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Gieskes, Joris M; Kastner, Miriam; Erzinger, Jörg; Boulègue, Jacques; Hart, Stanley R (1986): Geochemistry, minerals, color, rare earth elements and δ¹⁸O at DSDP Hole 92-504B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.792708, Supplement to: Gieskes, JM et al. (1986): Geochemical studies in Hole 504B, Leg 92. In: Leinen, M; Rea DK; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 92, 547-562, https://doi.org/10.2973/dsdp.proc.92.136.1986

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Abstract:
Investigations of borehole waters sampled in Hole 504B during Leg 92 revealed changes in major-ion composition similar to changes observed previously (during Leg 83). The uniformity of chloride concentrations with increasing depth suggests efficient downhole mixing processes along density gradients caused by large temperature gradients. Chemical and mineralogical studies of suspended drilling mud (bentonite) suggest that this material has undergone substantial alteration and that CaSO4 (anhydrite/gypsum) has precipitated in the deeper parts of the hole. Rare earth element studies suggest contributions of both the bentonites and the basalts to the REE distributions. Studies of the isotopic composition (87Sr/86Sr) of dissolved strontium indicate a strong contribution of basaltic nonradiogenic strontium, although differences between the Leg 83 and Leg 92 data indicate an influence of bentonite during Leg 92. The oxygen isotope composition of the water does not change appreciably downhole. This uniformity can be understood in terms of high water-rock ratios and suggests that the chemical changes observed are due either to alteration processes involving bentonites and basaltic material from the walls of the hole or to exchange with formation fluids from the surrounding basement, which may have altered in composition at relatively high water-rock ratios.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 1.226700 * Longitude: -83.730000
Event(s):
92-504_Site * Latitude: 1.226700 * Longitude: -83.730000 * Elevation: -3464.0 m * Penetration: 12.04 m * Campaign: Leg92 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 0 cores; 0 m cored; 0 m drilled
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 2) Formation water chemical composition at DSDP Hole 92-504B. https://doi.org/10.1594/PANGAEA.792701
  2. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 7) Chemistry of bentonite and go-devil samples, at DSDP Hole 92-504B. https://doi.org/10.1594/PANGAEA.792706
  3. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 4) Colors of bentonite and DSDP Hole 92-504B mud. https://doi.org/10.1594/PANGAEA.792703
  4. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 8A) Oxygen isotopes of borehole fluids at DSDP Hole 92-504B. https://doi.org/10.1594/PANGAEA.792707
  5. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 6) Mineralogy of at DSDP Hole 92-504B. https://doi.org/10.1594/PANGAEA.792705
  6. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 5) Mineralogy of drilling mud in DSDP Hole 92-504B. https://doi.org/10.1594/PANGAEA.792704
  7. Gieskes, JM; Kastner, M; Erzinger, J et al. (1986): (Table 3) Rare earth elements in DSDP Hole 92-504B. https://doi.org/10.1594/PANGAEA.792702