Helium-3 from the mantle - Primordial signal or cosmic dust?

Details Helium-3 from the mantle - Primordial signal or cosmic dust? Helium-3 from the mantle - Primordial signal or cosmic dust?

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...261..170a&link_type=abstract

Science (ISSN 0036-8075), vol. 261, no. 5118, p. 170-176.

Computer Science

46

Earth Mantle, Helium, Magma, Planetary Composition, Chemical Composition, Degassing, Interplanetary Dust, Subduction (Geology)

Scientific paper

Helium-3 in hotspot magmas has been used as unambiguous evidence for the existence of a primordial, undegassed reservoir deep in the Earth's mantle. However, a large amount of helium-3 is delivered to the Earth's surface by interplanetary dust particles (IDPs). Recycling of deep-sea sediments containing these particles to the mantle, and eventual incorporation in magma, can explain the high helium-3/helium-4 ratios of hotspot magmas. Basalts with high helium-3/helium-4 ratios may represent degassing of helium introduced by ancient (probably 1.5 to 2.0 billion years old) pelagic sediments rather than degassing of primordial lower mantle material brought to the surface in plumes. Influx of IDPs can also explain the neon and siderophile compositions of mantle samples.

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