Other
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..55..229a&link_type=abstract
Earth and Planetary Science Letters, Volume 55, Issue 2, p. 229-236.
Other
61
Scientific paper
87Sr/86Sr ratios of three hydrothermal waters collected on the East Pacific Rise at 21°N define a mixing line between seawater and a hydrothermal end-member at 0.7030 which is derived by seawater-basalt interaction at ca. 350°C and water/rock ratio of about 1.5. Sr concentrations are not affected in the process while Mg uptake from seawater is almost complete. Up to 2/3 of this hydrothermal component is involved in anhydrite precipitation while the Sr isotopic ratio in sulfides (chalcopyrite + sphalerite) cannot be distinguished from that of sulfate. It is estimated that ca. 1 × 1010 moles of strontium are yearly cycled in the hydrothermal systems of mid-oceanic ridges, thereby affecting the 87Sr/86Sr budget of seawater. Mass balance between river runoff, limestone precipitation and ridge basalt alteration suggests that the 87Sr/86Sr ratios of the river runoff are in the range 0.7097-0.7113, and are largely dominated by limestone alteration.
Albarède Francis
Michard Annie
Michard Gil
Minster Jean-François
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