1. Which type of sediment tends to be prevalent in each of the following three m

Question

1. Which type of sediment tends to be prevalent in each of the following three marine locations? Choose one matching answer for each of the four parts.

Continental slope

      [ Choose ]            Biogenous oozes            Glacial-marine sediments            Pelagic clay            Clastic terrigenous sediments - sand, silt, and clay      

Deep ocean floor, ~3-5 km deep

      [ Choose ]            Biogenous oozes            Glacial-marine sediments            Pelagic clay            Clastic terrigenous sediments - sand, silt, and clay      

Polar regions (e.g., Antarctica)

      [ Choose ]            Biogenous oozes            Glacial-marine sediments            Pelagic clay            Clastic terrigenous sediments - sand, silt, and clay      

Deep abyssal plain, >5 km (below the carbonate compensation depth)

      [ Choose ]            Biogenous oozes            Glacial-marine sediments            Pelagic clay            Clastic terrigenous sediments - sand, silt, and clay      

2. What are the three principal agents that transport terrigenous sediments to the ocean? How do these different transport mechanisms influence the character and composition of the sediments formed and determine their sites of deposition?

3. What processes are involved in the movement of terrigenous material from the continental shelf to the continental slope and the continental rise and what features of these sediment deposits facilitate recognition of their transport mechanism?

Explanation / Answer

1) a- continental slope: clastic terrigenous sediments-sand,silt,clay

b-deep ocean floor: pelagic clay

c-polar regions:glacial marine sediments

d-deep abyssal plain:biogenous oozes

2)the agents responsible for transport of terrigenous sediments is wind, river current, sea level, sediment density . the wind and river current carry much more sediments than other agents to the deep sea canyons. but others only influence the transport as low sea level would suggest more terrigenous sediment transport . density of sediment affects the distance of sediment transport . high dense sediments will easily settle down and low density sediments will move a long distance inward.

3)Deep sea canyons are major factors for the sediment transport into the slope and rise . the river current and the incised valley provides major role in tansport of sediments . Sediment density also responsible for the sediment transport . as mentioned before less dense sediments travel long distance inward and high dense sediments settle down easily .

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