Tuesday, August 5, 2014

Geo 730: August 5, Day 582: Alteration Zone

The calcite vein is out of sight on the left, behind the alder growing in the ditch, but you can see how the nearby rock in the cut is a light, ashy gray, which slowly grades to black and basalt-like in the distance. This is the gradient from highly altered (nearby) to basically unaltered (distance) rocks. Also, in the foreground, you can see what looks to be crude layering, dipping maybe 25 degrees to the left.

Photo unaltered. June 19, 2014. FlashEarth location.

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