Durable terrestrial bedrock predicts submarine canyon formation

Geophysical Research Letters
By: , and 

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Abstract

Though submarine canyons are first-order topographic features of Earth, the processes responsible for their occurrence remain poorly understood. Potentially analogous studies of terrestrial rivers show that the flux and caliber of transported bedload are significant controls on bedrock incision. Here we hypothesize that coarse sediment load could exert a similar role in the formation of submarine canyons. We conducted a comprehensive empirical analysis of canyon occurrence along the West Coast of the contiguous United States which indicates that submarine canyon occurrence is best predicted by the occurrence of durable crystalline bedrock in adjacent terrestrial catchments. Canyon occurrence is also predicted by the flux of bed sediment to shore from terrestrial streams. Surprisingly, no significant correlation was observed between canyon occurrence and the slope or width of the continental shelf. These findings suggest that canyon incision is promoted by greater yields of durable terrestrial clasts to the shore.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Durable terrestrial bedrock predicts submarine canyon formation
Series title Geophysical Research Letters
DOI 10.1002/2017GL075139
Volume 44
Issue 20
Year Published 2017
Language English
Publisher American Geophysical Union
Contributing office(s) Southwest Biological Science Center
Description 9 p.
First page 10332
Last page 10340