Mathematics – Logic
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60...87j&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 60, Issue 1, p. 87-93.
Mathematics
Logic
4
Scientific paper
The helium isotopes composition of fluids trapped in hydrothermal Sulfides from the East Pacific Rise (13 °N) were measured. Two extraction techniques, i.e., crushing and heating, were tested and sulfldes of different mineralogical types were studied. The comparison between the two extraction methods suggests that both should give similar results, provided the crushing efficiency is sufficiently high. Sulfides 3He/4He ratio for crushed samples are in the range 6.85 8.10 times the atmospheric ratio (Ra = 1.38 × 10-6) and the measured helium concentration is of the order of 5.5 × 10-5 cm3 STP per gram of trapped fluid. Comparison with the helium isotope composition of the hydrothermal vent fluids themselves shows that the mineral phases formed at the highest temperature (i.e., with less dilution by the ambient seawater) retain the helium information most effectively, with values almost indistinguishable from the endmember vent fluid.
Fouquet Yves
Jean-Baptiste Ph.
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