Solar neon in the Icelandic mantle: new evidence for an undegassed lower mantle

Details Solar neon in the Icelandic mantle: new evidence for an undegassed lower mantle Solar neon in the Icelandic mantle: new evidence for an undegassed lower mantle

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.185...15m&link_type=abstract

Earth and Planetary Science Letters, Volume 185, Issue 1-2, p. 15-23.

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32

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New helium and neon data from subglacial Icelandic basalts confirm that the Icelandic mantle source is relatively undegassed. The 3He/4He ratios vary between 14.3 and 25.6 times atmospheric (R/Ra) (4He/3He between 50500 and 28000); helium contents vary between 0.3 and 10 μcc STP/g. These values are consistent with the previously published data. The 20Ne contents are highly variable due to atmospheric contamination, and the 20Ne/22Ne ratios vary between atmospheric (9.8) and 12.73+/-0.04. The most important result comes from the observed 21Ne/22Ne ratios, which are much lower (at a given 20Ne/22Ne) than any other hotspot, despite the relatively low helium isotope ratios. The unique Icelandic helium-neon systematics, as compared to Hawaii, probably reflects different mixing processes related to the location of Iceland on the Mid Atlantic Ridge rather than in a mid-plate setting. If the isotopic variations are caused by mixing, the Icelandic plume end member has a 4He/3He lower than 19000 (R/Ra>38) and a 21Ne/22Ne ratio lower than 0.035. The 21Ne/22Ne ratio is very close to the solar neon isotope composition and indicates that the plume source has a very low (U+Th)/22Ne ratio that is best explained by a relatively undegassed mantle component.

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