BRP 300.6 Green Mountain Overlook EarthCache

This cache has been archived.

rainbowtree: DO NOT post a log to this cache, even backdated. Your log will be immediately deleted.
Gifting location and content to a special cacher.

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Hidden : 6/1/2017
Difficulty:
1.5 out of 5
Terrain:
1.5 out of 5

Size: Size: other (other)

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Geocache Description:

BLUE RIDGE PARKWAY OVERLOOKS GEOLOGY TOUR
There are countless wonders to behold along your journey.
Posted coordinates are for parking. - Outcrops are within 100 feet.

EARTHCACHE REQUIREMENTS
Each cacher must send his/her own answers BEFORE logging a find. Enjoy the journey (learning adventure) as well as the destination (smiley earned). Remember to take only pictures and leave only footprints. To get credit for this Earthcache, complete the following tasks:

1. MESSAGE …. What are index minerals?

2. MESSAGE …. Based on the amount of chlorite present, how much of this outrop has begun metamorphism?

3. LOG …. Post a picture at or near the coordinates. This picture is your log signature.

OPTIONAL - Please respect the time and effort involved in finding and creating this earthcache by adding A and B to your log.

A. JOURNEY OF THE MIND ... Science explains what we observe. Relate (in your own words) something you found interesting in the reading. This adds to your learning adventure and your log.

B. JOURNEY OF THE HEART ... Art shares our personal experience of what we see. Share something special you found on site, and why it is special to you. This is a memorable addition to your log and will make other hearts smile.

THANK YOU Mark W. Carter for permission to use your book for this earthcache.
THANK YOU Lillian for permission to place this earthcache along the Blue Ridge Parkway.


REGIONAL BARROVIAN METAMORPHISM


Index minerals are so called because they index when, during the metamorphic processes, a particular set of temperature and pressure conditions have been achieved, and they appear in a set order: chlorite, biotite, garnet, staurolite, kyanite, and sillimanite.

At low temperatures and pressures, chlorite is the only index metamorphic mineral that appears in the rock. As temperature and pressure increase, other minerals appear. The chlorite tells us that metamorphism has begun at this point.



OUTCROP

The outcrop of metagraywacke across the Parkway to the west has a greenish color caused by the minerals chlorite and sericite within the rock. These minerals formed when the rocks of the area underwent metamorphism.

RESOURCES
A Geologic Adventure Along The Blue Ridge Parkway in North Carolina by Carter/Merschat/Wilson ... 2001
Pic of metagraywacke ... https://budcline.aminus3.com/image/2012-03-02.html

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