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  • 1
    facet.materialart.
    Unbekannt
    Table 1. Isotopic composition of hydrated and dehydrated subsamples from sediment core M56_278 (2011)
    PANGAEA
    In:  Supplement to: Suess, Erwin; Balzer, Wolfgang; Hesse, Karl-Friedrich; Müller, Peter J; Ungerer, C A; Wefer, Gerold (1982): Calcium carbonate hexahydrate from organic-rich sediments of the Antarctic shelf: precursors of Glendonites. Science, 216(4550), 1128-1131, https://doi.org/10.1126/science.216.4550.1128
    Details
    Publikationsdatum: 2023-02-07
    Beschreibung: Large euhedral crystals of calcium carbonate hexahydrate were recovered from a shelf basin of the Bransfield Strait, Antarctic Peninsula, at a water depth of 1950 meters and sub-zero bottom water temperatures. The chemistry, mineralogy, and stable isotope composition of this hydrated calcium carbonate phase, its environment of formation, and its mode of precipitation confirm the properties variously attributed to hypothetical precursors of the glendonites and thereby greatly expand their use in paleoceanographic interpretation.
    Schlagwort(e): 278; DEPTH, sediment/rock; FIBEX - First International BIOMASS Experiment, ANT I; KAL; Kasten corer; M56; M56_278; Meteor (1964); δ13C; δ18O
    Materialart: Dataset
    Format: text/tab-separated-values, 8 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 2
    Digitale Medien
    Digitale Medien
    Inductively Coupled Plasma Mass Spectrometry in Geochemistry (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 23 (1995), S. 409-449 
    Details
    ISSN: 0084-6597
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ea.23.050195.002205
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    facet.materialart.
    Unbekannt
    Mg-NH4 exchange on humic acid: A radiotracer technique for conditional exchange constants in a seawater medium (1988)
    Elsevier
    In:  Chemical Geology, 70 (4). pp. 349-357.
    Details
    Publikationsdatum: 2016-07-19
    Beschreibung: A radiotracer technique, employing 27Mg, is used to determine the Mg released by ammonium exchange on undis-solved humic acid in a seawater medium. This new method allows for the measurement of exchangeable Mg on the solid phase surface, which eliminates the problem caused by the high-Mg background in the seawater matrix. The precision calculated from the counting statistics is better than ±2%; the reproducibility among repeated counts ranged from ±1% to ±3%. The higher sensitivity of the method allows for monitoring the MgNH4 exchange at concentrations as low as 30 mM NH4. This is a major improvement relative to the data obtained with the analytical methods used so far, which allow detection of exchangeable Mg only at NH4 concentrations higher than 1 M. The lower experimental concentrations are more in accordance with the natural ammonium levels found in anoxic marine sediments. For the undissolved humic acid used in this experiment, the amount of exchangeable Mg in apparent equilibrium with an ammonium-free seawater matrix was found to be 96.6 ± 0.4 meq/100g. The Mg-NH4 exchange on humic acid in seawater comes to a steady-state value in 〈 18 min. The conditional equilibrium constant obtained for this reaction, Kcond = 0.039 ± 0.001 M−1. The technique can be expanded to other geochemical solid phases in seawater and it can be modified to study the behavior of the major cations by using 24Na, 42K and 49Ca.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0009-2541(88)90124-6
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 4
    facet.materialart.
    Unbekannt
    Calcium Carbonate Hexahydrate from Organic-Rich Sediments of the Antarctic Shelf: Precursors of Glendonites (1982)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 216 (4550). pp. 1128-1131.
    Details
    Publikationsdatum: 2018-03-08
    Beschreibung: Large euhedral crystals of calcium carbonate hexahydrate were recovered from a shelf basin of the Bransfield Strait, Antarctic Peninsula, at a water depth of 1950 meters and sub-zero bottom water temperatures. The chemistry, mineralogy, and stable isotope composition of this hydrated calcium carbonate phase, its environment of formation, and its mode of precipitation confirm the properties variously attributed to hypothetical precursors of the glendonites and thereby greatly expand their use in paleoceanographic interpretation.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1126/science.216.4550.1128
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
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