’ slides as a child.)

Anyway, a slickenside is created as the two sections of rock alongside a fault move past each other, slowly polishing the surfaces of the rock. This creates smooth, slick rock faces along a fault line. Sometimes you can find “slickenlines” on the slickenside, which are small, directional scrap marks left by the movement.

In the above picture, the slickenside (and fault) cross at about 35 degrees from the left to the right. In the below picture, the slickenside is more difficult to see, but is at about 60 degrees.

P1200612

That, it should be noted, is the definition of slickenside that I learned on a field trip – if anyone has a more technical definition, I would be really interested to hear it!

3 comments:

Gaelyn said...

And here I thought we were going to play in the water somewhere warm.

Christoph said...

Here's some from Greece in a quite bigger scale:
http://sphotos.ak.fbcdn.net/hphotos-ak-ash2/hs614.ash2/156692_145717408810144_139495536098998_240073_1220856_n.jpg

Arkitsa fault scarp in Greece, but okay, it has been excavated due to road construction works...

Cheers,

Christoph

helena.heliotrope said...

@Christoph Wow! Even with the road construction, that's pretty incredible. Thanks for posting that!

@Gaelyn Oh, I wish :)