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Kastner, Miriam; Elderfield, Henry; Martin, Jonathan B; Suess, Erwin; Kvenvolden, Keith A; Garrison, Robert E (1990): Chemistry of interstitial waters of ODP Leg 112 samples [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.753638, Supplement to: Kastner, M et al. (1990): Diagenesis and interstitial-water chemistry at the Peruvian continental margin - major constituents and strontium isotopes. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 413-440, https://doi.org/10.2973/odp.proc.sr.112.144.1990

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Abstract:
Two distinct hydrogeochemical regimes currently dominate the Peruvian continental margin. One, in shallower water (150-450 m) shelf to upper-slope regions, is characterized by interstitial waters with strong positive chloride gradients with depth. The maximum measured value of 1043 mM chloride at Site 680 at ITS corresponds to a degree of seawater evaporation of ~2 times. Major ion chemistry and strontioum isotopic composition of the interstitial waters suggest that a subsurface brine that has a marine origin and is of pre-early Miocene "age," profoundly influences the chemistry and diagenesis of this shelf environment. Site 684 at ~9°S must be closest to the source of this brine, which becomes diluted with seawater and/or interstitial water as it flows southward toward Site 686 at ~13 infinity S (and probably beyond) at a rate of approximately 3 to 4 cm/yr, since early Miocene time.
The other regime, in deep water (3000-5000 m) middle to lower-slope regions, is characterized by interstitial waters with steep negative and nonsteady-state chloride gradients with depth. The minimum measured value of 454 mM chloride, at Site 683 at ITS, corresponds to ~20% dilution of seawater chloride The most probably sources of these low-chloride fluids are gas hydrate dissociation and mineral (particularly clay) dehydration reactions. Fluid advection is consistent with (1) the extent of dilution shown in the chloride profiles, (2) the striking nonsteady-state depth profiles of chlorides at Sites 683 and 688 and of 87Sr/86Sr ratios at Site 685, and (3) the temperatures resulting from an average geothermal gradient of 50°C/km and required for clay mineral dehydration reactions. Strontium isotope data reveal two separate fluid regimes in this slope region: a more northerly one at Sites 683 and 685 that is influenced by fluids with a radiogenic continental strontium signature, and a southerly one at Sites 682 and 688 that is influenced by fluids with a nonradiogenic oceanic signatures. Stratigraphically controlled fluid migration seems to prevail in this margin.
Because of its special tectonic setting, Site 679 at ITS is geochemically distinct. The interstitial waters are characterized by seawater chloride concentrations to --200 mbsf and deeper by a significantly lower chloride concentration of about two-thirds of the value in seawater, suggesting mixing with a meteoric water source.
Regardless of the hydrogeochemical regime, the chemistry and isotopic compositions of the interstitial waters at all sites are markedly modified by diagenesis, particularly by calcite and dolomite crystallization.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -10.761651 * Median Longitude: -78.881847 * South-bound Latitude: -13.480167 * West-bound Longitude: -80.583500 * North-bound Latitude: -8.991500 * East-bound Longitude: -76.891500
Date/Time Start: 1986-10-31T00:00:00 * Date/Time End: 1986-12-18T09:00:00
Event(s):
112-679 * Latitude: -11.062467 * Longitude: -78.270867 * Date/Time Start: 1986-10-31T00:00:00 * Date/Time End: 1986-11-05T00:00:00 * Elevation: -454.8 m * Penetration: 794.4 m * Recovery: 332.1 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 62 cores; 548.9 m cored; 0 m drilled; 60.5% recovery
112-679D * Latitude: -11.063830 * Longitude: -78.272170 * Date/Time Start: 1986-11-01T12:45:00 * Date/Time End: 1986-11-02T13:15:00 * Elevation: -462.0 m * Penetration: 245.4 m * Recovery: 116.03 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 245.2 m cored; 0 m drilled; 47.3 % recovery
112-679E * Latitude: -11.063000 * Longitude: -78.272330 * Date/Time Start: 1986-11-02T13:15:00 * Date/Time End: 1986-11-05T03:15:00 * Elevation: -462.0 m * Penetration: 359.3 m * Recovery: 36.3 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 114 m cored; 0 m drilled; 31.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
14 datasets

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Datasets listed in this publication series

  1. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 7) Interstitial-water chemistry of ODP Site 112-679. https://doi.org/10.1594/PANGAEA.753622
  2. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Appendix B) Interstitial-water samples corrected for admixed surface seawater introduced by drilling, ODP Leg 112. https://doi.org/10.1594/PANGAEA.753637
  3. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 2) Interstitial-water chemistry of ODP Site 112-680. https://doi.org/10.1594/PANGAEA.753623
  4. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 14) Oxygen and hydrogen isotopic composition of interstitial waters of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753635
  5. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 3) Interstitial-water chemistry of ODP Site 112-681. https://doi.org/10.1594/PANGAEA.753624
  6. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 10) Interstitial-water chemistry of ODP Hole 112-682A. https://doi.org/10.1594/PANGAEA.753625
  7. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 8) Interstitial-water chemistry of ODP Site 112-683. https://doi.org/10.1594/PANGAEA.753626
  8. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 15) Strontium isotopoc composition of bulk solids from ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753636
  9. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 4) Interstitial-water chemistry of ODP Site 112-684. https://doi.org/10.1594/PANGAEA.753627
  10. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 9) Interstitial-water chemistry of ODP Hole 112-685A. https://doi.org/10.1594/PANGAEA.753628
  11. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 5) Interstitial-water chemistry of ODP Site 112-686. https://doi.org/10.1594/PANGAEA.753629
  12. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 6) Interstitial-water chemistry of ODP Site 112-687. https://doi.org/10.1594/PANGAEA.753631
  13. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 11) Interstitial-water chemistry of ODP Site 112-688. https://doi.org/10.1594/PANGAEA.753633
  14. Kastner, M; Elderfield, H; Martin, JB et al. (1990): (Table 12) Strontium isotopic composition of interstitial waters of ODP Leg 112 samples. https://doi.org/10.1594/PANGAEA.753634