https://www2.tulane.edu/~sanelson/eens212/triangular_plots_metamophic_petrology.htm
Geochemical analysis for major oxide is important in metamorphic rocks and magmatic rocks for several reasons. Firstly, major element data in geochemistry are used in rock classification, in plotting variation diagrams, and in plotting diagrams in which the rock chemistry is shown together with the results of experimentally determined data. This is particularly useful in metamorphic rocks and magmatic rocks, as the major element composition of these rocks can provide valuable information about the source and differentiation processes, the physical properties that allow it to erupt, and its eruptive style.
Secondly, the main approaches to major element rock classification in igneous and sedimentary rocks include the use of oxide-oxide plots, the calculated normative mineralogy, and the rock composition recast as cations. These methods can help to identify the types of minerals present in the rocks and their relative proportions, which is important for understanding the formation and evolution of the rocks.
Thirdly, binary and ternary variation diagrams are widely used to display geochemical data, and a major part of the interpretation of geochemical data is the identification and replication, through modeling, of trends on these diagrams. This can help to identify patterns and trends in the data, which can provide insights into the processes that have occurred during the formation and evolution of the rocks.
Finally, the wealth of experimental data on igneous rocks means that natural rock compositions may be compared with experimental data gathered at particular pressures and temperatures to understand melting and fractionation processes in the Earth’s mafic and felsic crusts and mantle1. This can help to understand the conditions under which the rocks formed and the processes that occurred during their formation.
I hope this may help.
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