Diorite – Loch Doon
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Fact sheet
Description: 

The diorite at Loch Dee is located at the southern end of the Loch Doon pluton, which is one of the finest examples in Scotland of a zoned pluton showing inwards progression from a dioritic margin to an acidic interior. The Loch Doon pluton is one of the Later Caledonian intrusions in southern Scotland intruded around 408 million years ago during the Devonian period.

In thin section this diorite contains laths of plagioclase feldspar often 2-3 millimetres long, and minor amounts of quartz. The mafic minerals are dominated by high relief pyroxene with it's characteristic cleavage, and common biotite which exhibits some pleochroic haloes caused by zircon inclusions.

In Place
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infoImage: 
Location description: 
Loch Dee at the southern margin of the Loch Doon pluton
Accuracy:
Location precision: 
Good
Timescale:
Timescale: 
Devonian
Ma = Millions of years ago
In Focus
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Type: 
igneous
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