The 3He distribution in deep water over the Mid-Atlantic Ridge

Details The 3He distribution in deep water over the Mid-Atlantic Ridge The 3He distribution in deep water over the Mid-Atlantic Ridge

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..371l&link_type=abstract

Earth and Planetary Science Letters, Volume 32, Issue 2, p. 371-374.

Physics

3

Scientific paper

3He/4He ratios in dissolved helium at GEOSECS stations 115, 117, 30, and 120 provide an east-west section across the Mid-Atlantic Ridge at 30°N. Below 1500 m depth, the 3He/4He profiles show little structure and have values within a few percent of the atmospheric ratio, indicating that the Mid-Atlantic Ridge is not a significant source of injected 3He at this latitude. Mean 3He/4He ratios calculated for the deep water at each station show that the 3He/4He ratio in the western Atlantic at 30°N is 2-3% higher than in the eastern basin, probably due to mixing between a 3He-rich boundary current in the western basin and low-3He deep water to the east.

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