| P number: | P521422 |
|---|---|
| Caption: | Rock specimen of dolerite. Quarry, near Avonbridge, Slammanan, Linlithgowshire, Scotland. |
| Description: | The sample is a uniform dark basic igneous rock, typical of a dolerite. It has a medium grain size with few minerals visible to the naked eye, and is best investigated using a microscope. British Geological Survey Petrology Collection sample number EMC2805. Dolerites are very common throughout the world, mainly occurring as intrusive dykes or sills. They tend to occur together in dyke swarms or sill complexes, often associated with volcanic activity. The term dolerite is mainly a British name for what many geologists would call a microgabbro. In America the term diabase is often preferred, although traditionally in Britain a diabase is an altered dolerite in which few, if any, of the original minerals have survived. 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: | EMC2805 |
| Orientation: | Landscape |
| Size: | 248.73 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 |
Loading...
Loading...
Reviews
There is currently no feedback