Abstract
The 1993 volcanic/hydrothermal event on the CoAxial segment, northern Juan de Fuca Ridge, generated a complex set of event plumes and steady‐state type plumes with a pattern of ³He/heat ratios very similar to that observed during the 1986 megaplume event on the southern JdFR. The event plumes residing ∼600 m above the seafloor had “normal” ³He/heat ratios averaging 0.34 × 10−12 cm³STP cal−1, while the deeper, steady‐state plumes had elevated ³He/heat values ranging from 0.6 to 4.5 × 10−12 cm³STP cal−1. These results generally confirm that elevated ³He/heat ratios in some of the water‐column plumes are a reliable indicator of a recent magmatic/tectonic event. However, in contrast to the 1986 JdFR event, there was no evidence for hydrothermal activity on the CoAxial segment prior to 1993, thereby requiring revision of our models for event plume generation.
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