Computer Science
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.152..113s&link_type=abstract
Earth and Planetary Science Letters, vol. 152, Issue 1-4, pp.113-122
Computer Science
8
Boron, Carbonates, Pore Water, Odp Site 851, Geochemistry
Scientific paper
We have determined the boron content and isotopic composition of bulk carbonates and associated pore waters from Ocean Drilling Program Site 851. The 11 B of the carbonates range from 23 to as low as -5.5 , greatly extending the range of reported carbonate 11 B values. In contrast, pore fluid isotopic compositions are relatively constant. Based on the correlation of 11 B and 1/B (r=0.99) we conclude that the bulk carbonate at this site is a mixture of a biogenic component (~7 ppm with 11 B of 23 ) and a recrystallized component (~2.5 ppm with 11 B of -5.5 ). The empirical `low pH' water-carbonate fractionation factor implied by the data is 0.959±0.003. A boron concentration minimum occurs in pore waters at a depth of approximately 200 m below the seafloor and this is interpreted as reflecting essentially quantitative uptake of B at this depth and the horizontal advection of pore fluids with water residence times below the minimum on the order of 3,600 years.
Spivack Arthur J.
You Chen-Feng
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