The importance of noble gases in the Earth and Planetary sciences has been excellently explained in two previous volumes of the Geochemical Perspectives series by Manuel Moreira and Bernard Marty (Moreira, 2013; Marty, 2020). As Manuel explains, they are geochemical tracers par excellence because they are chemically (almost) inert and thus unaltered by chemical and biological reactions. They are also exceedingly rare in planetary environments, hence tiny additions from a wide variety of processes can be recognised much more easily than for other elements. As Bernard explains, noble gases are also important for understanding the geochemical cycles...
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