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Geological Society, London, Special Publications; 1987; v. 27; p. 175-183;
DOI: 10.1144/GSL.SP.1987.027.01.15
© 1987 Geological Society of London

The Outer Hebrides Fault Zone: evidence for normal movements

S. H. White & J. Glasser

Geology Department, Royal School of Mines, Imperial College of Science and Technology, Prince Consort Road, London SW7 2BP, UK

The Outer Hebrides Fault Zone is a major structural feature within the Lewisian of the Outer Hebrides. It is well exposed in the Uists where it consists of high-strain strands of ultracataclasite, cataclasite and phyllonite in a crush melange. Microstructural studies of the fault rocks indicate that the sequence crush melange-cataclasite-phyllonite is typical of that for c-type mylonite development and reflects increasing retrogression. This, plus the anastomosing pattern of the high-strain zones, suggests that the fault rocks in the Uists mark the edge of a major fault zone. Fold and shear band asymmetries indicate a major phase of normal movement. It is not possible to assign definite ages to either, but it is clear that the formation of the crush melange preceded that of the high-strain strands, which appear to be immediately post-Caledonian.





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H. Fossen, T. Odinsen, R. B. Faerseth, and R. H. Gabrielsen
Detachments and low-angle faults in the northern North Sea rift system
Geological Society, London, Special Publications, 2000; 167: 105 - 131.
[Abstract] [PDF]