Mesonorm {GCDkit}R Documentation

Improved Mesonorm for granitoid rocks

Description

Calculates eine bessere Mesonorm for granitoids of Mielke & Winkler (1979).

Usage

Mesonorm(WR, GUI = FALSE, precision = getOption("gcd.digits"))

Streckeisen(x, new = TRUE)

Arguments

WR

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

GUI

logical, is the function called from the GUI?

precision

precision of the result.

x

Normative minerals calculated by the function Mesonorm.

new

logical, is a new plotting window to be opened?

Details

This method of norm calculation should yield mineral proportions close to the actual mode of granitoid rocks. The calculated minerals are:

Orthoclase, Albite, Anorthite, Quartz, Apatite, Magnetite, 
Hematite, Ilmenite, Biotite, Amphibole, Calcite, Corundum, 
Rest

If desired, the function plots Q'-ANOR diagram of Streckeisen & Le Maitre (1979) using the function Streckeisen. The fields in this diagram are labeled as follows:

2 alkali feldspar granite
3 granite
4 granodiorite
5 tonalite
6* quartz alkali feldspar syenite
7* quartz syenite
8* quartz monzonite
9* quartz monzodiorite/quartz monzogabbro
10* quartz diorite/quartz gabbro
6 alkali feldspar syenite
7 syenite
8 monzonite
9 monzodiorite/monzogabbro
10 diorite/gabbro

Value

A numeric matrix 'results'.

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

& Vojtech Erban, vojtech.erban@geology.cz

References

Mielke P & Winkler H G F (1979) Eine bessere Berechnung der Mesonorm fuer granitische Gesteine. Neu Jb Mineral, Mh 471-480

Streckeisen, A. & Le Maitre, R. W. (1979) A chemical approximation to the modal QAPF classification of the igneous rocks. Neu Jb Mineral, Abh 136, 169-206.


[Package GCDkit version 4.1 Index]