| P number: | P521287 |
|---|---|
| Caption: | Rock specimen of granite. Hill of Bennachie, Inverurie, Aberdeenshire, Scotland. |
| Description: | The photograph is a detail of a polished surface of granite. It shows the typical intergrown granular nature of granite, comprising a mixture mainly of quartz (pale-greenish-grey), feldspar (pink) and biotite mica (black). British Geological Survey Petrology Collection sample number EMC1405. Larger areas of pink in the sample represent large crystals of feldspar known as phenocrysts. The Bennachie Granite is part of the Cairngorm suite of Caledonian granites. It is bounded to the east and west by faults. Other contacts are steep, but some veining of the country rock can be seen in the south-west. The pluton comprises a coarse- to very coarse-grained (5-10 mm), variably porphyritic granite; a separate porphyritic microgranite phase occurs in the western part. The pluton is traversed by north-trending veins of reddened, brecciated and silicified aplite, the largest of which is coincident with the eastern contact. It has been dated at c. 400 Ma (Devonian in age). |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC1405 |
| Orientation: | Landscape |
| Size: | 271.89 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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