Blue Schist EarthCache
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Blue Schist
At this location on Mt. Diablo you will see an example of Blue Schist. This blue schist is an unusual type of metamorphic rock that forms in high-pressure, low-temperature environments, such as plate subduction zones, where one of the earth's tectonic plates slides under another.
Blue schist is named for the noticeable blue color of the mineral glaucophane.
Blue schist is usually derived from basalt or graywacke sandstone that has been dragged down 20-30 miles, squeezed, and then faulted back up to the surface before it's had time to heat up. This process happens very slowly, over many millions of years. To geologists, blue schist is a "red flag" indicator of an earthquake fault or subduction zone.
To log this cache, you will need to complete the following:
- Email the cache owner the (a) Texture of the Blue Schist and (b) Estimate the Size of the Blue Schist.
- Post a picture of You and your GPS along with the Blue Schist.
Find more Earthcaches
If you would like to see a larger example of Blue Schist, feel free to go to - N 37° 52.073 W 121° 56.455
Additional Hints
(No hints available.)