Abstract

The 3He/ 4He results of the Atlantic GEOSECS program are interpreted in terms of a simple mixing model which allows the contribution of the 3He-rich southern component of deep water to be separated from that of the 3He-poor northern component. The anomalies from the mixing line connecting these components reveal a 3He-rich zone over the Mid-Atlantic Ridge 16° south of the equator and one against the North American continental margin off New Jersey at about the same elevation. The origin of the latter feature remains a mystery.

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