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  • 115-707; 115-715; COMPCORE; Composite Core; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean  (1)
  • 115-716B; Atomic absorption spectrometry (AAS), Perkin-Elmer; Calcium carbonate; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Lakshadweep Sea; Leg115; Magnesium; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Sample code/label; Sodium; Strontium; δ13C, carbonate; δ18O, carbonate  (1)
  • PANGAEA  (2)
  • Copernicus
  • 2000-2004
  • 1990-1994  (2)
Collection
Keywords
Publisher
  • PANGAEA  (2)
  • Copernicus
Years
  • 2000-2004
  • 1990-1994  (2)
Year
  • 1
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    Unknown
    Elemental and stable isotopic composition of bulk carbonate samples of ODP Hole 115-716B (Table 1) (1990)
    PANGAEA
    In:  Supplement to: Malone, Mitchell J; Baker, Paul A; Burns, Stephen J; Swart, Peter K (1990): Geochemistry of periplatform carbonate sediments, Leg 115, Site 716 (Maldives Archipelago, Indian Ocean). In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 647-659, https://doi.org/10.2973/odp.proc.sr.115.184.1990
    Details
    Publication Date: 2024-02-10
    Description: Site 716 is a continuous sequence (upper Miocene to Holocene) of periplatform oozes and chalks from the Maldives Ridge, Indian Ocean. Mineralogical and geochemical studies of these carbonate sediments indicate that submarine burial diagenesis has played an important role in the induration of sediments at this site. Metastable carbonates, high-magnesium calcite (HMC) and aragonite, convert to low-magnesium calcite (LMC) rapidly, within 1.1 and 6.0 Ma, respectively. Strontium concentrations in carbonate decrease with depth as the result of the burial diagenesis of calcium car- bonate, primarily aragonite, with excess strontium being expelled into pore waters. The formation of celestite at depth indicates that sufficient diagenesis of carbonate sediments has occurred to saturate or supersaturate pore waters with re- spect to this authigenic mineral. Sodium also decreases monotonically with depth as a result of the burial diagenesis of calcium carbonate. Magnesium and carbon and oxygen isotopic curves are remarkably similar. Carbon isotopic compositions record inputs of 13C-enriched components from shallow carbonate banks. Magnesium concentrations vary widely, recording enhanced episodes of cementation by LMC with slightly elevated magnesium contents. Positive shifts in oxygen isotopic composition also record episodes of cementation during burial diagenesis. Intervals with increased accumulation rates of metastable components have undergone more rapid diagenesis than intervals with predominately pelagic deposition.
    Keywords: 115-716B; Atomic absorption spectrometry (AAS), Perkin-Elmer; Calcium carbonate; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Lakshadweep Sea; Leg115; Magnesium; Mass spectrometer Finnigan MAT 251; Ocean Drilling Program; ODP; Sample code/label; Sodium; Strontium; δ13C, carbonate; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 3035 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Chemical and Sr isotopic compositions and timing of carbonate mineral precipitation, ODP Leg 115 (1992)
    PANGAEA
    In:  Supplement to: Burns, Stephen J; Baker, Paul A; Elderfield, Henry (1992): Timing of carbonate mineral precipitation and fluid flow in sea-floor basalts, northwest Indian Ocean. Geology, 20(3), 255-258, https://doi.org/10.1130/0091-7613(1992)020%3C0255:TOCMPA%3E2.3.CO;2
    Details
    Publication Date: 2024-02-10
    Description: The strontium isotope ratios of authigenic carbonates from Indian Ocean sea-floor basalts have been used to determine the timing of carbonate mineral precipitation and fluid flow. The samples include calcites from 57.2 Ma crust from Ocean Drilling Project (ODP) Site 715, and calcites, aragonites, and siderites from 63.7 Ma crust from ODP Site 707. At Site 715, calcite precipitation may have begun at any time after the basalts cooled, and it continued until approximately 31 Ma, or 26 m.y. after basalt eruption. At Site 707, aragonite and siderite did not begin to precipitate until about 36 Ma, almost 30 m.y. after basalt eruption, and continued to precipitate until at least 30 and 28 Ma, respectively. Calcite precipitation began at approximately 32 Ma and continued until 22 Ma. These ages suggest that vein mineral deposition and low-temperature fluid circulation in the ocean crust may continue for much longer periods of time than previously observed.
    Keywords: 115-707; 115-715; COMPCORE; Composite Core; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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