Abstract

The Hebridean Province of NW Scotland provides insight into the interaction between active tectonics and the development of shallow marine deltaic, estuarine and tidal strait depositional successions in the Sea of the Hebrides and Inner Hebrides Basins. Syn-depositional block tilting impacted the gross thickness, sand to mud ratio and the distribution of shallow-marine facies in the resulting succession. New Middle Jurassic palaeogeographic maps and stratigraphic correlations are presented that integrate both outcrop and well data and illustrate the deltaic sedimentary system in a broad, semi-regional context.

Results show that distance from the Scottish hinterland and the syn-rift tectonic geomorphology are the critical controls on the thickness, sand to mud ratio and facies types. The impact of relative sea level change is hard to detect in proximal locations or where sediment flux was large relative to accommodation, but becomes more influential in distal locations where eustasy and tectonism interacted across tilted fault blocks to increase the influence of accommodation over sediment supply.

Supplementary material:https://doi.org/10.6084/m9.figshare.c.4397858

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