Spivack, Arthur J; You, Chen-Feng (1997): Boron isotopic ratios and concentrations of pore fluids and carbonates from ODP Site 138-851 (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712086, Supplement to: Spivack, AJ; You, C-F (1997): Boron isotopic geochemistry of carbonates and pore waters, Ocean Drilling Program Site 851. Earth and Planetary Science Letters, 152(1-4), 113-122, https://doi.org/10.1016/S0012-821X(97)00134-9
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Abstract:
We have determined the boron content and isotopic composition of bulk carbonates and associated pore waters from Ocean Drilling Program Site 851. The delta11B of the carbonates range from 23 per mil to as low as -5.5 per mil, greatly extending the range of reported carbonate delta11B values. In contrast, pore fluid isotopic compositions are relatively constant. Based on the correlation of delta11B 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 delta11B of 23 per mil) and a recrystallized component (~2.5 ppm with delta11B of -5.5 per mil). 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.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 2.770283 * Longitude: -110.571633
Date/Time Start: 1991-06-16T00:00:00 * Date/Time End: 1991-06-21T00:00:00
Minimum DEPTH, sediment/rock: 1.4 m * Maximum DEPTH, sediment/rock: 317.0 m
Event(s):
138-851 * Latitude: 2.770283 * Longitude: -110.571633 * Date/Time Start: 1991-06-16T00:00:00 * Date/Time End: 1991-06-21T00:00:00 * Elevation: -3760.3 m * Penetration: 799.9 m * Recovery: 797.9 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 86 cores; 797.4 m cored; 0 m drilled; 100.1% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Boron | B | µmol/l | Spivack, Arthur J | Colorimetry | Pore fluids |
| 3 | δ11B | δ11B | ‰ SRM | Spivack, Arthur J | Negative-thermal ionization mass spectrometry (N-TIMS) | Pore fluids |
| 4 | δ11B | δ11B | ‰ SRM | Spivack, Arthur J | Negative-thermal ionization mass spectrometry (N-TIMS) | Carbonates |
| 5 | Boron | B | mg/kg | Spivack, Arthur J | Isotope dilution | Carbonates |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
37 data points