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  • 2000-2004  (113)
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  • 1
    Book
    Book
    Geochemische Untersuchungen an hydrothermal beeinflußten Sedimenten der Bransfield Straße (Antarktis) : = Geochemical investigations on hydrothermally influenced sediments of Bransfield strait (Antarctica) (2001)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Details Availability
    Keywords: Fluid inclusions Bransfield Strait ; Marine sediments Bransfield Strait ; Sedimentanalyse ; Hydrothermalprozess ; Dissertation ; Bransfield-Straße ; Hochschulschrift ; Bransfield-Straße ; Sediment ; Hydrothermale Lagerstätte ; Geochemie ; Bransfield-Straße Region ; Sedimentanalyse ; Hydrothermale Phase
    Type of Medium: Book
    Pages: VI, 157 S. , graph. Darst., Kt.
    Series Statement: Berichte zur Polar- und Meeresforschung 392
    URL: http://www.gbv.de/dms/bs/toc/332306631.pdf
    URL: http://www.gbv.de/dms/bs/toc/332306631.pdf
    RVK:
    RY 20075
    Language: German
    Note: Literaturverz. S. 111 - 124 , Teilw. zugl.: Kiel, Univ., Diss., 2000 u.d.T.: Dählmann, Anke: Dynamik globaler Stoffkreisläufe im System Erde
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  • 2
    Online Resource
    Online Resource
    Geochemische Untersuchungen an hydrothermal beeinflußten Sedimenten der Bransfield Straße (2000)
    Kiel
    Details Availability
    Keywords: Dissertation ; Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (165 Seiten = 8 MB) , Illustrationen, Graphen, Karte
    Edition: Online-Ausgabe 2023
    URL: https://oceanrep.geomar.de/id/eprint/58862/
    Language: German
    Note: Zusammenfassung in englischer Sprache
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  • 3
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    Geochemische Untersuchungen an hydrothermal beeinflußten Sedimenten der Bransfield Straße (2000)
    Details
    Publication Date: 2023-07-10
    Description: This work presents investigations of hydrothermally influenced sediments of the Bransfield Strait, an extensional marginal basin between the Antarctic Peninsula and the South Shetland lslands. Although the hydrothermal activity of Bransfield Strait has been documented since the mid-eighties, the first samples of warm, hydrothermally influenced sediments at Hook Ridge were obtained during the expeditions ANT-XV/2 with RN Polarstern in 1997/98 and NBP 99-04 with RN IB N. B.Palmer in 1999. The vent sites are characterized by white siliceous crusts on top of the sediment layer and by temperatures of up to 48.6°C. Pore waters are enriched in silica and sulfide and show low pH values. The very shallow depth of these vent sites (1050 m) and the influence of volcanic activity particularly control the concentration of pore fluid constituents. Chloride is depleted up to 20 % and the calculated hydrothermal endmember concentration is in the range of 1 to 84 mM. This fluid composition is attributed to phase separation, since other mechanisms for Cl depletion can clearly be ruled out. The depth of phase separation, inferred by using a relationship between Cl concentrations of the phase separated fluids and p,T conditions, is about 1450 m beneath the seafloor at Hook Ridge. Thus, phase separation takes place at subcritical conditions. Whereas the sediments on Hook Ridge are characterized by diffuse outflow of hydrothermal fluids, the hydrothermal impact on the sediments of the NE part of the adjacent King George Basin is shown in deeper sections of these cores (6 m). Depth profiles of elements that are not affected by diagenesis reveal diffusion controlled transport from a reaction layer below the sampling depth. The direct vicinity to the hydrothermally active volcanic edifice Hook Ridge suggests that this reaction layer is within the basal sediments that are heated by the hot crust underneath. This interpretation is confirmed by various geochemical characteristics of the pore fluids from which the temperature of the reaction zone is estimated to be ≤ 150°C. Analyses of boron and strontium isotopic compositions of the pore waters yield endmember signatures of 21 ‰ (δ 11 B) and 0.7028 (87Sr/86Sr) respectively. These findings indicate an intense interaction of the hydrothermal fluid with the sediments and the upper crust. Linear extrapolation of the chloride concentration versus magnesium yields an endmember concentration of 704 mM, which indicates the existence of a brine phase that corresponds to the vapor phase sampled at Hook Ridge. The investigations on the sediments and pore waters of Hook Ridge and King George Basin demonstrate that both locations are affected by the hydrothermal activity within the upper crust at the rift axis of Bransfield Strait. They are to be considered as two components of one hydrothermal system (see Figure 6-1 in the German summary for a schematic diagram). Since water column anomalies and a chimney-like fragment within the sediment provide promising evidence of active high temperature venting, manifestations of hot vents are likely to be discovered on upcoming cruises.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 4
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    Carbon and nitrogen content in surface sediment profile PS47/089C (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: ANT-XV/2; Carbon, total; DEPTH, sediment/rock; Element analyser CHN; Nitrogen, total; Polarstern; PS47; PS47/089C; Television-Grab; TVG; TVG89C
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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  • 5
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    Carbon and nitrogen content in surface sediment profile PS47/091C (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: ANT-XV/2; Carbon, total; DEPTH, sediment/rock; Element analyser CHN; Nitrogen, total; Polarstern; PS47; PS47/091C; Television-Grab; TVG; TVG91C
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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  • 6
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    Stable isotopes measured in sediment profile PS47/091D (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: ANT-XV/2; DEPTH, sediment/rock; Isotope ratio mass spectrometry; Polarstern; PS47; PS47/091D; Television-Grab; TVG; TVG91D; δ11B; δ13C, dissolved inorganic carbon; δ18O, water; δ Deuterium
    Type: Dataset
    Format: text/tab-separated-values, 38 data points
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  • 7
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    Geochemistry from sediment profile PS47/091B (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: Aluminium oxide; ANT-XV/2; Calcium oxide; DEPTH, sediment/rock; Iron oxide, Fe2O3; Magnesium oxide; Manganese oxide; Polarstern; Potassium oxide; PS47; PS47/091B; Silicon dioxide; Sodium oxide; Television-Grab; Titanium dioxide; TVG; TVG91B; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 198 data points
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  • 8
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    Carbon and nitrogen content in surface sediment profile PS47/087B (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: ANT-XV/2; Carbon, total; DEPTH, sediment/rock; Element analyser CHN; Nitrogen, total; Polarstern; PS47; PS47/087B; Television-Grab; TVG; TVG87B
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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  • 9
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    Carbon and nitrogen content in surface sediment profile PS47/087D (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: ANT-XV/2; Carbon, total; DEPTH, sediment/rock; Element analyser CHN; Nitrogen, total; Polarstern; PS47; PS47/087D; Television-Grab; TVG; TVG87D
    Type: Dataset
    Format: text/tab-separated-values, 32 data points
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  • 10
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    Carbon and nitrogen content in surface sediment profile PS47/091A (2001)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: ANT-XV/2; Carbon, total; DEPTH, sediment/rock; Element analyser CHN; Nitrogen, total; Polarstern; PS47; PS47/091A; South Atlantic; Television-Grab; TVG
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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