Olivine hawaiite - Isle of Rum
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Fact sheet
Description: 

This sample of hawaiite lava comes from the Orval Member of the Canna Lava Formation. The Orval Member is the uppermost series of this incomplete sequence of Palaeocene lavas which record the lastĀ major eruptive events on the Isle of Rum. The lavas and associated sediments are outliers, interpreted as havingĀ accumulated in a succession of hills and evolving valleys, post-dating the Western Granophyre and thus the central complex on Rum. These lavas are one of the best examples of the rapid erosion and exposure of volcanic plugs in the North Atlantic Igneous Province. The Orval Member includes olivine- and feldspar-phyric hawaiites and basaltic hawaiites.

The thin section exhibits relatively equal sized olivine and pyroxene grains some cldeavage evident in the pinkish-grey pyroxenes. Opaque minerals are common, and randomly oriented plagioclase laths and altered glass complete the section.

In Place
In Time
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Location description: 
Somewhere on the Isle of Rum
Accuracy:
Location precision: 
Poor
Timescale:
Timescale: 
Paleogene
Ma = Millions of years ago
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Type: 
igneous
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