In this section, I present a brief overview of the history of the helium geochemistry in the mantle. Its interpretations will be discussed in Sections 6 and 8, in the context of the systematics of all noble gases in the Earth’s mantle.

Helium has only two stable isotopes, 3He and 4He. While 3He is considered as primordial, 4He is mostly radiogenic in the mantle and almost entirely of radiogenic origin in the continental crust. 4He is produced from the decay of U, Th, and (less significantly) Sm. Although helium is the second most abundant element...

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