The influence of allogenic controls on facies variability within two basins: the Triassic Sherwood Sandstone Group of Central and Northern England

Cripps, Cath; Wakefield, Ol; Hough, Ed; Thompson, Jo. 2016 The influence of allogenic controls on facies variability within two basins: the Triassic Sherwood Sandstone Group of Central and Northern England. [Lecture] In: 55th British Sedimentological Research Group Annual General Meeting, Cambridge, UK, 18-20 Dec 2016. British Geological Survey. (Unpublished)

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Allogenic controls (tectonics, eustasy, and climate) on sedimentation are thought to exert the most influence on depositional trends seen within sedimentary basin fill. This study examines two adjacent early Triassic basins, with similar allogenic factors of climate, eustasy and sediment supply. What is unclear is how the expression of facies/depositional trends might manifest in these two tectonically different, but otherwise similar, basins. The East Midlands shelf, is a passive shelf-edge basin marginal to the South Permian Basin. The Needwood Basin, in contrast, is a half graben created by extensional tectonics and typified by normal synsedimentary faulting. Much of the sediment supply to the basins was derived from a single sediment source (the London-Brabant High and Armorican Massif) located in present-day SE England and Northern France, with a local input to the Needwood Basin from the Pennine high. Architectural element and lithofacies analysis on three selected outcrops, and borehole logging on 8 boreholes, was conducted from across the two basins. This indicates that both basin successions comprise amalgamated channel fill, with emphasis on downstream accreting elements. In the East Midlands Shelf (Yorkshire-Nottinghamshire), the sedimentary basin infill is characterised by sandy, trough cross-bedded sequences; palaeoenvironmental interpretation suggests a sandy braided river environment. Successions from the Needwood Basin are indicative of a higher depositional energy, possibly influenced by proximity to several sources of sediment into an actively subsiding basin. Tectonic allogenic forcing factors exert a large degree of influence on depositional trends in both basins. Most notably, the degree of subsidence and distance from the basin margin is thought to have the most effect on facies type and distribution. This enhances our understanding of facies predictability and depositional trends away from data points, and can feed into the development of better reservoir models.

Item Type: Publication - Conference Item (Lecture)
Additional Keywords: Sherwood Sandstone, Triassic, Allogenic, Tectonic, Eustasy, Climate, Basin, London-Brabant High, Armorican Massif, Needwood Basin, Architectural element, East Midlands Shelf
Date made live: 12 May 2017 14:03 +0 (UTC)

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