| P number: | P524373 |
|---|---|
| Caption: | Photomicrograph of Dunsapie basalt. Light: PPL, Magnification x 2. Arthur's Seat, Edinburgh, Lothian Region. |
| Description: | The image is a photomicrograph showing part of a thin section of basalt from Arthur's Seat in Edinburgh. The rock is composed of large crystals of pyroxene and olivine within a fine-grained groundmass consisting largely of tiny laths of plagioclase feldspar. British Geological Survey Petrology Collection sample number S 12562. Light: PPL, Magnification x 2. Light: PPL, Magnification x 2. Arthur's Seat is an ancient volcano situated in the city of Edinburgh. It contains a series of volcanic vent intrusions surrounded by vent agglomerates, basaltic lavas and tuffs, which are intruded by basic sills and dykes. Widespead igneous activity occurred in the Carboniferous of the Midland Valley. Great thicknesses of plateau basalt lavas were formed. The basalts are almost always porphyritic enabling a classification based upon the size and occurrence of plagioclase, clinopyroxene and olivine phenocrysts. Names are based on type localities in central and southern Scotland. Dunsapie-type basalts have phenocrysts greater than 2mm of plagioclase, olivine and clinopyroxene. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 340.34 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: | Best of BGS Images/ Rocks and minerals under the microscope |
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