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Geological Society, London, Special Publications; 1996; v. 100; p. 77-87;
DOI: 10.1144/GSL.SP.1996.100.01.07
© 1996 Geological Society of London

Outcrop, Mine and Borehole Studies

Deformation in the late Permian Boulby Halite (EZ3Na) in Teesside, NE England

Denys B. Smith

Geoperm, 79 Kenton Road, Newcastle upon Tyne, NE3 4NL, UK
Department of Geological Sciences, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, UK

Differential (mainly lateral) movement of up to a few hundred metres is interpreted from borehole data to have taken place in the late Permian Boulby Halite in Teesside, northeast England, probably when it was buried to a depth of 2000 m or more. This interpretation is based on a marked variation in the present thickness of the formation, which is thought to have been almost uniformly thick when formed, together with evidence from more than 20 borehole cores of contortion, fracturing, flow-lineation and flow-brecciation; evidence of bedding-plane slip was noted in one core. Inferred boudinage in the lower part of the formation is interpreted as evidence of local extension. Unusually for rock-salt, faults cut halite in eight of the cores, and voids in fractures and faults were noted in halite in six cores.