 Blue Schist
A cache by TeamNulti2003 Hidden: 1/6/2009
Size:  (Not chosen) Difficulty:  Terrain:  (1 is easiest, 5 is hardest)
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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 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.
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Blue Schist
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Current Time: 2/9/2010 10:37:12 PM (GMT-08:00) Pacific Time (US & Canada) (6:37 AM GMT)
Last Updated: 1/21/2010 7:12:25 AM (GMT-08:00) Pacific Time (US & Canada) (3:12 PM GMT)
Rendered: From Database
Coordinates are in the WGS84 datum
