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Fluvio-deltaic avulsions during relative sea-level fall.

Nijhuis, A. G.; Edmonds, D. A.; Caldwell, R. L.; Cederberg, J. A.; Slingerland, R. L.; Best, J. L.; Parsons, D. R.; Robinson, R. A. J.

Authors

A. G. Nijhuis

D. A. Edmonds

R. L. Caldwell

J. A. Cederberg

R. L. Slingerland

J. L. Best

R. A. J. Robinson

Abstract

Understanding river response to changes in relative sea level (RSL) is essential for predicting fluvial stratigraphy and source-to-sink dynamics. Recent theoretical work has suggested that rivers can remain aggradational during RSL fall, but field data are needed to verify this response and investigate sediment deposition processes. We show with field work and modeling that fluvio-deltaic systems can remain aggradational or at grade during RSL fall, leading to superelevation and continuation of delta lobe avulsions. The field site is the Goose River, Newfoundland-Labrador, Canada, which has experienced steady RSL fall of around 3–4 mm yr⁻¹ in the past 5 k.y. from post-glacial isostatic rebound. Elevation analysis and optically stimulated luminescence dating suggest that the Goose River avulsed and deposited three delta lobes during RSL fall. Simulation results from Delft3D software show that if the characteristic fluvial response time is longer than the duration of RSL fall, then fluvial systems remain aggradational or at grade, and continue to avulse during RSL fall due to superelevation. Intriguingly, we find that avulsions become more frequent at faster rates of RSL fall, provided the system response time remains longer than the duration of RSL fall. This work suggests that RSL fall rate may influence the architecture of falling-stage or forced regression deposits by controlling the number of deposited delta lobes.

Journal Article Type Article
Publication Date 2015-08
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 43
Issue 8
Pages 719-722
Institution Citation Nijhuis, A. G., Edmonds, D. A., Caldwell, R. L., Cederberg, J. A., Slingerland, R. L., Best, J. L., …Robinson, R. A. J. (2015). Fluvio-deltaic avulsions during relative sea-level fall. Geology, 43(8), 719-722. https://doi.org/10.1130/g36788.1
DOI https://doi.org/10.1130/g36788.1
Keywords Geology
Publisher URL http://geology.gsapubs.org/content/43/8/719
Additional Information Authors' accepted version of article: A.G. Nijhuis, D.A. Edmonds, R.L. Caldwell, J.A. Cederberg, R.L. Slingerland, J.L. Best, D.R. Parsons, and R.A.J. Robinson. Fluvio-deltaic avulsions during relative sea-level fall. Geology, August 2015, v. 43, p. 719-722, first published on July 10, 2015, doi:10.1130/G36788.1

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