CIPW {GCDkit}R Documentation

CIPW norm

Description

Calculates various modifications of the CIPW norm.

Usage

CIPW(wrdata, precision = getOption("gcd.digits"), normsum = 
FALSE, cancrinite = FALSE, spinel = FALSE, complete.results = FALSE)

CIPWhb(wrdata, precision = getOption("gcd.digits"), normsum = FALSE,
cancrinite = FALSE, spinel = FALSE, complete.results = FALSE) 

Arguments

wrdata

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)?

complete.results

logical; should be returned more extensive list of minerals, including the end members making up Di, Hy, Ol, Bi and Hbl?

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
Dcs 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
Py 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
Hbl 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)

Vojtěch Janoušek, vojtech.janousek@geology.cz

References

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

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

Examples

    data(sazava)
    accessVar("sazava")
    
    CIPW(WR)

[Package GCDkit version 6.1 Index]