Ore Dep 2

Question 1

ore that is being deposited through direct crystallization of Magma.

Answer 1

Magmatic Segregation deposits

Question 2

usually** formed in the magma chamber**, thus are deep-seated intusive bodies but are differentiated or immiscble melt and crystal mush can be derived into magma chamber walls or roof to orebodies that are dikes, sills and even extrusive flows.

Answer 2

Magmatic Segregation deposits

Question 3

in Magmatic segregation, the ore is a product of early or late fractionation due to?

Answer 3

Gravitative setting
immiscibility
filter pressing

Question 4

a large sill-like body of igneous rock which exhibits vertical layering or differences in composition and texture

Answer 4

Layered mafic Intrusions (LMI)

Question 5

refers to the activity of oxygen and sulfur

(based on discussion)

Answer 5

Fugacity

Question 6

the first to a reaction in LMI is?

Answer 6

Oxygen

Question 7

in LMI, Chromium goes with?

Answer 7

Oxygen

Question 8

in LMI, PGEs and Nickel goes with

Answer 8

Sulfur

Question 9

occurs in plutonic igneous setting and appeared to be intruded into a more or less stable craton

Answer 9

Layered Cr-Pt Mafic-Ultramafic Complex

Question 10

age of most economically important LMI

Answer 10

Proterozoic

Question 11

LMI are layered with the average composition of?

Answer 11

Gabbro

Question 12

there are ____ known layered igneous complexes in the world

Answer 12

8

Question 13

out of the 8 known layered igneous complexes, only _____ have significant chronium

Answer 13

3

Question 14

A Layered igneous complex that is mined for chromium.

Answer 14

Bushveld igneous complex

Question 15

A Layered igneous complex that is mined for platinum.

Answer 15

Great Dyke

Question 16

Bushveld igneous complex is found in

Answer 16

South Africa

Question 17

Great Dyke is found in

Answer 17

Zimbabwe

Question 18

Largest PGE resource

Answer 18

Merensky Reef

Question 19

considered as the largest Cr resource, holding 70% of the world’s cr resource

Answer 19

Bushveld

Question 20

90% or more of the intermediate to calcic plaioclase. it is also the source of almost all “hard rock” source of Ti

Answer 20

Anorthosite-Titanium

Question 21

Largest Ni resource in the world

Answer 21

Sudbury (,canada)

Question 22

2 types of An-Ti deposits

Answer 22

1. Layered mafic intrusions characterized by Anorthite (An 70-100)
2. Proterozoic “massifs” containing plag from Andesine to labradorite (An 35-65)

Question 23

a volatile-rich, potassic ultramafic-related phreatomagmatic breccia pipe or igneous dike dominated by olivine, with subordinate minerals of mantle derivation.

Answer 23

Kimberlite

Question 24

Kimberlites are first recognized in?

Answer 24

Kimberly, South Africa

Question 25

Kimberlites are surprisingly ____________ assemblages

Answer 25

free of alteration

Question 26

a jet of air is activated by photocelss that perceive visible light flourescene included in diamond by an x-ray beam as concentration moves along a V-belt.

Answer 26

Sortex Method

Question 27

2 methods used to recover diamonds

Answer 27

heavy-liquid separation
Sortex Method

Question 28

Cylindrical pipe-like bodies of calciye, dolomite and/or siderite that are prominently concentrically zoned.

Answer 28

Carbonatites

Question 29

Carbonatites are mined for?

Answer 29

REE

Question 30

2 general types of Carbonatites

Answer 30

Magnetite-apatite rich
REE-Fl-Ba-rich

Question 31

Kimberlites occur in

Answer 31

Continental settings

Question 32

Largest concentration of kimberlites can be found in

Answer 32

East African Rift system

Question 33

Only ____% of kimberlites contain diamonds

Answer 33

1

Question 34

greatest concentration of kimberlites can be found on rocks aged ?

Answer 34

Mesozoic Age

Question 35

DIamonds in Kimberlites occurs as

Answer 35

Sparse Xenocrysts

Question 36

a form of material degration occuring when the microstructure of some carbons and low alloy steels break down after long exposure to elevated temperatures

Answer 36

Graphitization

Question 37

the partial or complete remelting or dissolution of a mineral by magma, resulting from changes in temperature, pressure or magma composition.

Answer 37

Resorption

Question 38

Podiform chromite is also know as?

Answer 38

Alphine-type Chromite

Question 39

ophiolite related which formed in mid-oceanic ridges or back-arc basin spreading centers & tectonically obducted onto continental or island arc margins

Answer 39

Podiform chromite

Question 40

1st layers of ophiolite sequence

Answer 40

Deep sea siliceous or ocherous sediments with Radiolarian chert

Question 41

2nd layer of ophiolite sequence

Answer 41

Layered pillow basalts cut by sheeted diabase dikes

Question 42

3rd layer of ophiolite

Answer 42

Gabbro/norites + serpentinized flmafic to ultramafic rocks

Question 43

An earthy usually red or yellow and often impure iron ore used as a pigment

Answer 43

Ocherous

Question 44

Podiform chromite are form in

Answer 44

Structurally active area

Question 45

Stratified chromite are form in

Answer 45

Stable craton

Question 46

Podiform chromite is distributed in

Answer 46

Paleozoic or younger tectonic belts associated with convergent plate boundaries

Question 47

Podiform chromite setting

Answer 47

Structurally complex setting with extensive post-ore deformation

Question 48

Interpreted to be a product of interaction bett mantle harzburgite and an exotic magma

Answer 48

Podiform chromite with a dunite envelope

Question 49

2 types of igneous iron deposit

Answer 49

(1) Volcano-sedimentary or sedimentary deposit

(2) intrusive magmatic segregation ore

Question 50

Biggest iron skarn deposit in the Philippines.

Answer 50

Larap (or larap skarn deposit)

Question 51

Most important intrusive iron ore deposit

Answer 51

Kiirunavaara Mine

Question 52

Universally refers to high phosphorus iron ore

Answer 52

Kiruna type ore