Other
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..155l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 2, p. 155-158
Other
19
Heat Flux, Helium Isotopes, Hydrothermal Systems, Mid-Ocean Ridges, Ocean Bottom, Pacific Ocean, Volcanoes, Plumes, Ratios, Variations, Water
Scientific paper
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 He-3/heat ratios very similar to that observed during the 1986 megaplume event on the southern JdFR. The event plumes residing approx. 600 m above the seafloor had 'normal' He-3/heat ratios averaging 0.34 x 10(exp -12) cu cm STP/cal, while the deeper, steady-state plumes had elevated He-3/heat values ranging from 0.6 to 4.5 x 10(exp -12) cu cm STP/cal. These results generally confirm that elevated He-3/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.
Baker Thomas E.
Burd Brenda J.
Butterfield David A.
Cannon Glenn A.
Embley Robert W.
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