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Barnes, Jaime D; Sharp, Zachary D (2006): Major ion concentrations and chlorine isotope composition of water-soluble chloride and structurally bound chloride in DSDP/ODP serpentinized ultramafic rocks [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.704766, Supplement to: Barnes, JD; Sharp, ZD (2006): A chlorine isotope study of DSDP/ODP serpentinized ultramafic rocks: Insights into the serpentinization process. Chemical Geology, 228(4), 246-265, https://doi.org/10.1016/j.chemgeo.2005.10.011

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Abstract:
Eight DSDP/ODP cores were analyzed for major ion concentrations and d37Cl values of water-soluble chloride (d37Clwsc) and structurally bound chloride (d37Clsbc) in serpentinized ultramafic rocks. This diverse set of cores spans a wide range in age, temperature of serpentinization, tectonic setting, and geographic location of drilled serpentinized oceanic crust. Three of the cores were sampled at closely spaced intervals to investigate downhole variation in Cl concentration and chlorine isotope composition.
The average total Cl content of all 86 samples is 0.26±0.16 wt.% (0.19±0.10 wt.% as water-soluble Cl (Xwsc) and 0.09±0.09 wt.% as structurally bound Cl (Xsbc)). Structurally bound Cl concentration nearly doubles with depth in all cores; there is no consistent trend in water-soluble Cl content among the cores. Chlorine isotope fractionation between the structurally bound Cl**- site and the water-soluble Cl**- site varies from -1.08‰ to +1.16‰, averaging to +0.21‰. Samples with negative fractionations may be related to reequilibration of the water-soluble chloride with seawater post-serpentinite formation. Six of the cores have positive bulk d37Cl values (+0.05‰ to +0.36‰); the other two cores (173-1068A (Leg-Hole) and 84-570) have negative bulk d37Cl values (-1.26‰ and -0.54‰). The cores with negative d37Cl values also have variable Cl**-/SO4**2- ratios, in contrast to all other cores. The isotopically positive cores (153-920D and 147-895E) show no isotopic variation with depth; the isotopically negative core (173-1068A) decreases by ~1‰ with depth for both the water-soluble and structurally bound Cl fractions.
Non-zero bulk d37Cl values indicate Cl in serpentinites was incorporated during original hydration and is not an artifact of seawater infiltration during drilling. Cores with positive d37Cl values are most likely explained by open system fractionation during hydrothermal alteration, with preferential incorporation of 37Cl from seawater into the serpentinite and loss of residual light Cl back to the ocean. Fluid / rock ratios were probably low as evidenced by the presence of water-soluble salts. The two isotopically negative cores are characterized by a thick overlying sedimentary package that was in place prior to serpentinization. We believe the low d37Cl values of these cores are a result of hydration of ultramafic rock by infiltrating aqueous pore fluids from the overlying sediments. The resulting serpentinites inherit the characteristic negative d37Cl values of the pore waters. Chlorine stable isotopes can be used to identify the source of the serpentinizing fluid and ultimately discern chemical and tectonic processes involved in serpentinization.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 24.598883 * Median Longitude: -48.091376 * South-bound Latitude: 2.279800 * West-bound Longitude: -101.446000 * North-bound Latitude: 40.682580 * East-bound Longitude: 12.756500
Date/Time Start: 1981-10-03T00:00:00 * Date/Time End: 1997-05-22T05:30:00
Event(s):
82-558 * Latitude: 37.770000 * Longitude: -37.343500 * Date/Time: 1981-10-03T00:00:00 * Elevation: -3754.0 m * Penetration: 561.5 m * Recovery: 237.8 m * Location: North Atlantic/RIDGE * Campaign: Leg82 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 394.5 m cored; 0 m drilled; 60.3 % recovery
84-566 * Latitude: 12.805700 * Longitude: -90.696500 * Date/Time: 1982-01-24T00:00:00 * Elevation: -3745.0 m * Penetration: 55.8 m * Recovery: 21.3 m * Location: North Pacific * Campaign: Leg84 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 55.8 m cored; 0 m drilled; 38.2 % recovery
84-570 * Latitude: 13.285300 * Longitude: -91.392800 * Date/Time: 1982-02-17T00:00:00 * Elevation: -1698.0 m * Penetration: 401.9 m * Recovery: 164.5 m * Location: North Pacific/SLOPE * Campaign: Leg84 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 382.6 m cored; 19.3 m drilled; 43 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
21 datasets

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Datasets listed in this publication series

  1. Barnes, JD; Sharp, ZD (2006): (Appendix 1) Major ion concentrations in water samples leached from serpentinized ultramafic rocks of ODP Site 107-651A. https://doi.org/10.1594/PANGAEA.704753
  2. Barnes, JD; Sharp, ZD (2006): (Appendix 1) Major ion concentrations in water samples leached from serpentinized ultramafic rocks of ODP Site 109-670A. https://doi.org/10.1594/PANGAEA.704754
  3. Barnes, JD; Sharp, ZD (2006): (Appendix 1) Major ion concentrations in water samples leached from serpentinized ultramafic rocks of ODP Site 147-895E. https://doi.org/10.1594/PANGAEA.704755
  4. Barnes, JD; Sharp, ZD (2006): (Appendix 1) Major ion concentrations in water samples leached from serpentinized ultramafic rocks of ODP Site 153-920D. https://doi.org/10.1594/PANGAEA.704756
  5. Barnes, JD; Sharp, ZD (2006): (Appendix 1) Major ion concentrations in water samples leached from serpentinized ultramafic rocks of ODP Site 173-1068A. https://doi.org/10.1594/PANGAEA.704757
  6. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from DSDP Site 558. https://doi.org/10.1594/PANGAEA.704721
  7. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from DSDP Site 566. https://doi.org/10.1594/PANGAEA.704722
  8. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from DSDP Site 570. https://doi.org/10.1594/PANGAEA.704723
  9. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from ODP Site 107-651A. https://doi.org/10.1594/PANGAEA.704716
  10. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from ODP Site 109-670A. https://doi.org/10.1594/PANGAEA.704717
  11. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from ODP Site 147-895E. https://doi.org/10.1594/PANGAEA.704718
  12. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from ODP Site 153-920D. https://doi.org/10.1594/PANGAEA.704719
  13. Barnes, JD; Sharp, ZD (2006): (Table 2) Contents of chloride components in serpentinized ultramafic rocks from ODP Site 173-1068A. https://doi.org/10.1594/PANGAEA.704720
  14. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from DSDP Site 558. https://doi.org/10.1594/PANGAEA.704748
  15. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from DSDP Site 566. https://doi.org/10.1594/PANGAEA.704749
  16. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from DSDP Site 570. https://doi.org/10.1594/PANGAEA.704750
  17. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from ODP Site 107-651A. https://doi.org/10.1594/PANGAEA.704743
  18. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from ODP Site 109-670A. https://doi.org/10.1594/PANGAEA.704744
  19. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from ODP Site 147-895E. https://doi.org/10.1594/PANGAEA.704745
  20. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from ODP Site 153-920D. https://doi.org/10.1594/PANGAEA.704746
  21. Barnes, JD; Sharp, ZD (2006): (Table 3) Chlorine stable isotope ratios of water-soluble (WSC) and structurally bound (SBC) fractions of chloride component in serpentinized ultramafic rocks from ODP Site 173-1068A. https://doi.org/10.1594/PANGAEA.704747