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Uploaded on:
12/03/2009 11:10:00
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P number: P524323
Caption: Photomicrograph of gabbro (hyperite). Light: XPL, Magnification x 10. Arran, Buteshire.
Description: The image is a photomicrograph of a thin section of gabbro, taken under crossed-polarized light in order to show the interference colours of the constituent minerals. British Geological Survey Petrology Collection sample number ED 895. Light: XPL, Magnification x 10. Light: XPL, Magnification x 10. The large elongate plagioclase crystals show characteristic grey interference colours and distinctive lamellar twinning. The brighter coloured crystals are pyroxene. The rock is Tertiary in age and would have come from the Central Igneous Complex on Arran. The complex represents a large caldera with a number of volcanic cones, possibly three. Beneath the caldera the plutonic rocks were emplaced, the granites and the gabbros. It is thought that the latter were emplaced more or less in conformity with the caldera margins and contemporaneously as there was development of magma mixing to give a range of hybrid rocks.
Date taken: 01/01/2003
Photographer: Hyslop, E.K.
Copyright statement: NERC
Orientation: Landscape
Size: 288.52 KB; 1000 x 672 pixels; 85 x 57 mm (print at 300 DPI); 265 x 178 mm (screen at 96 DPI);
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