Source‐to‐sink mass‐balance analysis of an ancient wave‐influenced sediment routing system: Middle Jurassic Brent Delta, Northern North Sea, offshore UK and Norway

Sediment mass-balance analysis provides key constraints on stratigraphic architecture and its controls. We use the data-rich Middle Jurassic Brent Delta sediment routing system in proto-Viking Graben, Northern North Sea, to estimate budgets between source areas depositional sinks. Published studies are synthesised provide an age-constrained sequence framework, consisting of four previously defined genetic sequences (J22, J24, J26, J32). Genetic J32 (3.9 Myr) records transverse progradation basin-margin deltas, sourced from Shetland Platform west Norwegian Landmass east. J24 (1.1 J26 (0.9 record rapid subsequent aggradation along basin axis, uplifted Mid-North Sea High south, western eastern regions. (2.2 retreat Delta. for estimated using palaeogeographical reconstructions, isopach maps, sedimentological core well-log data. The net-depositional budget mapped is 2.0–2.8 Mt/year. Temporal variations were driven by changes tectonic boundary conditions, such as onset uplift before deposition J24. Over same time period, Platform, regions have supplied 2.3–5.6, 5.0–14.1, 2.8–9.4 Mt/year sediment, respectively, BQART load model independent geometrical reconstruction eroded volumes, which constrained isostatic estimates based geochemistry syn-depositional volcanic rocks. sink order-of-magnitude smaller than total (13.9–23 Mt/year). This discrepancy suggests that along-shore transport wave-generated currents into coeval Faroe-Shetland Basin and/or down-dip gravity flows Møre played a role redistributing sediments away system.