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GLE 2024 (Day 2) > METAMORPHIC PETROLOGY (PROTOLITH-BASED CLASSIFICATION) > Flashcards

METAMORPHIC PETROLOGY (PROTOLITH-BASED CLASSIFICATION) Flashcards

1
Q

These includes aluminum rich protoliths

A

Pelite protoliths

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2
Q

Main oxides in pelitic met rocks

A

SiO2, Al2O3, K2O

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3
Q

what are the protliths considered as pelite?

A

Shale
Mudstone
Altered volcanic tuff (Bentonite)

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4
Q

Minerals which are altered in pelithic protolith?

A

Clay (Kaolinite, Smectite, and Illite)

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5
Q

What are the resulting altered minerals which serves as Geothermobarometers?

A

Aluminosilicates

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6
Q

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

A

Slates, Phyllite and mica schist

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7
Q

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

A

Hornfels (non-foliated, fine grained)

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8
Q

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

A

Andalusite

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9
Q

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

A

Sillimanite

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10
Q

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

A

Kyanite

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11
Q

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

A

510 deg cel at 3.8 kbar

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12
Q

Mineral which occur with andalusite at low P

A

Cordierite

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13
Q

minerals stable at moderate to high P envi?

A

Staurolite and Chloritoid

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14
Q

Garnet mineral stable at moderate temp

A

Almandine

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15
Q

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

A

Quartzofeldsphatic or psammitic

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16
Q

Common Psammitic protoliths?

A

Quartz arenite
arkose
graywacke
quartz conglo
granite
granodiorite
rhyolite

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17
Q

Rocks produced form quartzofeldspahtic protoliths?

A

Metaquartzite
Silicic gneiss
migmatite
granulite

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18
Q

High pressur silica polymorph

A

Coesite

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19
Q

These indludes carbonate sed rocks such as limestone and dolostone

A

Calcareous Protoliths

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20
Q

Met rocks formed from calcareous protolith especially calcite and dolomite

A

Marble and Skarn

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21
Q

This met rocks are formed from contact metamorphism of carbonate rocks

A

Skarn

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22
Q

Mineral assemblage of skarn

A

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

23
Q

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

A

Intermediate to Basic Rocks

24
Q

Common intermediate to basic protoliths?

A

Basalt, Andesite, Diorite, gabbro

25
Q

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

A

chlorite
chrysotile
Zeolite
Pumpellyite
epidote

26
Q

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

A

Glaucophane
lawsonite
jadeite
crossite
riebeckite

27
Q

Common met rocks from intermediate to basic protoliths?

A

Amphibolite
Eclogte
Blueschist
Greenschist
Greenstone
Serpentinite

28
Q

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

A

Ultrabasic/Ultramafic

29
Q

Ultrabasic protoliths

A

Pyroxenites, dunites, and peridotites

30
Q

Low temp/ low pressure minerals for ultramafic protoliths?

A

Epidote
pumpellyite
zeolite
serpentine
Prehnite
talc

31
Q

High temp mineral indicator/

A

pyroxenes
jadeite
Aegerine

32
Q

Mod to high pressure and temp garnet

A

Pyrope

33
Q

Pyroxene which forms at high T and very high P

A

Omphacite

34
Q

Common met rocks derived from ultramafics?

A

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

35
Q

What are ultrabasic met rocks valued for?

A

Metallic Ore deposits

36
Q

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

A

Asbestos

37
Q

What are asbestiform minerals?

A

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

38
Q

L:W Ratio of Fibrous Minerals

A

10:01

39
Q

Two types of asbestiform mineral

A

Serpentine Mineral Group
Amphibole Mienral group

40
Q

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

A

Chyrsotile

41
Q

What makes amphibole asbesos not suitable for industrial use?

A

Hard and brittle

42
Q

Blue Asbestos

A

Crocidolite (variety of riebeckite)

43
Q

Brown Asbestos

A

Amosite (variety of grunerite)

44
Q

Other amphiboles used as asbestos

A

Anthophyllite
Actinolite
tremolite

45
Q

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

A

Asbestosis

46
Q

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

A

Mesothelioma

47
Q

Safe type of asbestos?

A

Chrysotile

48
Q

How long does chrysotile asbestos decompose in the lungs

A

9months

49
Q

Pelites

A

Staurolite
Chloritoid
Tourmaline
Paragonite
Corundum

50
Q

Psammitic

A

Aegerine
Stilpnomelane

51
Q

Calcareous

A

Dolomite
Aragonite
Idiocrase
Wollastonite
Anorthite

52
Q

Intermediate to Basic

A

Sphene
Jadeite
Glaucophane
Riebeckite
Hornblende
Prehnite
Apatite

53
Q

Ultrabasic

A

Amosite - Grunerite
Anthophyllite
Antigorite
Crocidolite
Cummingtonite
Chyrsotile
Chromite

GLE 2024 (Day 2) (41 decks)

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