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  • 139-858A; 139-858B; DRILL; Drilling/drill rig; Joides Resolution; Leg139; North Pacific Ocean; Ocean Drilling Program; ODP  (1)
  • 169-1038A; 169-1038B; 169-1038C; 169-1038D; 169-1038F; 169-1038G; 169-1038H; 169-1038I; DRILL; Drilling/drill rig; Escanaba Trough, North Pacific Ocean; Joides Resolution; Leg169; Ocean Drilling Program; ODP  (1)
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  • 1
    facet.materialart.
    Unknown
    Mineral, chemical and isotopic compositions of hydrothermally altered sediments from the Middle Valley (Juan de Fuca Ridge), ODP Site 139-858 (2004)
    PANGAEA
    In:  Supplement to: Decitre, Sylvie; Buatier, Martine D; James, Rachael H (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
    Details
    Publication Date: 2024-01-09
    Description: 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.
    Keywords: 139-858A; 139-858B; DRILL; Drilling/drill rig; Joides Resolution; Leg139; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    The alkali element and boron geochemistry of ODP Site 169-1038 in the Escanaba Trough, East Pacific (1999)
    PANGAEA
    In:  Supplement to: James, Rachael H; Rudnicki, Mark D; Palmer, Martin R (1999): The alkali element and boron geochemistry of the Escanaba Trough sediment-hosted hydrothermal system. Earth and Planetary Science Letters, 171(1), 157-169, https://doi.org/10.1016/S0012-821X(99)00140-5
    Details
    Publication Date: 2024-01-09
    Description: A suite of conjugate pore fluid and sediment samples were collected during Leg 169 of the ODP from within the clastic sedimentary sequences which host massive sulphides at Central Hill, Escanaba Trough (ODP Site 1038). We report the alkali element and boron, and Li and B isotope data for these samples. Relative to a reference site (Site 1037) located outside the zone of high heat flow, pore fluids from Site 1038 show a wide variation in Cl (300-800 mM), and have far higher concentrations of Li (up to 6.2 mM), B (up to 9.7 mM), Cs (up to 5.0 mM), and Rb (up to 97 mM). We show that the pore fluids are derived from hydrothermal circulation that has extended into the basement oceanic crust, with input of the alkali elements and B as the rising hydrothermal fluids interact geochemically with the overlying clastic sediments. There is, however, no marked depletion of these elements in the conjugate sediments, suggesting that there has been advective transport of fluids away from the primary hydrothermal reaction site. This is supported by modelling of the Li and B isotope systematics of the pore fluids, which shows that they record extensive formation of secondary minerals during cooling of the fluids from ~350 to ~20ºC. Precipitation of metal-rich sulphides would have occurred prior to the formation of these minerals, thus, the pore fluid Li and B isotope data can place important constraints on the locus of sulphide deposition beneath the seafloor at Escanaba.
    Keywords: 169-1038A; 169-1038B; 169-1038C; 169-1038D; 169-1038F; 169-1038G; 169-1038H; 169-1038I; DRILL; Drilling/drill rig; Escanaba Trough, North Pacific Ocean; Joides Resolution; Leg169; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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