| P number: | P521262 |
|---|---|
| Caption: | Rock specimen of banded gneiss. North-east of Loch na Beiste Brice, Badcall, Sutherland, Scotland. |
| Description: | The rock consists of interbanded layers of pale quartz and feldspar and darker greenish-grey bands containing biotite mica or amphibole. British Geological Survey Petrology Collection sample number EMC200. The term granulitization is an old geological term used to describe the physical reduction or destruction of the components of a rock such as a gneiss as a result of deformation during regional metamorphism. Today this process is known as mylonitisation, and the product is termed mylonite. The Lewisian Complex (Precambrian) is a fragment of the ancient Laurentian continental mass showing the evidence of repeated metamorphism and deformation deep within the earth's crust over a period of 1800 Ma. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC200 |
| Orientation: | Landscape |
| Size: | 255.19 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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