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Clustering analysis of soil gas chemical ratios as a potential geochemical tool for surface geothermal exploration

The analysis of the soil atmosphere usually consists of determining the chemical and isotopic composition of the gases, including concentrations and molar ratios of multiple chemical species (e.g. He, H 2 , N 2 , Ar, Ne, O 2 , CH 4 , CO 2 ), as well as the C isotopic ratios ( 13 C/ 12 C). In practice a single geochemical survey provides tens of different parameters for each sampling point. Taking into account that a typical survey is composed of hundreds of sampling points, the huge amount of collected data requires effective data mining tools to perform analyses going beyond the simple mapping of concentrations and/or ratios and to detect hidden patterns in the dataset.