harzburgite," which at the time was utterly opaque. My understanding of the classification of ultramafic rocks, other than dunite, is still pretty muddy, but I grasped pretty quickly that "tectonized" is simply an adjective meaning that the rock has been sheared and crushed beyond recognition. So the fact that it was once a harzburgite is kind of beside the point; it mostly isn't anymore. Due to hydration/alteration of the Mg-rich minerals- olivine in particular- the rock as a whole can now be described as serpentinite. Finding samples in which the harzburgite is apparent is possible, but it requires purposeful effort. I have posted on this outcrop before, in a broader discussion of serpentine.
Photo unmodified. May 8, 2013. FlashEarth Location. Indexed
Is This Your Hat?
3 years ago