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Diagram showing patterns of erosion and deposition that produce seafloor pockmarks

Detailed Description

A diagram illustrating how the patterns of erosion and deposition associated with three sediment gravity flows could produce the stacked pockmarks and lateral migration observed in AUV-collected Chirp profiles. Long, uneventful episodes of hemipelagic drape (a, d, g, j) are intermittently interrupted by sediment gravity flows that either: 1b. Erode through the accumulated hemipelagic drape, deepening and potentially shifting the pockmark centers before 1c. Leaving a regional turbidite with thicker deposits in pockmark centers. 2e. Pass by without noticeable erosion, and 2f. Deposit a regional turbidite with thicker deposits in pockmark centers or 3h. Cause significant erosion in pockmark centers, eroding through hemipelagic drape as well as buried turbidites, and 3i. Leave a regional turbidite with a thick flat-top sandy deposit in pockmark centers. Note, that while this diagram illustrates the pockmarks migrating downflow, no consistent migration direction is seen in the Chirp data.


Public Domain.