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MROP > Iron > Flashcards

Iron Flashcards

1
Q

Most common element on earth by mass

A

Fe

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2
Q

Fe consitures about __ of the earths crust

A

5%

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3
Q

Most significant ores

A

Hematite, Goethite

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4
Q

Hematite

A

Fe₂O₃

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5
Q

Goethite

A

FeO(OH)

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6
Q

Magnetite

A

(Fe3O4)

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7
Q

Limonite

A

(FeO(OH)·nH2O)

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8
Q

Densest of iron ores

A

Magnetite

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9
Q

Most important ore

A

Hematite

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10
Q

Amorphous, yellowish brown streak

A

Limonite

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11
Q

Forms under oxidizing conditions as a weathering product of iron minerals.

A

Goethite

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12
Q

Siderite

A

(FeCO3)

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13
Q

Crystalline, reacts to cold dilute hydrochloric acid. Forms in sedimentary and hydrothermal environments as well as in carbonatites

A

Siderite

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14
Q

Skarn Formation

A

Contact metamorphism between carbonate rocks and intrusive magmas.

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15
Q

Skarn deposits form at the __________________ through _______ where hot, mineral-laden fluids alter the composition of the rock, leading to ore mineralization.

A

boundary between igneous and sedimentary rocks; metasomatism,

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16
Q

Key Location of Ph Skarn Deposits

A

Larap, Cam Norte; Other areas in Cordilleras

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17
Q

Concentration by wave and current action in coastal environments.

A

Magnetite sand deposits

18
Q

Magnetite sand deposits are formed by the ____________, with magnetite being concentrated by _____________

A

erosion of igneous and metamorphic rocks; wave and current action in coastal environments.

19
Q

Key Location of Ph Magnetite Sand Deposits

A

N and W coasts of Luzon, Ilocos and Cagayan Valley

20
Q

Intense weathering of ultramafic rocks in tropical climates.

A

Laterite Desposits

21
Q

By-Products of Laterite Deposits

A

Nicket and Cobalt

22
Q

Statigraphy of Laterite Deposite from top to bottom

A

Ferricrust, Limonite Zone (Hematite), Limonite Zone (Goethite), Clay rich soils, Saprolite, Unweathered Ultramafics

23
Q

Laterite deposits are_______________rich in iron and aluminum, formed in hot and wet tropical areas.

A

highly weathered soils

24
Q

Rich in nickel, often associated with cobalt and iron.; covers ultramafics

A

Nickeliferous Laterites

25
Q

High in aluminum, serving as the primary source of aluminum ore.

A

Aluminous Laterites (Bauxite):

26
Q

Key Location of Ph Laterite Deposits

A

Surigao, Palawan, Davao

27
Q

Deposition in marine or freshwater environments under reducing conditions

A

Sedimentary Iron Deposits

28
Q

Sedimentary iron deposits, also known as___________________, consist of ___________________. They are primarily formed through the _______________

A

banded iron formations (BIFs); alternating layers of iron-rich minerals and silica or shale; chemical or biological precipitation of iron from seawater.

29
Q

Chemical precipitation from groundwater in marshy or spring areas.

A

Bog and Spring Deposits

30
Q

Located in CamSur, the deposit is characterized by a complex association of iron, copper, and molybdenum, formed through skarnification processes involving the intrusion of magmatic fluids into carbonate rocks, leading to the alteration and mineralization of the surrounding rocks.

A

Larap Iron-Copper-Molybdenum Skarn Deposit

31
Q

Red Variety of Hematite

A

Red Ocher

32
Q

Metallic Variety of Hematite

A

Specularite

33
Q

Economic magnetite sand deposits contains what percentage of Magnetite and yiels about __ Fe

A

15-30%; 55-60%

34
Q

Beach sand mining is prohibited under

A

Batas Pambansa no 265

35
Q

Silicate Nickel ore

A

Garnierite

36
Q

The iron laterite deposits comprise the surficial __________ meters of soil over mafic and ultramafic rocks that are exposed in more than 5% of the total land area of the archipelago.

A

10 to 15

37
Q

only aluminous laterite iron deposits that have been explored

A

Bucas Grande and Siargao islands in Surigao del Norte Province

38
Q

Age of Cagayan BIF’s

A

Pliocene to Pleistocene

39
Q

Age of CamSur BIF’s

A

Cretaceous

40
Q

relatively important bog iron sedimentary deposit

A

Taan, Nueva Viscaya

MROP (6 decks)

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