Igneous And Metamorphic Petrology Exam 1

Front 1

What is the chemical equation for fayalite?

Back 1

Fe2SiO4

Front 2

What is the chemical equation for hedenbergite?

Back 2

CaFeSi2O6

Front 3

What is the chemical equation for orthoclase?

Back 3

KAlSi3O8

Front 4

What is the chemical equation for grossular?

Back 4

Ca3Al2(SiO4)3

Front 5

A igneous rock with low Na2O + K2O relative to SiO2 and high FeO relative to MgO and Na2O + K2O is classified as?

Back 5

theoleiitic

Front 6

A igneous rock with high Na2O + K2O relative to SiO2 and low FeO relative to MgO and Na2O + K2O is classified as?

Back 6

alkaline

Front 7

Magma series that are characteristic of subduction zones are?

Back 7

calc-alkaline

Front 8

In the CIPW norma calculation P2O5 is assigned to a specific mineral. What is the name of this specific mineral and what is its chemical formula?

Back 8

Apatite Ca5(PO4)3(OH,F,Cl)

Front 9

Give the allocations of the following oxide groups in a CIPW norm calculation SiO2, TiO2, Al2O3, FeO, MgO, CaO, Na2O, and K2O

Back 9

SiO2->feldspar,pyroxens, olivine
TiO2->ilmenite
Al2O3->Feldspar
FeO->iron oxides, pyroxenes, and olivine
MgO->Olivine
CaO->anorthite and pyroxene
Na2O->albite
K2O->orthoclase

Front 10

In a CIPW norm calculation a deficiency of silica is rectified by converting hypersthen to olivine. What is the chemical equation?

Back 10

2(Mg,Fe)SiO3 = (Mg,Fe)2SiO4 + SiO2

2Hy = OL + QTZ

Front 11

What pairs of minerals never occur in a CIPW norm calculation?

Back 11

quartz and olivine

Front 12

On a p-t diagram show the phase relationship in a unary system Al2SiO5. Use the diagram to illustrate Gibbs Phase rule and how the term divariant, univariant, and invariant apply to the system.

Back 12

Front 13

what is the name when you have silica understaturation in your cipw norm calculation?

Back 13

nepheline normative

Front 14

what is the name when you have silica saturation in your cipw norm calculation?

Back 14

Hypersthene normative

Front 15

what is the name when you have silica overstaturation in your cipw norm calculation?

Back 15

Quartz normative

Front 16

Label the different magma series on a AFM diagram.

Back 16

Front 17

What kind of magmas are associate with Mid-Ocean Ridges?

Back 17

tholeiitic magma

Front 18

What kind of magmas are associated with subduction zones?

Back 18

calc-alkaline mamgmas

Front 19

What kind of mamgas are associated with hot spots?

Back 19

alkaline magmas

Front 20

What effect does H2O have on polymerization of silicate melt structure and why?

Back 20

decrease polymerization since the polymerization is the ratio of network modifies to network constituents. H2O breaks up the silicate chain motif.

Front 21

Compared to a volatile free system, what effects does H2O and CO2 have on a phase relatiohip(crystallization and melting) and on the physical properties of the magma.

Back 21

H2O causes magma to be less viscous and lower melting temp. Moves eutectic to higher SiO2 content,
CO2 raises the melting temp and moves eutectic to alkali Ne. Water pressure causes oscillitory zoning. Lowers liquidus and solidus and lowers crystallization temp as well.

Front 22

Classify Ultramafic

Back 22

<45 SiO2, peridotite and dunite, ol op cpx gt

Front 23

Classify Mafic

Back 23

45-55 SiO2, Basalt and gabbro, ol op cpx plg

Front 24

Classify intermediate

Back 24

55-65 SiO2, andesite and diorite, plg px amp qz

Front 25

Classify silic

Back 25

65-75 SiO2, ryolite and granite, qz fsp mica