Noble gases in submarine glasses from mid-oceanic ridges and Loihi seamount - Constraints on the early history of the earth

Details Noble gases in submarine glasses from mid-oceanic ridges and Loihi seamount - Constraints on the early history of the earth Noble gases in submarine glasses from mid-oceanic ridges and Loihi seamount - Constraints on the early history of the earth

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1301h&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 3, March 1992, p. 1301-1316.

Other

33

Geochemistry, Obsidian Glass, Ocean Bottom, Rare Gases, Seamounts, Basalt, Earth Mantle, Mass Spectroscopy, Primitive Earth Atmosphere

Scientific paper

Noble gas compositions in submarine glasses from midoceanic ridges and from Loihi seamount were analyzed. Rather uniform He-/He-4 ratios and Ar-40/Ar-36 ratios varying from nearly the atmospheric ratio to 15,200 were found in MORB samples along with positively correlated anomalies of excess Xe-129 and fissiogenic xenon. Isotopic anomalies of neon, including high Ne-20/Ne-22 ratios of up to about 13 and high Ne-21/Ne-22 of up to about 0.06 were observed in MORB samples. The latter ratio can be explained by nuclear reactions operating in the mantle while the former cannot. High Ne-20/Ne-22 ratio of up to 11.74 and slightly high Ne-21/Ne-22 ratio of up to 0.034 were found in some Loihi samples. These findings strongly suggest the existence of a solar-type neon in the whole mantle and that neon isotopic composition in the present atmosphere and the mantle differ from each other. This appears to contradict the prevailing idea that the present atmosphere was simply derived from the solid earth after its formation.

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