Computer Science
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53...41k&link_type=abstract
Earth and Planetary Science Letters, Volume 53, Issue 1, p. 41-54.
Computer Science
73
Scientific paper
We have determined the concentrations and isotopic composition of helium in oceanic basaltic glass both by melting and by crushing in vacuo. A significant fraction of the helium is released by crushing, confirming that it resides within the vesicles. Comparison of volume percent vesicles to the fraction of helium contained in the vesicles gives qualitative agreement with experimental gas-melt partitioning studies. Measured concentrations are therefore, a function of original helium content, magmatic history, vesicle size and quantity, and grain size analyzed. Helium released by crushing is isotopically indistinguishable from that contained in the glass. Diffusion rates for helium in basaltic glass (in the temperature range 125-400°C) determined using the method of stepwise heating, yielded an activation energy of 19.9 +/- 1 kcal/mole and ln D0 = -2.7 +/- 0.6 (cgs units). Extrapolation of these results to ocean floor temperatures (0°C) gives a diffusivity of 1.0 +/- 0.6 × 10-17 cm2/s, indicating that diffusion is an insignificant mechanism for helium loss from fresh basaltic glasses. The 3He/4He ratios are remarkably constant (at 1.10 +/- 0.03 × 10-5) for samples from the Mid-Atlantic Ridge (FAMOUS area and 23°N), the Juan de Fuca Ridge, the Galapagos spreading center, the Mid-Cayman Rise, and the Central Indian Ocean Ridge. This result is interpreted in terms of similar geochemical histories within the source regions for these samples.
Jenkins William J.
Kurz Mark D.
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