TITLE:
NORRRM: A Free Software to Calculate the CIPW Norm
AUTHORS:
Reneé González-Guzmán
KEYWORDS:
Igneous Petrology, CIPW Norm, Fe Oxidation Ratio, Free Software
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.1,
January
28,
2016
ABSTRACT: This work gives an
introduction to the R package NORRRM whose main purpose is to calculate the
CIPW Norm. Although there are many softwares and spreadsheets available to
estimate the standard mineral assemblages in igneous rocks, this package has
the following advantages: a) it has the ability to be run on any operating
computer systems (BSD, GNU/Linux, Mac OS X®, Windows®);
b) an input argument allows choose different procedures to set the Fe-oxidation
ratio; c) the options to use whole-rock major as well as minor oxides and trace
elements in the computation; d) the output data yields highly consistent
results achieving absolute match between the sum of the input weights of oxides
recalculated on an anhydrous basis and the sum of the weights of estimated
normative minerals and; e) the functions are written in R language and released
under terms that guarantee users the freedom to study, adapt, modify, and
distribute the software.