| P number: | P521374 |
|---|---|
| Caption: | Rock specimen of hornblende-biotite granite. Craignair Quarry, Dalbeattie, Kirkcudbrightshire, Scotland. |
| Description: | The sample is a pale-coloured grey granite dominated by plagioclase feldspar and quartz, with dark specks of biotite and amphibole. British Geological Survey Petrology Collection sample number EMC3682. The sample is from the Criffel-Dalbeattie Complex, the largest of the 'Galloway Granites' which includes the Loch Dee Complex and the Cairnsmore of Fleet massif. The Criffel-Dalbeattie intrusion is not technically a granite, comprising an early quartz diorite and a later adjacent granodiorite. These are characterized by plagioclase feldspar, biotite, amphibole, quartz and sphene. The granite, part of the Criffel Granite pluton is classed as one of the Newer Granites of the Caledonian Orogeny - a major period of mountain building that was caused by the closing of the ancient Iapetus Ocean driven by plate tectonics. Following the intense deformation and mountain building the Newer Granites were intruded in many places in Scotland. The Criffel granite has been quarried for monumental stone, building stone and aggregate. It is dated at 391 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: | EMC3682 |
| Orientation: | Landscape |
| Size: | 274.05 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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