Ironstones/Carbonaceous

Question 1

-Significant non-clastic sedimentary rocks dominantly composed of iron that may be in the form of oxides, hydroxides, carbonates, sulfides, or silicates.
-Rocks with high concentrations of iron.

Answer 1

Ironstones

Question 2

Most of the iron mined today is from Precambrian rocks known as?

Answer 2

Banded Iron Formations (BIF).

Question 3

What are the types of Banded Iron Formation?

Answer 3

1. Algoma-type - Archean (3.8-2.8 Ga)
2. Superior-type - Proterozoic (2.6-1.8 Ga and 0.8-0.5 Ga)
3. Rapitan-type- Snowball Earth Period

Question 4

A major type of BIF that dominate the Archean iron-rich sedimentary rocks that formed between 3.8 Ga and 2.6 Ga.

Answer 4

Algoma-type

Question 5

A major type of BIF that
dominate Proterozoic iron-rich sedimentary rocks that formed between 2.6 Ga and 1.8 Ga and again from 0.8 Ga to 0.5 Ga, and are supposedly much larger compared to the Algoma-type BIF

Answer 5

Superior-type

Question 6

A type of BIF that deposited immediately during glaciation during the Snowball Earth period, where global anoxia causes the presence of dissolved ferrous iron in seawater. Similar to Superior but have little economic significance.

Answer 6

Rapitan-type

Question 7

Non-clastic sedimentary rocks that is rich in carbonaceous or organic components.

Answer 7

Carbonaceous

Question 8

Organic-rich deposit that generally form in swamps where organic materials may be preserved.

Answer 8

Peat

Question 9

Remains of plant materials that accumulate underwater in anoxic conditions.

Answer 9

Sapropel

Question 10

Sedimentary rocks that are rich in solid organic matter.

Answer 10

Coal

Question 11

A classification of coal based on how “cooked” they are.

Answer 11

Coal Rank

Question 12

List the ranks of coal in order

Answer 12

1. Lignite
2. Sub-bituminous
3. Bituminous
4. Anthracite

Question 13

Mudrocks that are rich in organic materials that can be extracted in the form of liquid (oil) or gas (natural gas).

Answer 13

Oil Shales