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  • 124-767B; 124-767C; 124-768B; 124-768C; DRILL; Drilling/drill rig; Joides Resolution; Leg124; Mindanao Sea; Ocean Drilling Program; ODP; Sulu Sea  (1)
  • 124-768C; 124-770C; Calculated; Color description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg124; Mass spectrometer Finnigan MAT 250; Mindanao Sea; Ocean Drilling Program; ODP; Sample code/label; Sulu Sea; Temperature, calculated; δ13C, calcite; δ18O, calcite  (1)
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  • 1
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    Unknown
    Isotope characterization and estimated temperature of formation of calcite veins in ODP Sites 124-768 and 124-770 (Table 1) (1991)
    PANGAEA
    In:  Supplement to: von Breymann, Marta T; Berner, Ulrich (1991): Isotopic characterization of secondary carbonates from Sulu and Celebes Sea Basalts: contrasting scenarios of basalt-seawater interaction. In: Silver, EA; Rangin, C; von Breymann, MT; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 124, 233-237, https://doi.org/10.2973/odp.proc.sr.124.174.1991
    Details
    Publication Date: 2024-01-09
    Description: Secondary carbonate minerals were recovered within the basalts at both ODP Sites 768 and 770 in the Sulu and Celebes seas. Petrographic and X-ray diffraction analyses indicate that the carbonates are calcites. Other alteration products recognized in the thin sections are smectites, iron oxides, and gypsum. The 13C values of carbonates from both sites range from 1.6 per mil to 2.3 per mil, which are indicative of inorganic carbonate formation with no contributions from 13C-depleted sources such as oxidized organic carbon or methane. The oxygen isotopes at Site 770 range from 30.8 per mil to 31.6 per mil, which indicates a pervasive circulation of cold seawater (9° to 12°C) during alteration of the Celebes Sea basalts. In contrast, carbonates associated with Site 768 basalts have less positive d18O values (21.0 per mil to 27.3 per mil). A lighter 18O isotopic signature indicates the formation of secondary calcite at either higher temperatures or in a system closed to seawater. The rapidly deposited pyroclastic flows at Site 768 would have limited water access to the crust very soon after its formation, which leads us to speculate that the carbonates in the Sulu Sea basalts were formed by isotopically modified fluids resulting from basalt alteration in a closed system.
    Keywords: 124-768C; 124-770C; Calculated; Color description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg124; Mass spectrometer Finnigan MAT 250; Mindanao Sea; Ocean Drilling Program; ODP; Sample code/label; Sulu Sea; Temperature, calculated; δ13C, calcite; δ18O, calcite
    Type: Dataset
    Format: text/tab-separated-values, 154 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Pore-water chemistry of ODP Sites 124-767 and 124-768 (1991)
    PANGAEA
    In:  Supplement to: von Breymann, Marta T; Swart, Peter K; Brass, Garrett W; Berner, Ulrich (1991): Pore-water chemistry of the Sulu and Celebes Seas: extensive diagenetic reactions at Sites 767 and 768. In: Silver, EA; Rangin, C; von Breymann, MT; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 124, 203-215, https://doi.org/10.2973/odp.proc.sr.124.154.1991
    Details
    Publication Date: 2024-01-09
    Description: The combination of multiple sediment sources and varying rates of sediment accumulation in the Celebes and Sulu seas have had significant impact on the processes of diagenesis, mineralization, and pore-fluid flow. Isotopic and mass-balance calculations help elucidate the various reactions taking place in these western Pacific basins, where ash alteration and basalt-seawater interactions are superimposed on the effects of sulfate oxidation of organic carbon and biogenic methane and of dolomitization of biogenic carbonates. Based on the shape of the calcium and magnesium depth profiles, two major reactive zones have been identified. The first is located near the zone of sulfate depletion and is characterized by carbonate recrystallization, dolomitization and ash alteration reactions at both Ocean Drilling Program Sites 767 and 768. The second reactive zone corresponds to the bottom of the sedimentary sequence and is characterized by alteration reactions in the basement (Site 767) and in the pyroclastic deposits beneath the sediment column (Site 768).
    Keywords: 124-767B; 124-767C; 124-768B; 124-768C; DRILL; Drilling/drill rig; Joides Resolution; Leg124; Mindanao Sea; Ocean Drilling Program; ODP; Sulu Sea
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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