This chapter presents several less known (or newly designed) types of geochemical plots that are implemented in GCDkit. It does not aim at being systematic and comprehensive; instead it focuses on arguably the most useful or interesting among them that could be suitable for common applications in igneous geochemistry. These include log–log binary plots (for discussing ratios), spiderplots colour coded according some independent variables (such as silica), double-normalized spiderplots (stripping effects of fractional crystallization from a source-related variation produced by partial melting), spider boxplots and spider box and percentile plots (good to deal with large and/or noisy trace-element data sets), contour plots (serving to spot maxima in data distributions), anomaly plots (appropriate, for instance, for mineral exploration) and stripplots/strip boxplots (illustrating the variability in small datasets).
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