603-pp16 - UNIVERSITY OF SOUTH ALABAMA Last Time Submarine...

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1 MAS 603: Geological Oceanography MAS 603: Geological Oceanography Lecture 16: Lecture 16: Greenhouse vs. Icehouse Earths Greenhouse vs. Icehouse Earths UNIVERSITY OF SOUTH ALABAMA Last Time Last Time Submarine Fans Definition and morphology Transport mechanisms (density currents) Submarine fan facies/sedimentary sequences Submarine Canyons and Fans Submarine canyons: major conduits of siliciclastic sediment from the continental shelf to the abyssal plain Submarine fans: accumulations of siliciclastic sediment from the shelf break onto the base of the continental slope ht p:/ www.dkimages.com/discover/previews/851/20117924.JPG Submarine Fans: Transport Mechanisms Mass movement is particularly important as a sediment transport mechanism on submarine fans. Increase in water:sediment ratio From Walker, R.G. (1980). Facies Models. Geological Association of Canada . ht p:/ instruct.uwo.ca/earth-sci/200a-001/07turbidity.jpg On the distal fan, the flow has a high water:sediment ratio and moves as a density current . ht p:/ serc.carleton.edu/ Submarine Fans: Transport Mechanisms Turbidites ht p:/ faculty.gg.uwyo.edu/hel er/Sed%20Strat%20Class/SedStrat%208/bouma.jpg Turbidites are formed as a result of waning flow. A classic Bouma sequence
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2 The Submarine Fan Model This is the best (and simplest) model we have of a submarine fan depositional facies. From Walker, R.G. (1980). Facies Models. Geological Association of Canada . Greenhouse vs Icehouse Earths
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This note was uploaded on 02/10/2012 for the course MAS 603 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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603-pp16 - UNIVERSITY OF SOUTH ALABAMA Last Time Submarine...

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