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Science 9 July 1993:
Vol. 261. no. 5118, pp. 170 - 176
DOI: 10.1126/science.261.5118.170
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Articles
Helium-3 from the Mantle: Primordial Signal or Cosmic Dust?
Don L. Anderson 1
1 Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125
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. Basafts 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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- Osmium-187 Enrichment in Some Plumes: Evidence for Core-Mantle Interaction?.
- R. J. Walker, R. J. Walker, J. W. Morgan, and M. F. Horan (1995)
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269, 819-822
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- Primitive Boron Isotope Composition of the Mantle.
- M. Chaussidon, M. Chaussidon, and B. Marty (1995)
Science
269, 383-386
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- Retention of Helium in Subducted Interplanetary Dust Particles.
- H. Craig and H. Craig (1994)
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265, 1892-1893
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- Retention of Solar Helium and Neon in IDPs in Deep Sea Sediment.
- H. Hiyagon and H. Hiyagon (1994)
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263, 1257-1259
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- Mantle Plume Helium in Submarine Basalts from the Galapagos Platform.
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262, 2023-2026
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- A Direct Measurement of the Terrestrial Mass Accretion Rate of Cosmic Dust.
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