Helium-4 makes up about one quarter of the ordinary matter in the universe by mass, with almost all of the rest being hydrogen. While nuclear fusion in stars also produces helium-4, most of the helium-4 in the Sun and in the universe is thought to have been produced during the Big Bang, known as " primordial helium".

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Helium (2 He) (standard atomic weight: 4.002 602(2)) has nine known isotopes, but only helium-3 (3 He) and helium-4 (4 He) are stable. [4] . All radioisotopes are short-lived; the longest-lived is 6 He with half-life 806.92 (24) milliseconds.

Feb 6, 2017 · We interpret the relationships between 3He/4He values, hotspot buoyancy flux, and upper-mantle shear wave velocity to mean that hot plumes—which exhibit seismic low-velocity anomalies at depths...

Oct 18, 2023 · Here we report the highest magmatic 3He/4He ratio (67.2 ± 1.8 times the atmospheric ratio) yet measured in terrestrial igneous rocks, in olivines from Baffin Island lavas.

Jun 17, 2020 · We compare the 3He/4He signature of volcanic gases and fluid inclusions and we highlight analogous evolution of the 3He/4He signature in both during the last decades of eruptive activity...

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Earth's inventory of helium consists of two stable isotopes, the more abundant 4He and the far more rare 3He. Unlike terrestrial 4He, which is mainly produced by decay of uranium and thorium, terrestrial 3He is largely of primordial origin, synthesized in the aftermath of the Big Bang (Bania et al., 2002) and incorporated into the Earth ...

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