| P number: | P521381 |
|---|---|
| Caption: | Rock specimen of quartz dolerite. Near Airdrie, Lanarkshire, Scotland. |
| Description: | The sample is a dark basic igneous rock with a medium to fine-grained texture, containing visible pale laths of plagioclase feldspar. British Geological Survey Petrology Collection sample number EMC2988. A dolerite is a medium-grained equivalent of a gabbro (coarse-grained) or a basalt (fine-grained), in that it is an igneous rock of basic composition. Dolerites mainly occur as dykes, sills or plugs, and commonly occur in swarms associated with a volcanic neck. In terms of chemical composition and mineral content dolerites, gabbros and basalts are identical. Quartz-dolerite has been intruded into the Carboniferous strata of Falkirk district both as sills and dykes, predominantly east-west to locally ENE trending. They form part of a major suite of high-level tholeiitic intrusions extending throughout Scotland and into the North Sea. Radiometric ages indicate an age of 302-297 Ma in age, late Carboniferous. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC2988 |
| Orientation: | Landscape |
| Size: | 264.55 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: | Unsorted Images |
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