Skip to Main Content
Skip Nav Destination
GEOREF RECORD

What conditions are required for deltas to reach the shelf edge during rising sea level?

Jinyu Zhang, Ronald Steel and Cornel Olariu
What conditions are required for deltas to reach the shelf edge during rising sea level?
Geology (Boulder) (December 2017) 45 (12): 1107-1110

Abstract

It is clear from multiple modeling and field studies that deltas can attain a shelf-edge position under conditions of rising sea level, and this is accepted as an alternative way to form submarine fans without relative sea-level lowstand conditions. However, the relative importance and the range of controls that generate this type of shelf-edge deltas are less well known. To investigate these controls, we input the natural range of seven accommodation and morphological variables to a geometric model that estimates the required sediment load to form the highstand shelf-edge delta. We conduct a one-at-a-time sensitivity analysis on each variable to determine their relative importance. Our results suggest that, other than sediment supply, shelf width is the most important control in forcing deltas to the shelf edge during rising sea level. Two of the traditional stratigraphic trinity, i.e., eustatic sea-level change and shelf subsidence, most likely play less important roles than implied in the literature. This result is consistent with a recent trend in sequence stratigraphic studies encouraging consideration of multiple controls in all interpretations, rather than assuming dominant control by relative sea level.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 45
Serial Issue: 12
Title: What conditions are required for deltas to reach the shelf edge during rising sea level?
Affiliation: University of Texas at Austin, Jackson School of Geosciences, Austin, TX, United States
Pages: 1107-1110
Published: 201712
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 2018-024448
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2017380
Illustration Description: illus. incl. sketch map
Secondary Affiliation: National Institute for Marine Geology and Geoecology, ROM, Romania
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 201806
Close Modal

or Create an Account

Close Modal
Close Modal