| P number: | P524301 |
|---|---|
| Caption: | Photomicrograph of peridotite. Light: PPL, Magnification x 2. North-north-west of Hallival, Rum, Invernessshire. |
| Description: | The image is a thin section of a peridotite rock from the island of Rum. It is dominated by black specks of opaque chromite and large clear crystals of olivine. British Geological Survey Petrology Collection sample number S 96998. Light: PPL, Magnification x 2. Light: PPL, Magnification x 2. Peridotites are ultramafic rocks, that is they contain no feldspar or quartz, and olivine is the dominant silicate mineral. The purest type of peridotite is termed an olivinite or dunite, consisting of almost pure olivine with accessory chromite and less than about 5% of other minerals. The term peridotite was defined by the geologist Rosenbusch in 1877. Rum is formed from one of the great Tertiary plutonic central intrusion complexes. It was emplaced in two stages. Stage 1 is the granophyre and microgranite of western Rum while Stage 2 is the Rum ultrabasic rocks which includes sixteen alternating layers of peridotite, gabbro and anorthosite (allivalite) in a layered sequence. The layered rock body was later invaded by transgressive intrusions of gabbro and eucrite mainly in the form of sheets. |
| Date taken: | 01/01/2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| X longitude/easting: | 138950 |
| Y latitude/northing: | 796800 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 281.82 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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