1 / 11

Continental-Margin Sedimentation during High Sea Level

This article explores sedimentation processes occurring on continental margins during high sea levels, particularly focusing on fluvial and glacial valley inundation. It discusses how sediments are trapped in river-mouth estuaries and fjords, and the formation of deltas under substantial sediment supply. The study examines the dynamics of sediment escape to the continental shelf, including wave-induced transport of mud and sand, and the implications for collision margins. Additionally, it features the Eel River drainage basin in northern California, highlighting turbidity currents and sediment deposits.

colorado-morse
Télécharger la présentation

Continental-Margin Sedimentation during High Sea Level

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Continental-Margin Sedimentation during High Sea Level Fluvial and glacial valleys flooded Sediments trapped in river-mouth estuaries and fjords If much sediment supplied, estuaries and fjords are filled deltas formed Sediment can escape to continental shelf mud winnowed by waves leaving sand nearshore mud transported to middle shelf On collision margins (narrow, steep shelf) sediment can escape to continental slope

  2. Holocene deposits (<20,000 y) on continental shelves Note: boundary between modern inner-shelf sand and modern mid-shelf mud depends on waves

  3. Washington continental shelf

  4. Continental-Margin Sedimentation during High Sea Level Fluvial and glacial valleys flooded Sediments trapped in river-mouth estuaries and fjords If much sediment supplied, estuaries and fjords are filled deltas formed Sediment can escape to continental shelf mud winnowed by waves leaving sand nearshore mud transported to middle shelf On collision margins (narrow, steep shelf) sediment can escape to continental slope

  5. 0 0 0 0 0 3 4 0 0 0 0 2 0 8 0 0 0 1 0 0 0 0 0 7 4 0 6 2 5 0 0 6 5 0 5 5 2 0 1 9 3 0 0 7 0 5 3 1 Eel margin California Elevation 0 m 350 1400 Eel River Drainage Basin 41o00’ 40o50’ 40o40’ 124o40’ 124o30’ Study Area Eel River Drainage Basin ~9000 km2

  6. Eel Canyon, northern California Multiple entrants that are presently receiving sediment and experience many turbidity currents each year

  7. DUPLICATE CORES Larry Channel Thalweg  = 137 m L1C12 L1C13 L1C12 L1C13

More Related