Worksheet 3
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Louisiana State University *
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Course
102
Subject
Geology
Date
Dec 6, 2023
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docx
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Uploaded by DukeWillpower12528
Chapter 5 – Sediments T.P. Sampere
Question
Answer 1
Define Sediments
Loose accumulations of particulate material
2
The two most abundant sediment types are a. terrigenous
b. biogenous
3
The oldest seafloor is about how Old? Why is this so young compared
to the 4.6 Billion Years of Earth history.
180 Million years. They are fairly young because they are subducted at active margins. 4
Sediments can be classified according to the size of the ______.
Particle
5
What is the size range for Coarse Sand?
0.5 – 1 mm
6
Clay is smaller than ____ mm
0.0039 mm
7
How would Terrigenous Sediment get into the Ocean?
Terrigenous sediments come from erosion of land, volcanic eruptions, and blown dust
8
Biogenous Sediments form from the remains of _______.
Marine organisms
9
What is a Hydrogenous Sediment?
Precipitate directly from seawater
10
What type of sediments do you see in the Atlantic Ocean? Hint look at the figure in your lecture notes that is a map of main sediment types in the ocean basins.
Continental shelf deposits, Land-derived sediments,
Calcareous ooze, and Siliceous ooze
11
Where are some areas where sediment is very thick >5000 meters? Hint it is on a figure in your notes. The Gulf Coast of North America, South China Sea, and the Bay of Bengal East of India
12
In Table 5.3 shows some statistics. Where is most of the marine sediment by Volume contained (which features). Most of the marine sediment volume is located at the Continental Slopes. 13
The deep ocean floor is 78% of the Area of the Oceans but only ___ percent of the volume of marine sediments?
13%
14
Generally, sediments are deeper on average in the Atlantic? Why
Pelagic sediments vary in composition and thickness. the Atlantic Ocean bottom is covered with about 1 kilometer and the Pacific Ocean is covered about 0.5 kilometer with sediment. 15
What feature is deposited by Turbidity Currents? What drives the movement of a Turbidity Current?
Turbidites. Gravity. 16
About what percent of the deep seabed is covered by clays?
About 38%
17.
What are the two main type of Oozes?
Siliceous ooze
Calcareous ooze
18. What does CCD stand for?
Calcium carbonate compensation depth
Chapter 5 – Sediments T.P. Sampere
19. About what percent of the deep ocean basins are covered by calcareous ooze?
About 48%
20.
What does Siliceous Ooze form from? What percent of the Ocean bottom is covered by this Ooze?
About 14%
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