Lecture 13 - Deep Sea Sediments part 1 Flashcards

1
Q

What are the dominant se sediments

A

1) red clays
2) siliceous ooze
3) calcerious ooze
4) terrigenous sediments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

LOOK AT MAP IN LECTURE 13!!

A

for info on which is where in the oceans

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Red clay properies

A

Mostly wind blow sediment, deposited at contiental margins.

Mostly quatz and clay minerals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the four main types of clay minerals

A

Kaolninte (formed in extreme chemical weathering)
Chlorite (igneous and metamohic rocks destroyed by chem weathering
Illite (aboudant and windspread)
Montmorillonite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Offshore antartic, what can be found here

A

Clay minerals produced by physical weathering (cold climate)

underneath clay produced by chemical weather (warm climate)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Volcanoes and ash

A

Volcanes emit ash and dust, the very smallest particals can travel around the world before they are deposited

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The K-T boundary

A

this is a few cm thick, and tottaly deviod of fossils

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the element that was used to disover a metore

A

Iridium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Properties of iridium

A

Very rare in the earths crust, present in cosmic dust and it was found an interval or time in each clay layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the two types od Siliceous ooze

A

Diatoms and Radiolaria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Properties of Diatoms

A

Uniculluar alega with shels, abudance in high lat sillicous oozes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Radiolario properties

A

Zooplankton with silicoues tets, dominant compont of low lat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the controls od distribution on siliceous oozes

A

Supply, Preservation, Dilution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Main factor is siliecous ooze deposits

A

Upwelling forms nutrient rich waters which in turn producges high productivity and therefore high concetnrations of silicous oozes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How can diatoms be used with sea ice?

A

Diatoms can be used to map the changes in the sea ice (effecting the amount of co2 released from the atmopshere)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Diatoms relationship with ice sheets

A

Where ice sheet covers the water no diatoms will be present as there are no sedimentaion rates, when ice sheets are not there upwelling causes diatom formation in the sedimnetay rock record