Ch. 5-7

Question 1

3 big divisions of sed rocks and volume percents

Answer 1

Siliciclastics - 70-75%
     20-25% sandstone
     50% mudstone/shale
Chemical rocks - 20%
     20% Carbonates
Organic-rich rocks - 5-10%

Question 2

What % sed rocks are s clastics?

Answer 2

70-75

Question 3

What % sed rocks are sand stone?

Answer 3

20-25%

Question 4

What % sed rocks are mudstone and shale?

Answer 4

50

Question 5

What % sed rocks are carbonates?

Answer 5

20

Question 6

Most abundant major subcategory of sed rocks?

Answer 6

Mudstone and shale

Question 7

5 subdivs of sc rocks

Answer 7

Cong
Sandst
Siltst
Mudst/shale
Volcanocl

Question 8

5 cats of comps of arenites

Answer 8

Framework grains
Matrix
Cement
Pores
Replacement phases

Question 9

Fn of primary dolomite

Answer 9

Ca + Mg + 2CO3 -> CaMg(CO3)2

Question 10

Fn of secondary dolomite

Answer 10

2CaCO3 + Mg2+ -> CaMg(CO3)2 + Ca

Question 11

How much quartz does an arenite need to be a quartz arenite? (Dott)

Answer 11

90%

Question 12

What do you call an arenite that is less than 90% quartz and has more feldspar than lithics?

Answer 12

Feldspathic arenite

Question 13

In order to qualify as an arenite, a rock needs to have less than what percent matrix?

Answer 13

5%

Question 14

How small are the grains of matrix (Dott)?

Answer 14

<0.03mm

Question 15

What do you call sed rocks with more than 50% matrix?

Answer 15

Mudrocks or shales