Other
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..659k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 3, pp.659-668
Other
10
Scientific paper
The 210 Pb/Pb and 228 Ra/ 226 Ra ratios measured in fluids and particles venting from the Endeavour Ridge are used to constrain the crustal residence time of the converting hydrothermal fluid from the initiation of basalt alteration where Mg +2 loss from seawatcr results in rapidly falling pH conditions, to termination at seafloor venting. The 210 Pb/Pb ratios of hot, low Mg fluids are close to that of the basalts, suggesting a residence time of no greater than ten years. Particles associated with these vents have slightly higher ratios which may in part be due to scavenging of seawater 210 Pb. The 228 Ra/ 226 Ra ratios of the fluids and an associated Ba-rich particle sample were also close to the basalt ratio, futher constraining the residence time to 3 years or less. These estimates indicate that the mass of fluid interacting with newly formed crust at any one time is less than 9 × 10 13 kg. if the axial heat flux is to be no greater than 30% of the total advective heat loss from the oceanic crust.
Kadko David
Moore Willard
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