Tidal dynamics in palaeo-seas in response to changes in physiography, tidal forcing, and bed shear stress

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1111/sed.12975. This is version 3 of this Preprint.

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Authors

Valentin Zuchuat , Elisabeth Steel, Ryan Mulligan, Daniel Collins, Mattias Green

Abstract

Simulating hydrodynamic conditions in palaeo-ocean basins is needed to better understand the effects of tidal forcing on the sedimentary record. When combined with sedimentary analyses, hydrodynamic modelling can help inform complex temporal and spatial variability in the sediment distribution of tide-dominated palaeo-ocean basins. Herein, palaeotidal modelling of the epicontinental Upper Jurassic (160 Ma, lower Oxfordian) Sundance and Curtis seas of North America reveals possible regional-scale variations in tidal dynamics in response to changes in ocean tidal forcing, physiographic configuration and bottom drag coefficient. A numerical model forced with an M2 tidal constituent at the open boundary shows that the magnitude and location of tidal amplification, and the variability in current velocity and bed shear stress in the basin, were controlled by palaeophysiography. Numerical results obtained using a depth of 600 m at the ocean boundary of the system enable the prediction of major facies trends observed in the lower Curtis Formation. The simulation results also highlight that certain palaeophysiographic configurations can either permit or prevent tidal resonance, leading to an overall amplification or dampening of tides across the basin. Furthermore, some palaeophysiographic configurations generated additional tidal harmonics in specific parts of the basins. Consequently, similar sedimentary successions can emerge from a variety of relative sea-level scenarios, and a variety of sedimentary successions may be deposited in different parts of the basin in any given relative sea-level scenario. These results suggest that the interpretation of sedimentary successions deposited in strongly tide-influenced basins should consider changes in tidal dynamics in response to changing sea level and basin physiography.

DOI

https://doi.org/10.31223/X50S3G

Subjects

Physical Sciences and Mathematics

Keywords

sequence stratigraphy, Upper Jurassic, palaeooceanography, tidal deposits, relative sea-level change, non-uniqueness, sequence stratigraphy, Upper Jurassic, Curtis Formation, palaeooceanography, tidal deposits, relative sea-level change, non-uniqueness, Curtis Formation

Dates

Published: 2020-12-21 12:13

Last Updated: 2022-05-11 23:58

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License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
All the data necessary for these simulations (>500 Gb) can be saved on external hard-drives and sent by mail

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