| P number: | P220844 |
|---|---|
| Old photograph number: | D04975 |
| Caption: | Migmatitic rock, Laggan Bridge, Invernessshire. |
| Description: | Migmatitic rock at Laggan Bridge. The rock shows coarse quartzo-feldspathic segregations in psammitic and semipelitic gneiss. A migmatite or injection gneiss is a 'mixed' rock made up of a pre-existing host rock, usually a metamorphic rock and invading granitic material which may be a magma, hydrothermal solutions or a rather indefinite diffusion of material called emanations throughout the host rock. Large areas of migmatites occur in the northern part of the Grampian Highlands and are termed the Central Highlands Migmatite Complex. They are composed of coarse-grained psammites, quartzites and semipelitic gneisses at upper amphibolite metamorphic grade. They are frequently migmatitic with granitic (quartz-alkali feldspar) leucosomes in the psammitic rocks and trondhjemitic (quartz-plagioclase) in the semi-pelites. |
| Date taken: | Wed Jan 01 00:00:00 GMT 1992 |
| Photographer: | McTaggart, F.I. |
| Copyright statement: | NERC |
| X longitude/easting: | 261650 |
| Y latitude/northing: | 795450 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Portrait |
| Size: | 662.60 KB; 781 x 1000 pixels; 66 x 85 mm (print at 300 DPI); 207 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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