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Barnes, Jaime D; Paulick, Holger; Sharp, Zachary D; Bach, Wolfgang; Beaudoin, Georges (2009): Stable oxygen, hydrogene and chlorine isotopes of mid-Atlantic abyssal peridotites. PANGAEA, https://doi.org/10.1594/PANGAEA.734342, Supplement to: Barnes, JD et al. (2009): Stable isotope (d18 O, dD, d37 Cl) evidence for multiple fluid histories in mid-Atlantic abyssal peridotites (ODP Leg 209). Lithos, 110(1-4), 83-94, https://doi.org/10.1016/j.lithos.2008.12.004

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Abstract:
Serpentinized abyssal peridotites sampled by the Ocean Drilling Program Leg 209 along the mid-Atlantic Ridge near the 15°20'N Fracture Zone have been analyzed for oxygen, hydrogen, and chlorine isotope compositions in order to determine isotopic behavior under a wide range of serpentinization conditions and place constraints on fluid history. Oxygen and hydrogen thermometry suggests peak serpentinization temperatures of 300-500°C. Serpentine separates have low deltaD values possibly due to a magmatic fluid component or low-temperature exchange during seafloor weathering.
Chlorine geochemistry focused on three holes: 1274A and 1272A (serpentinized peridotites) and 1268A (serpentinite locally altered to talc). Concentrations of both, water-soluble chloride (WSC) and structurally bound chloride (SBC) are significantly lower at Hole 1268A compared to Holes 1274A and 1272A. The delta37Cl values for WSC and SBC of serpentinites in Holes 1274A and 1272A are slightly positive (avg. WSC = 0.20 per mil, n = 22 and avg. SBC = 0.35 per mil, n = 22), representing typical seawater-hydration conditions commonly determined for abyssal peridotite. The SBC of serpentinites from Hole 1268A are also positive (avg. = 0.63 per mil); whereas, the SBC in talc-dominated samples is negative (avg. = -1.22 per mil). The WSC of both talc- and serpentine-dominated samples are also negative (avg. = -0.15 per mil).
We interpret the chlorine isotope data to preserve a record of multiple fluid events. As seawater hydrated the peridotite, 37Cl was preferentially incorporated into the forming serpentine and water-soluble salts, yielding similar delta37Cl values on a regional scale as sampled by Holes 1268A, 1274A and 1272A. The resultant pore fluid was left depleted in 37Cl. Locally (Hole 1268A), this evolved fluid was remobilized possibly due to the initiation of hydrothermal circulation in response to emplacement of a mafic magma body. The low delta37Cl pore fluids attained elevated SiO2 and sulfur concentrations due to interaction with the gabbroic intrusion and, when ascending through the surrounding serpentinite, caused formation of isotopically negative talc. This secondary fluid also flushed the preserved serpentinite of its previously formed salts, resulting in negative delta37Cl WSC values. The delta37Cl SBC values of the serpentinite samples remained unmodified by reaction with the secondary fluid.
Project(s):
Coverage:
Median Latitude: 15.098908 * Median Longitude: -45.406241 * South-bound Latitude: 14.721080 * West-bound Longitude: -46.676360 * North-bound Latitude: 15.647780 * East-bound Longitude: -44.884730
Date/Time Start: 2003-05-22T05:45:00 * Date/Time End: 2003-06-18T21:45:00
Event(s):
209-1268A * Latitude: 14.845910 * Longitude: -45.077350 * Date/Time Start: 2003-05-22T05:45:00 * Date/Time End: 2003-05-26T19:30:00 * Elevation: -3007.0 m * Penetration: 147.6 m * Recovery: 78.69 m * Location: North Atlantic Ocean * Campaign: Leg209 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 147.6 m cored; 0 m drilled; 53.3 % recovery
209-1270A * Latitude: 14.722360 * Longitude: -44.888680 * Date/Time Start: 2003-05-28T22:00:00 * Date/Time End: 2003-05-29T16:00:00 * Elevation: -1951.0 m * Penetration: 26.9 m * Recovery: 3.28 m * Location: North Atlantic Ocean * Campaign: Leg209 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 26.9 m cored; 0 m drilled; 12.2 % recovery
209-1270B * Latitude: 14.721080 * Longitude: -44.887080 * Date/Time Start: 2003-05-29T16:00:00 * Date/Time End: 2003-05-31T12:00:00 * Elevation: -1909.9 m * Penetration: 45.9 m * Recovery: 17.17 m * Location: North Atlantic Ocean * Campaign: Leg209 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 45.9 m cored; 0 m drilled; 37.4 % recovery
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12 datasets

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Datasets listed in this publication series

  1. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 1) Mineralogy, geochemistry and isotopic ratios of peridotites from ODP Hole 209-1268A. https://doi.org/10.1594/PANGAEA.734246
  2. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 1) Mineralogy, geochemistry and isotopic ratios of peridotites from ODP Hole 209-1272A. https://doi.org/10.1594/PANGAEA.734247
  3. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 1) Mineralogy, geochemistry and isotopic ratios of peridotites from ODP Hole 209-1274A. https://doi.org/10.1594/PANGAEA.734248
  4. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 1) Mineralogy, geochemistry and isotopic ratios of peridotites from ODP Site 209-1270. https://doi.org/10.1594/PANGAEA.734252
  5. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 1) Mineralogy, geochemistry and isotopic ratios of peridotites from ODP Site 209-1271. https://doi.org/10.1594/PANGAEA.734250
  6. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 2) Cation concentrations in solutions obtained from leaching of serpentinites of ODP Hole 209-1268A. https://doi.org/10.1594/PANGAEA.734280
  7. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 2) Cation concentrations in solutions obtained from leaching of serpentinites of ODP Hole 209-1272A. https://doi.org/10.1594/PANGAEA.734282
  8. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 2) Cation concentrations in solutions obtained from leaching of serpentinites of ODP Hole 209-1274A. https://doi.org/10.1594/PANGAEA.734283
  9. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 3) Serpentine-magnetite thermometry for serpentinites from ODP Hole 209-1268A. https://doi.org/10.1594/PANGAEA.734270
  10. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 3) Serpentine-magnetite thermometry for serpentinites from ODP Hole 209-1270A. https://doi.org/10.1594/PANGAEA.734272
  11. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 3) Serpentine-magnetite thermometry for serpentinites from ODP Hole 209-1271A. https://doi.org/10.1594/PANGAEA.734273
  12. Barnes, JD; Paulick, H; Sharp, ZD et al. (2009): (Table 3) Serpentine-magnetite thermometry for serpentinites from ODP Hole 209-1274A. https://doi.org/10.1594/PANGAEA.734271