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Decitre, Sylvie; Buatier, Martine D; James, Rachael H (2004): Mineral, chemical and isotopic compositions of hydrothermally altered sediments from the Middle Valley (Juan de Fuca Ridge), ODP Site 139-858 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.706282, Supplement to: Decitre, S et al. (2004): Li and Li isotopic composition of hydrothermally altered sediments at Middle Valley, Juan De Fuca. Chemical Geology, 211(3-4), 363-373, https://doi.org/10.1016/j.chemgeo.2004.07.005

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Abstract:
Li and Li isotopes have been measured in the clay fraction of sediments recovered from the Middle Valley hydrothermal site on the Juan De Fuca Ridge. The Li content of pure detrital clays is 51 ppm while hydrothermal clays and carbonates have lower Li (22+/-11 ppm). However, there is no clear relationship between the mineralogy of the hydrothermal alteration products and their Li content. The d7Li value of the detrital clays is +5.8‰. Hydrothermal clays and carbonates have d7Li in the range of -3.9‰ to +7.8‰; these values do not seem to be dependent on the temperature at which they formed. Modelling of the Li and Li isotope systematics indicates that the fluid from which the alteration products form is significantly enriched in Li (higher than 10000 µmol/kg) relative to pore fluids recovered from within the sediments (up to 589 µmol/kg; [Wheat, C.G., M.J. Mottl, 1994. Data report: trace metal composition of pore water from Sites 855 through 858, Middle valley, Juan De Fuca Ridge. In Mottl, M.J., Davis, E.E., Fisher, A.T., Slack, J.F. (Eds.), Proc. ODP, Sci. Res. 139: 749–755; doi:10.2973/odp.proc.sr.139.269.1994]), and that this Li is derived from sediment. Thus, the alteration products are not in equilibrium with their conjugate pore fluids; rather, the alteration minerals formed at lower water/sediment ratios. This suggests that fluid flow pathways at Middle Valley were more diffuse in the past than they are today.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 48.456300 * Median Longitude: -128.711000 * South-bound Latitude: 48.455700 * West-bound Longitude: -128.713000 * North-bound Latitude: 48.456900 * East-bound Longitude: -128.709000
Date/Time Start: 1991-08-09T12:30:00 * Date/Time End: 1991-08-13T17:30:00
Event(s):
139-858A * Latitude: 48.456900 * Longitude: -128.713000 * Date/Time Start: 1991-08-09T12:30:00 * Date/Time End: 1991-08-12T16:30:00 * Elevation: -2420.0 m * Penetration: 339.1 m * Recovery: 97.77 m * Location: North Pacific Ocean * Campaign: Leg139 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 339.1 m cored; 0 m drilled; 28.8 % recovery
139-858B * Latitude: 48.455700 * Longitude: -128.709000 * Date/Time Start: 1991-08-12T16:30:00 * Date/Time End: 1991-08-13T17:30:00 * Elevation: -2420.0 m * Penetration: 38.6 m * Recovery: 31.67 m * Location: North Pacific Ocean * Campaign: Leg139 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 38.6 m cored; 0 m drilled; 82 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Decitre, S; Buatier, MD; James, RH (2004): (Table 1) Mineral composition of clay fractions and bulk rocks, and δ¹⁸O, d2H(d1D) and δ¹³C values for clay fractions of bottom sediments from ODP Hole 139-858A. https://doi.org/10.1594/PANGAEA.706271
  2. Decitre, S; Buatier, MD; James, RH (2004): (Table 1) Mineral composition of clay fractions and bulk rocks, and δ¹⁸O, d2H(d1D) and δ¹³C values for clay fractions of bottom sediments from ODP Hole 139-858B. https://doi.org/10.1594/PANGAEA.706272
  3. Decitre, S; Buatier, MD; James, RH (2004): (Table 2) Li and Li isotopic composition for clay fractions of bottom sediments from ODP Hole 139-858A. https://doi.org/10.1594/PANGAEA.706280
  4. Decitre, S; Buatier, MD; James, RH (2004): (Table 2) Li and Li isotopic composition for clay fractions of bottom sediments from ODP Hole 139-858B. https://doi.org/10.1594/PANGAEA.706281