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P000774

P number: P000774
Old photograph number: D02219
Caption: Isle of Rum, Askival, Hallival. Inverness-shire. Layered peridotitic and gabbroic igneous rocks of the Rum Central Complex of Tertiary age give rise to a strongly terraced topography due to contrasting weathering.
Description: Isle of Rum, Askival, Hallival. Inverness-shire. Layered peridotitic and gabbroic igneous rocks of the Rum Central Complex of Tertiary age give rise to a strongly terraced topography due to contrasting weathering. Askival is part of the Eastern Layered Intrusion, it is a classic area of igneous layering. It consists of a succession of thick layers of bytownite-troctolite and feldspathic peridotite. The layered rocks are divided into 16 major units, each grades upwards from olivine-rich to feldspar-rich rocks. The cause of the layering is still being debated, the classical view is of crystal settling in the semi-molten mush of magma. Recent views advocate a mechanism involving in situ crystallization and double-diffusive convection.
Date taken: Sat Jan 01 00:00:00 GMT 1977
Photographer: Christie, A.
Copyright statement: NERC
Acknowledgment: This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network
X longitude/easting: 140500
Y latitude/northing: 795500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 435.02KB; 1000 x 994 pixels; 85 x 84 mm (print at 300 DPI); 265 x 263 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Best of BGS Images/ Landscapes  

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