Depositional dynamics and sequence development in a tidally influenced marginal marine basin

Ahokas, Juha; Nystuen, Johan Petter; Martinius, Allard W.

doi:10.1002/9781118920435.ch12

Cited by 8 publications

(6 citation statements)

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“…Since the 1990s, modern mixed‐energy coasts have been investigated and processes are better constrained (Short, ; Masselink & Short, ; Li et al ., ; Yang & Chun, ; Anthony & Orford, ; Yang et al ., ; Masselink et al ., ; Vaucher et al ., ,b). Ancient mixed‐energy coastal environments are being increasingly documented in the literature (Vakarelov et al ., ; Ahokas et al ., ; Leva López et al ., ; Rossi & Steel, ; Vaucher et al ., ; Peng et al ., ; Zhang et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Changes in hydrodynamic process dominance (wave, tide or river) in foreland sequences: The subalpine Miocene Molasse revisited (France)

et al. 2020

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A comprehensive sedimentological study was undertaken in the Miocene of the subalpine massifs and southern Jura (France) with the aim to constrain the evolution of process changes in third‐order sequences of peripheral foreland basins during the overfilled phase (i.e. sediment supply higher than accommodation space). Fieldwork analyses based on 35 sedimentological sections allowed the identification of four depositional models: wave dominated, mixed wave‐tide, river to tide and river dominated. The sections were dated using chemostratigraphy (i.e. marine strontium isotopic ratios), revealing three‐third‐order sequences between the Upper Aquitanian and the Langhian. Chronostratigraphical and sedimentological results document prominent and recurrent changes in depositional models along third‐order sequences: (i) in the earliest stage of the transgression, mixed‐energy coastal environments influenced by the local coastal morphology prevailed (in palaeo‐highs or incised valleys); (ii) during the course of the transgression, Gilbert delta deposits suggest a prominent steepening linked to a tectonic uplift in the proximal depozone (between the tectonically active frontal part of the orogenic wedge and the proximal foredeep). Instead, in the distal depozone (between the proximal foredeep and the proximal border of the flexural uplifted forebulge), deposits were characterized either by wave‐dominated or mixed wave‐tide environments and are likely eustatically‐driven; (iii) during the maximum flooding stage, water depth remained shallow below the storm‐weather wave base; and (iv) during the regression, the proximal depozone is characterized by the progradation of gravel‐rich fan deltas. In the distal depozone, mixed wave‐tide systems preceded the development of river to tidal depositional environments. These results were integrated and compared with facies models from other basin analogues worldwide. A model tackling the evolution of process changes within third‐order sequences (of the overfilled phase) of foreland basins is proposed, thereby improving sequence stratigraphic predictions in foreland basins.

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Section: Introductionmentioning

confidence: 99%

Changes in hydrodynamic process dominance (wave, tide or river) in foreland sequences: The subalpine Miocene Molasse revisited (France)

et al. 2020

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“…This basin offers a unique opportunity to understand magma transport through the crust and sedimentary basin on scales from centimetres to tens of kilometres because 1) about 3 km of post-emplacement erosion (Mathiesen et al 2000, Hansen et al 2001 has dissected the mafic intrusions leading to extensive unvegetated outcrops where dykes (subvertical igneous sheets) and sills (broadly layer-concordant igneous sheets) can be readily investigated in large 10's km scale outcrops (Figs 2, 3), 2) there is a well-constrained stratigraphy due to widespread outcrops and decades of surface and subsurface geological investigations (e.g. Surlyk et al 1973;Dam & Surlyk 1998, Ahokas et al 2014Eide et al 2016Eide et al , 2017Guarneri et al 2017;Brethes et al 2018), 3) extensive refraction seismic surveys have been performed directly offshore from the outcrops, leading to good control on the crustal structure and P-wave velocities in the basin (Fig. 1B; Weigel et al 1995;Mandler & Jokat 1998), and 4) because an onshore 2D grid of reflection seismic data (Fig.…”

Section: Introductionmentioning

confidence: 99%

Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland

Eide

Schofield

Howell

et al. 2021

JGS

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Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection data and extensive outcrops give unparalleled constraints on mafic intrusions down to 15 km. This dataset shows how sill-complexes develop and how magma is transported from the mantle through sedimentary basins. The feeder zone of the sill-complex is a narrow zone below a basin, where a magmatic underplate body impinges on thinned crust. Magma is transported through the crystalline crust through dykes. Seismic data and published geochemistry indicate that magma is supplied from a magmatic underplate without perceptible storage in crustal magma chambers and crustal assimilation. As magma enters the sedimentary basin, it forms distributed, bowl-shaped sill-complexes throughout the basin. Large magma volumes in sills (4–20 times larger than the Skaergaard Intrusion) and the presence of few dykes highlight the importance of sills in crustal magma transport. On scales smaller than 0.2 km, host-rock lithology, and particularly mudstone tensile strength anisotropy, controls sill architecture in the upper 10 km of the basin, whereas sills are bowl-shaped below the brittle–ductile transition zone. On scales of kilometres and towards basin margins, tectonic stresses and lateral lithological changes dominate architecture of sills.Supplementary material: An uninterpreted and unwarped version of the seismic line in Fig. 4 (DR1), a spreadsheet showing thickness of sills and width of dykes in the study area (DR2), and assumptions and calculations of magma volume (DR3) are available at https://doi.org/10.6084/m9.figshare.c.5670470

