X Marks the Scot - An on-line community of kilt wearers.
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9th January 07, 10:16 AM
#11
hmm.. I wonder how hard it would be to get some Scottish Granite for my kitchen...hmmm...
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10th January 07, 08:12 AM
#12
Granites are gneiss but metamorphic rocks are cooler
To me, the metamorphic geology in Scotland is the more interesting geology.
Check out this link:
http://www.brocku.ca/earthsciences/p...gy/barrow1.htm
Here's a blurb from the 1st page of the link...
George Barrow mapped a widespread series of zones of progressive metamorphism, as observed in the Dalradian sequence exposed in Scottish Highlands, in the late 19th century.
Each zone recognized is based on the first appearance of a group of distinctive index minerals as the highest metamorphic grade, along the thermal axis, was approached. Thermal axis has abundant granitic bodies situated along its length.
Index mineral is one which is characteristic of that zone - any mineral within the zone may be the index mineral.
So what this means....as one stand on the rocks and moves from places to place and notices different minerals present. The presence and absence of these index minerals infer temperatures and pressures that the package of rocks were at within the crust during an orogoney (mountain building). The really thing about the Scottiah Highlands is one can walk through a progressive series (different temperatures and pressures) via the visible index minerals and see how the same lithology (package of rock) changed with T & P.
I love metamorphic geology but groundwater pays the bills
Cheers,
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12th January 07, 02:05 PM
#13
Most of Scotland is not granite, but volcanic and sedimentary in nature. The cairngorms are granite, but other areas are not. I would refer interested folks to two sources:
1. A Crack in the Edge of the World: America and the Great California Earthquake of 1906 (P.S.) by Simon Winchester. It has an excellent discussion about the North American plate and plate tectonics in general, including some remarkable facts about the relationship between Scotland and Montana (now I have made you curious).
2. The usual: Wikipedia http://en.wikipedia.org/wiki/Geology_of_Scotland
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