CIPW {GCDkit}R Documentation

CIPW norm

Description

Calculates various modifications of the CIPW norm.

Usage

CIPW(WR, precision = getOption("gcd.digits"), normsum = 
FALSE, cancrinite = FALSE, spinel = FALSE)

CIPWhb(WR, precision = getOption("gcd.digits"), normsum = FALSE,
cancrinite = FALSE, spinel = FALSE) 

Arguments

WR

a numerical matrix; the whole-rock data to be normalized.

precision

precision of the result.

normsum

logical; shall be the normative minerals recast to 100 %?

cancrinite

logical; is cancrinite present/to be calculated?

spinel

logical; is spinel to be calculated (for ultrabasic rocks, i.e. for samples with SiO2 < 45 % only)?

Details

The method adopted for 'classic' CIPW norm calculation is that of Hutchison (1974, 1975). The function 'CIPWHB' is its modification with biotite and hornblende (Hutchison 1975).

Normative minerals of the standard CIPW norm

Parameter

Full name

Formula

Molecular weight

Q

Quartz

SiO2

60.08

C

Corundum

Al2O3

101.96

Or

Orthoclase

K2O.Al2O3.6SiO2

556.64

Ab

Albite

Na2O.Al2O3.6SiO2

524.42

An

Anorthite

CaO.Al2O3.2SiO2

278.20

Lc

Leucite

K2O.Al2O3.4SiO2

436.48

Ne

Nepheline

Na2O.Al2O3.2SiO2

284.10

Kp

Kaliophilite

K2O.Al2O3.2SiO2

316.32

Nc

Sodium carbonate

Na2O.CO2

105.99

Ac

Acmite

Na2O.Fe2O3.4SiO2

461.99

Ns

Sodium metasilicate

Na2O.SiO2

122.06

Ks

Potassium metasilicate

K2O.SiO2

154.28

Di

Diopside

\(MgDi\)

\(Mg-diopside\)

CaO.MgO.2SiO2

216.55

\(FeDi\)

\(Fe-diopside\)

CaO.FeO.2SiO2

248.09

Wo

Wollastonite

CaO.SiO2

116.16

Hy

Hypersthene

\(En\)

\(Enstatite\)

MgO.SiO2

100.39

\(Fs\)

\(Ferrosillite\)

FeO.SiO2

131.93

Ol

Olivine

\(Fo\)

\(Forsterite\)

2MgO.SiO2

140.70

\(Fa\)

\(Fayalite\)

2FeO.SiO2

203.78

Cs

Dicalcium silicate

2CaO.SiO2

172.24

Mt

Magnetite

FeO.Fe2O3

231.54

Il

Ilmenite

FeO.TiO2

151.75

Hm

Hematite

Fe2O3

159.69

Tn

Sphene

CaO.TiO2.SiO2

196.06

Pf

Perovskite

CaO.TiO2

135.98

Ru

Rutile

TiO2

79.90

Ap

Apatite

3CaO.P2O5.1/3CaF2

336.21

Fr

Fluorite

CaF2

78.08

Pr

Pyrite

FeS2

119.98

Sp

Spinel

\(MgSp\)

\(Mg-spinel; spinel s. s.\)

CaO.MgO.2SiO2

142.27

\(FeSp\)

\(Fe-spinel; hercynite\)

CaO.FeO.2SiO2

173.81

Cc

Calcite

CaO.CO2

100.09

Additional minerals of the modification with hornblende and biotite

Parameter

Full name

Formula

Molecular weight

Bi

Biotite

\(MgBi\)

\(Phlogopite\)

KO0.5 3MgO AlO1.5 3SiO2

798.50

\(FeBi\)

\(Annite\)

KO0.5 3FeO AlO1.5 3SiO2

987.74

Ho

Hornblende

Act

Actinolite

\(MgAct\)

\(Tremolite\)

2CaO 5MgO 8SiO2

794.35

\(FeAct\)

\(Ferroactinolite\)

2CaO 5FeO 8SiO2

952.05

Ed

Edenite

\(MgEd\)

\(Edenite\)

NaO0.5 2CaO 5MgO AlO1.5 7SiO2

1632.48

\(FeEd\)

\(Ferroedenite\)

NaO0.5 2CaO 5FeO AlO1.5 7SiO2

1947.88

Ri

Riebeckite

2NaO0.5 2FeO1.5 3FeO 8SiO2

917.87

Value

A numeric matrix 'results'.

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

References

Hutchison C S (1974) Laboratory Handbook of Petrographic Techniques. John Wiley & Sons, New York, p. 1-527

Hutchison C S (1975) The norm, its variations, their calculation and relationships. Schweiz Mineral Petrogr Mitt 55: 243-256


[Package GCDkit version 3.00 Index]