Alterations

Question 1

Type of alteration where rocks turn green

Answer 1

Propylitic Alteration

Question 2

Propylitic Alteration occurs at relatively ______________

Answer 2

Low Temperature

Question 3

Propylitic Alteration is characterized by what mineral(s)?

Answer 3

Chlorite, Epidote, Antinolite

Question 4

Usually form from decomposition of Fe-Mg bearing minerals

Answer 4

Propylitic Alteration

Question 5

Forms from decomposition of feldspars.

Answer 5

Sericitic Alteration

Question 6

In Sericitic Alteration, rocks are altered into what mineral?

Answer 6

Sericite

Question 7

An alteration consist of sericite and quartz

Answer 7

Phyllic Alteration

Question 8

High temperature type of alteration which results from potassium enrichment

Answer 8

Potassic Alteration

Question 9

Minerals associated with Potassic alteration

Answer 9

Biotite, K-feldspar, Adularia

Question 10

Potassic alteration can occur in?

Answer 10

(a) Deep plutonic environment
(b) Shallow volcanic environment

Question 11

This mineral is formed in shallow volcanic environment

Answer 11

Adularia

Question 12

Can form before complete crystallization of magma

Answer 12

Potassic Alteration

Question 13

A relatively high temperature type of alteration where albite or sodic plagioclase are formed.

Answer 13

Albitic

Question 14

It’s presence usually indicates Na Enrichment

Answer 14

Albitic Alteration

Question 15

A process by which Ca-bearing plagioclase feldspar is altered to a characteristic assemblage of saussurite

Answer 15

Saussurotization

Question 16

A type of alteration where pyroxene is changed into amphibole

Answer 16

Uralitization

Question 17

A type of alteration where secondary silica (SiO2) is added

Answer 17

Silicification

Question 18

It is one of the most common type of alteration and occurs in many different styles

Answer 18

Silification

Question 19

Silification can occur in ________ temperature

Answer 19

Wide range

Question 20

General term for addition of silica by forming any type of silicate mineral

Answer 20

Silication

Question 21

Formation of a type of rock called greisen

Answer 21

Greisenization

Question 22

General term for the addition of any type of carbonate mineral

Answer 22

Carbonatization

Question 23

Type of alteration that is closely associated with certain hot springs environment.

Answer 23

Alunitic

Question 24

The presence of this mineral suggest high SO4 content

Answer 24

Alunite

Question 25

Presence of alunite suggest ______

Answer 25

High SO4 content

Question 26

Low temperature, acidic alteration

Answer 26

Argilic

Question 27

Type of alteration that includes the bleaching out of feldspars

Answer 27

Argilic alteration