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Geological Society, London, Special Publications; 1990; v. 49; p. 673-696;
DOI: 10.1144/GSL.SP.1992.049.01.41
© 1990 Geological Society of London

Geology and Tectonics of South Oman

The Batain Melange of NE Oman

R. M. Shackleton1, A. C. Ries2, P. R. Bird3, J. B. Filbrandt4, C. W. Lee5 & G. C. Cunningham6

1 The Croft Barn, Church Street, East Hendred, Oxon OX12 8LA, UK
2 Earth Sciences and Resources Institute, University of Reading, 19 Upper Redlands Road, Reading RG1 5JJ, UK
3 Scott Pickford & Associates Ltd., 256 High Street, Croydon, Surrey CRO 1NF, UK
4 Shell U.K. Exploration & Production, Shell-Mex House, The Strand, London WC25 0DX, UK
5 Department of Science, Polytechnic of Wales, Treforest, S Wales, UK
6 Department of Geology, Royal Holloway & Bedford New College, Egham, Surrey TW20 0EX, UK

Most of the Batain coast area, previously unmapped or mapped as Hawasina, is shown to be underlain by melange. This consists of blocks, up to 10 km long, of a variety of rocks in a scanty, seldom exposed sheared shaly matrix. Clasts include Triassic and younger Hawasina-type red cherts and shales; Mesozoic calciturbidites; Permian limestones and megabreccias (associated with basalts); ammonitico rosso type blocks (Triassic?); a limestone and pillow lava assemblage, probably Jurassic; Cretaceous ophiolite; and Upper Cretaceous sandstones with basement-derived debris flows. Deformation becomes increasingly complex northwards. WNW-vergent thrusts and folds, dominant in the south, appear to have been continuous with the south-vergent structures in the Hawasina, west of the Jebel Ja’alan basement uplift. The melange is interpreted as primarily tectonic but probably composite in origin. It is correlated with the Hawasina (Oman) Melange which underlies the Semail Ophiolite, west of the Jebel Ja’alan Uplift. It is compared with other Tethyan melanges.





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