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Filtering by: Creator Graham, David W. Decade 1990-1999

Helium isotope variations in Juan de Fuca ridge basalts

Creator:

Lupton, John E., Graham, David W., Delaney, John R., and Johnson, H. Paul

Abstract:

We have measured ³He/⁴He ratios and He and Ne concentrations on a suite of 24 basalt glasses from the neovolcanic zone of the Juan de Fuca Ridge (JdFR) from 44.6°N near the Blanco Transform up to 48.0°N on the Endeavour Segment. The helium isotope ratios exhibit a clear geographic variation,...

Resource Type:

Article
Age constraints on crustal recycling to the mantle beneath the southern Chile Ridge: He-Pb-Sr-Nd isotope systematics

Creator:

Sturm, Marnie E., Klein, Emily M., Graham, David W., and Karsten, Jill

Abstract:

Basalts from the four southernmost segments of the subducting Chile Ridge (numbered 1-4 stepping away from the trench) display large variations in Sr, Nd, Pb, and He isotope and trace element compositions. Klein and Karsten [1995] showed that segments 1 and 3 display clear trace element evidence for recycled material...

Resource Type:

Article