METAMORPHIC PETROLOGY (PROTOLITH-BASED CLASSIFICATION)

Question 1

These includes aluminum rich protoliths

Answer 1

Pelite protoliths

Question 2

Main oxides in pelitic met rocks

Answer 2

SiO2, Al2O3, K2O

Question 3

what are the protliths considered as pelite?

Answer 3

Shale
Mudstone
Altered volcanic tuff (Bentonite)

Question 4

Minerals which are altered in pelithic protolith?

Answer 4

Clay (Kaolinite, Smectite, and Illite)

Question 5

What are the resulting altered minerals which serves as Geothermobarometers?

Answer 5

Aluminosilicates

Question 6

Pelitic protoliths (Mudstones) subjected to high T and nonuniform stress forms?

Answer 6

Slates, Phyllite and mica schist

Question 7

If pelitic protoliths are subjected only in high T in contact met what rock will form?

Answer 7

Hornfels (non-foliated, fine grained)

Question 8

A low pressure aluminosilicate stable at conditons less than 4Kbar or 11km depth

Answer 8

Andalusite

Question 9

High T aluminosilicate polymoryph common at temp above 525 deg cel?

Answer 9

Sillimanite

Question 10

This is a high pressure aluminosilicate polymorph commonly occuring with paragonite?

Answer 10

Kyanite

Question 11

IN what P and T conditions will the triple junction or eutectic point of aluminosilicates occur?

Answer 11

510 deg cel at 3.8 kbar

Question 12

Mineral which occur with andalusite at low P

Answer 12

Cordierite

Question 13

minerals stable at moderate to high P envi?

Answer 13

Staurolite and Chloritoid

Question 14

Garnet mineral stable at moderate temp

Answer 14

Almandine

Question 15

Protliths which contain high conc of SiO2, Na2O, and K2O with low conc of FeO and MgO?

Answer 15

Quartzofeldsphatic or psammitic

Question 16

Common Psammitic protoliths?

Answer 16

Quartz arenite
arkose
graywacke
quartz conglo
granite
granodiorite
rhyolite

Question 17

Rocks produced form quartzofeldspahtic protoliths?

Answer 17

Metaquartzite
Silicic gneiss
migmatite
granulite

Question 18

High pressur silica polymorph

Answer 18

Coesite

Question 19

These indludes carbonate sed rocks such as limestone and dolostone

Answer 19

Calcareous Protoliths

Question 20

Met rocks formed from calcareous protolith especially calcite and dolomite

Answer 20

Marble and Skarn

Question 21

This met rocks are formed from contact metamorphism of carbonate rocks

Answer 21

Skarn

Question 22

Mineral assemblage of skarn

Answer 22

Wollastonite, tremolite, garnet (Grossular, Spess, Andradite)

Question 23

These includes ignqous rocks enrinched in MgO, FeO and CaO and depleted in SiO2, Na2O and K2O

Answer 23

Intermediate to Basic Rocks

Question 24

Common intermediate to basic protoliths?

Answer 24

Basalt, Andesite, Diorite, gabbro

Question 25

Low temp Low pressure mineral assemablage of met rocks from mafic protlith

Answer 25

chlorite chrysotile Zeolite Pumpellyite epidote

Question 26

Low temp high pressure mineral assemblage of met rocks from mafic protoliths?

Answer 26

Glaucophane lawsonite jadeite crossite riebeckite

Question 27

Common met rocks from intermediate to basic protoliths?

Answer 27

Amphibolite Eclogte Blueschist Greenschist Greenstone Serpentinite

Question 28

These are protoliths which are enriched in MgO, FeO, CaO, Ni and Cr and strongly depleted in Silica Alkali

Answer 28

Ultrabasic/Ultramafic

Question 29

Ultrabasic protoliths

Answer 29

Pyroxenites, dunites, and peridotites

Question 30

Low temp/ low pressure minerals for ultramafic protoliths?

Answer 30

Epidote pumpellyite zeolite serpentine Prehnite talc

Question 31

High temp mineral indicator/

Answer 31

pyroxenes jadeite Aegerine

Question 32

Mod to high pressure and temp garnet

Answer 32

Pyrope

Question 33

Pyroxene which forms at high T and very high P

Answer 33

Omphacite

Question 34

Common met rocks derived from ultramafics?

Answer 34

Amphibolite, serpentinite, Soapstone (talc schist/Steatite) and eclogite

Question 35

What are ultrabasic met rocks valued for?

Answer 35

Metallic Ore deposits

Question 36

Industrial commodity valued for its resistance to heat and friction, durability, flecibility, resitsnace to acids and strong interlocking fabric

Answer 36

Asbestos

Question 37

What are asbestiform minerals?

Answer 37

Filiform minerals L: >5 um D: <5 um L:W ratio of 3:1 (Filiform)

Question 38

L:W Ratio of Fibrous Minerals

Answer 38

10:01

Question 39

Two types of asbestiform mineral

Answer 39

Serpentine Mineral Group Amphibole Mienral group

Question 40

White asbestos which is widely (95%) used due to its soft, curly and flexible characteristics

Answer 40

Chyrsotile

Question 41

What makes amphibole asbesos not suitable for industrial use?

Answer 41

Hard and brittle

Question 42

Blue Asbestos

Answer 42

Crocidolite (variety of riebeckite)

Question 43

Brown Asbestos

Answer 43

Amosite (variety of grunerite)

Question 44

Other amphiboles used as asbestos

Answer 44

Anthophyllite Actinolite tremolite

Question 45

disease whereby lung tissue encapsulates asbestos particles which causes it to harden and limit essential O2/CO2 exchange

Answer 45

Asbestosis

Question 46

A rare disease of the lining of the lung and stomach caused by asbestos?

Answer 46

Mesothelioma

Question 47

Safe type of asbestos?

Answer 47

Chrysotile

Question 48

How long does chrysotile asbestos decompose in the lungs

Answer 48

9months

Question 49

Pelites

Answer 49

Staurolite Chloritoid Tourmaline Paragonite Corundum

Question 50

Psammitic

Answer 50

Aegerine Stilpnomelane

Question 51

Calcareous

Answer 51

Dolomite Aragonite Idiocrase Wollastonite Anorthite

Question 52

Intermediate to Basic

Answer 52

Sphene Jadeite Glaucophane Riebeckite Hornblende Prehnite Apatite

Question 53

Ultrabasic

Answer 53

Amosite - Grunerite Anthophyllite Antigorite Crocidolite Cummingtonite Chyrsotile Chromite