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Breccia/Tuff Green-> Red

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Breccia/Tuff Green-> Red
Many of the rock layers are composed of a breccia of volcanic fragments from earlier parts of the volcano, held together with a matrix of altered ash. The ash is slightly green, reflecting the small divalent iron content. However, when a crack permits hydrothermal oxidation, some of the divalent iron becomes trivalent, and turns from greenish to reddish.


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Voted 10/10

And interesting - thanks for posting this!
Posted Jan 31, 2008 7:06 pm

MoapaPkRe: Cool!


Hasn't voted

Occasionally, it's nice to see examples of the stuff we've been taught!
Posted Jan 31, 2008 8:33 pm

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MoapaPkSubmitted by MoapaPk
on Jan 22, 2008 2:33 pm

Image ID: 374826
Hits: 3543 
Lat/Lon: 36.23755°N / 114.46554°W
Object Title: Breccia/Tuff Green-> Red

Image Type(s): Canyoneering