Depositional evolution of a progradational to aggradational, mixed-influenced deltaic succession: Jurassic Tofte and Ile formations, southern Halten Terrace, offshore Norway

Abstract

Hightlights:• Core-based sedimentology of Jurassic deltaic strata from offshore Norway• Facies analysis of tide-influenced deltaic and estuarine petroleum reservoirs represented by an overall upward decrease in grain size, decrease in fluvial influence and increase in tidal influence. This evolution is attributed to an allogenic increase in the rate of accommodation space generation relative to sediment supply due to tectonic activity of the rift basin. In addition, during progradation, there was also an autogenic increase in sediment storage on the coastal plain, resulting in a gradual autoretreat of the depositional system. This is manifested in the subsequent aggradation of the system, when coarse-grained sandstones were trapped in proximal locations, while only finer grained sediment reached the coastline, where it was readily reworked by tidal and wave processes.

Mud‐rich delta‐scale compound clinoforms in the Triassic shelf of northern Pangea (Havert Formation, south‐western Barents Sea)

“…closer to the coastline), and therefore it appears to be not as strong as in the well‐studied Jurassic deposits of the Mid‐Norwegian shelf (e.g. Martinius et al ., ; Eide et al ., ; van Cappelle et al ., ). The depositional model for the Havert Formation (Fig.…”

“…Interpretation: The suite of sedimentary structures exhibited in FA4 records alternation between low‐energy conditions and input of coarser sediment from tractional currents. The presence of mud drapes, possible bidirectional palaeocurrents and heterolithic nature of the deposits is indicative of deposition from tidal currents (Reineck & Wunderlich, ; Dalrymple, ; van Cappelle et al ., ). The presence of low‐angle lamination, HCS and symmetrical ripples are interpreted as the result of wave action (fair‐weather and storm waves).…”

“…The presence of low‐angle lamination, HCS and symmetrical ripples are interpreted as the result of wave action (fair‐weather and storm waves). The suite of sedimentary structures and vertical association with FA6 is indicative of deposition in a subtidal to intertidal environment, such as a tide‐influenced open coastline or tidal flat (Yang et al ., ; Fan, ; van Cappelle et al ., ). The bioturbation intensity is quite low, pointing towards stressed conditions (for example, brackish water or high and variable sedimentation rates).…”

Controls on tidal sedimentation and preservation: Insights from numerical tidal modelling in the Late Oligocene–Miocene South China Sea, Southeast Asia

“…Van Wagoner, ; Posamentier & Allen, ); (ii) shorelines, including deltas, that are undergoing regression (e.g. Martinius et al ., ; Legler et al ., ; van Cappelle et al ., ) or aggradation (e.g. Olariu et al ., ); (iii) along various types of coastline adjacent to wide (>75 km) shelves (e.g.…”

Straight from the source's mouth: Controls on field‐constrained sediment export across the entire active Corinth Rift, central Greece

“…To quantify the total Holocene sediment budget averaged over the Holocene, we estimated the bedload sediment budget using a range of ratios. This is because the ratio of bedload to suspended load has been shown to be highly variable and also difficult to obtain (e.g., Turowski, Rickenmann, & Dadson, 2010), as such we adopt the ratio of 35:65 bedload to suspended load (Pratt-Sitaula et al, 2007) with upper and lower ratios of 45:55 and 25:75, respectively, based off field data, to acknowledge the wide uncertainties. We adopted a ratio of 35:65 for bedload to suspended load (Pratt-Sitaula et al, 2007), which is based on field-derived bedload and suspended fractions from the Marsyandi River, Himalayas, a steep gravel-bedded mountain catchment for the last 5,000 years (Pratt-Sitaula et al, 2007).…”