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“…The J-3 Unconformity is intrinsically polygenetic, hetero-, and diachronous by nature submitted), comparable to the compound surface discussed by Ahokas et al (2014), as the deposition of the Entrada Sandstone, the Curtis, and the Summerville formations, and the accompanying relative sea-level variations, all influenced the genesis of this bounding surface.…”

Section: Pre-curtis Sea Transgressionmentioning

confidence: 66%

New Insights on the Impact of Tidal Currents on a Low-gradient, Semi-enclosed, Epicontinental Basin—the Curtis Formation, East-central Utah, USA

Zuchuat

Sleveland

Sprinkel

et al. 2018

giw

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Based on a methodic sedimentological analysis, the Late Jurassic (Oxfordian) Curtis Formation unravels the intricate facies variability which occurs in a tide-dominated, fluvially starved, low-gradient, semi-enclosed epicontinental basin. This unit crops out in east-central Utah, between the eolian deposits of the underlying Middle Jurassic (Callovian) Entrada Sandstone, from which it is separated by the J-3 unconformity, and the conformable overlying supratidal Summerville Formation of Oxfordian age. A high-resolution sedimentary analysis of the succession led to the recognition of eight facies associations (FA) with six sub-facies associations. Based on the specific three-dimensional arrangement of these eight facies associations, it is proposed to separate the Curtis Formation into three sub-units: the lower, middle and upper Curtis. The J-3 unconformity defines the base of the lower Curtis, which consists of upper shoreface to beach deposits (FA 2), mud-dominated (FA 3a) and sand-dominated heterolithic subtidal flat (FA 3b), sand-rich sub- to supratidal flat (FA 4a) and correlative tidal channel infill (FA 4c). It is capped by the middle Curtis, which coincides with the sub- to intertidal channel-dune-flat complex of FA 5, and its lower boundary corresponds to a transgressive surface of regional extent, identified as the Major Transgressive Surface (MTS). This surface suggests a potential correlation between the middle and the upper Curtis and the neighboring Todilto Member of the Wanakah Formation or Todilto Formation. The upper Curtis consists of the heterolithic upper sub- to intertidal flat (FA 6) and coastal dry eolian dunes belonging to the Moab Member of the Curtis Formation (FA 7), and it conformably overlies the middle Curtis. The spatial distribution of these sub-units supports the distinction of three different sectors across the study area: sector 1 in the north, sector 2 in the south-southwest, and sector 3 in the east. In sector 1, the Curtis Formation is represented by its three sub-units, whereas sector 2 is dominated by the middle and upper Curtis, and sector 3 encompasses the extent of the Moab Member of the Curtis Formation. This study also highlights the composite nature of the J-3 unconformity, which was impacted by various processes occurring before the Curtis Formation was deposited, as well as during the development of the lower and middle Curtis. Local collapse features within the lower and middle Curtis are linked to sand fluid overpressure within a remobilized sandy substratum, potentially triggered by seismic activity. Furthermore, the occurrence of a sub-regional angular relationship between the middle Curtis and substratum implies that the area of study was impacted by a regional deformational event during the Late Jurassic, before the deposition of the middle Curtis. The spatial distribution of these sub-units supports the distinction of three different sectors across the study area: sector 1 in the north, sector 2 in the south-southwest, and sector 3 in the east. In sector 1, the Curtis Formation is represented by its three sub-units, whereas sector 2 is dominated by the middle and upper Curtis, and sector 3 encompasses the extent of the Moab Member of the Curtis Formation. This study also highlights the composite nature of the J-3 unconformity, which was impacted by various processes occurring before the Curtis Formation was deposited, as well as during the development of the lower and middle Curtis. Local collapse features within the lower and middle Curtis are linked to sand fluid overpressure within a remobilized sandy substratum, potentially triggered by seismic activity. Furthermore, the occurrence of a sub-regional angular relationship between the middle Curtis and substratum implies that the area of study was impacted by a regional deformational event during the Late Jurassic, before the deposition of the middle Curtis.

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Depositional dynamics and sequence development in a tidally influenced marginal marine basin

Cited by 8 publications

References 50 publications

Changes in hydrodynamic process dominance (wave, tide or river) in foreland sequences: The subalpine Miocene Molasse revisited (France)

Changes in hydrodynamic process dominance (wave, tide or river) in foreland sequences: The subalpine Miocene Molasse revisited (France)

Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland

New Insights on the Impact of Tidal Currents on a Low-gradient, Semi-enclosed, Epicontinental Basin—the Curtis Formation, East-central Utah, USA

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