Mathematics – Logic
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92...11p&link_type=abstract
Earth and Planetary Science Letters, Volume 92, Issue 1, p. 11-26.
Mathematics
Logic
145
Scientific paper
We have measured the Sr concentration and isotopic composition of most of the world's major rivers. These data greatly extend the range of geologic, tectonic and climatic drainage basin environments that have been studied and, overall, constitute a doubling of the fluvial Sr isotope data base. This has produced a more accurate estimate for the 87Sr/86Sr ratio of global runoff of 0.7119; this is distinctly higher than obtained from previous studies. We have also determined the Sr concentration and 87Sr/86Sr ratio of oceanic hydrothermal vent waters from diverse tectonic and volcanogenic environments that have allowed us to further constraint the Sr isotope systematic of this source. These new data have been combined with previously published riverine data and values for the diagenetic benthic flux of Sr from deep-sea sediments to obtain a contemporary oceanic Sr isotope budget. The results of steady-state calculations give a best estimate for the flux of seawater through high-temperature ridge crest hydrothermal system of 1.2 +/- 0.3 × 1014 kg/yr; this is substantially higher than recent estimates.
Edmond John M.
Palmer Martin R.
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