| P number: | P524304 |
|---|---|
| Caption: | Photomicrograph of beerbachite. Light: PPL, Magnification x 10. Glen Harris, Rum, Invernessshire. |
| Description: | The image is a photomicrograph of a thin section, showing a mixture of essentially two mineral types. Abundant small grains of high-relief pale or slightly yellow minerals of probable pyroxene occur within a groundmass of light plagioclase feldspar and small black opaque oxides. British Geological Survey Petrology Collection sample number S 97004. Light: PPL, Magnification x 10. Light: PPL, Magnification x 10. A beerbachite is an igneous rock related to a gabbro, but which is very fine-grained. It is classified along with aplites, which are fine-grained rocks often containing concentrations of accessory minerals and are enriched in rare elements. They occur generally as veins or dykes and have a characteristic sugary texture. Rum is a major central complex of the British Tertiary Volcanic province. Other central complexes in the Inner Hebrides include Skye, Ardnamurchan, Mull and Arran. The sequence of intrusion began with breccias, the result of volcanic explosion, followed by plateau lavas of which very few remain. The major granophyre and microgranite plutonic intrusions of eastern Rum were intruded followed by the famous Rum layered ultrabasic complex. A set of radial basic dykes and a small number of basic cone sheets the centre of which is the head of Glen Harris completed the igneous activity. |
| Date taken: | 01/01/2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| X longitude/easting: | 137480 |
| Y latitude/northing: | 796420 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 297.63 KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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