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Geological Society, London, Special Publications; 1992; v. 62; p. 97-110;
DOI: 10.1144/GSL.SP.1992.062.01.10
© 1992 Geological Society of London

The Hebridean Basins and Adjacent Areas

Dynamic stratigraphy of the Triassic and Jurassic of the Hebrides Basin, NW Scotland

Nicol Morton

Department of Geology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK

The evolution of the Hebrides Basin during the late Triassic and Jurassic has been established by integrating analyses of subsidence history, sequence stratigraphy and stratigraphical architecture. Two episodes of three-phase evolution occurred from extension-related variable sequences (1A, late Triassic to early Sinemurian; 2A, latest Toarcian to late Bajocian), through sag-related laterally more uniform sequences (1B, mid-Sinemurian to earliest Toarcian; 2B, late Bajocian to late Bathonian), to stabilization—related condensed sequences (1C, Toarcian; 2C, late Bathonian to Callovian). A final third episode of subsidence in Oxfordian to early Kimmeridgian was followed by partial basin inversion in latest Jurasic or early Cretaceous, which caused faulting, tilting and uplift of basement ridges. These structures are unconformably overlain by Upper Cretaceous sediments and Palaeocene volcanics.

There was a single Hebrides Basin during the late Triassic and Jurassic subsiding as a half-graben bounded on the west by the Minch Fault. The intrabasinal Camasunary and related faults are demonstrated not to have been significant tectonic features during the Jurassic. Occasionally they were slightly active but they did not divide the area into two sub-basins. They are largely post-Jurassic. There is evidence of a less strongly subsiding central Skye block, apparently in the area of the later Palaeocene plutonic centre.





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