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  • 2005-2009  (34)
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Year
  • 1
    Online Resource
    Online Resource
    Volcanogenic sediment-seawater interactions and the geochemistry of pore waters (2008)
    Associated volumes
    Details Availability
    In: Chemical geology, Amsterdam [u.a.] : Elsevier, 1966, 249(2008), 3/4, Seite 321-338, 0009-2541
    In: volume:249
    In: year:2008
    In: number:3/4
    In: pages:321-338
    Description / Table of Contents: Four volcanic ash-bearing marine sediment cores and one ash-free reference core were examined during research cruise RV Meteor 54/2 offshore Nicaragua and Costa Rica to investigate the chemical composition of pore waters related to volcanic ash alteration. Sediments were composed of terrigenous matter derived from the adjacent continent and contained several distinct ash layers. Biogenic opal and carbonate were only minor components. The terrigenous fraction was mainly composed of smectite and other clay minerals while the pore water composition was strongly affected by the anaerobic degradation of particulate organic matter via microbial sulphate reduction. The alteration of volcanic matter showed only a minor effect on major element concentrations in pore waters. This is in contrast to prior studies based on long sediment cores taken during the DSDP, where deep sediments always showed distinct signs of volcanic ash alteration. The missing signal of ash alteration is probably caused by low reaction rates and the high background concentration of major dissolved ions in the seawater-derived pore fluids. Dissolved silica concentrations were, however, significantly enriched in ash-bearing cores and showed no relation to the low but variable contents of biogenic opal. Hence, the data suggest that silica concentrations were enhanced by ash dissolution. Thus, the dissolved silica profile measured in one of the sediment cores was used to derive the in-situ dissolution rate of volcanic glass particles in marine sediments. A non-steady state model was run over a period of 43 kyr applying a constant pH of 7.30 and a dissolved Al concentration of 0.05 myM. The kinetic constant (AA) was varied systematically to fit the model to the measured dissolved silica-depth profile. The best fit to the data was obtained applying AA = 1.3 × 10-U9 mol of Si cm- 2 s- 1. This in-situ rate of ash dissolution at the seafloor is three orders of magnitude smaller than the rate of ash dissolution determined in previous laboratory experiments. Our results therefore imply that field investigations are necessary to accurately predict natural dissolution rates of volcanic glasses in marine sediments.
    Type of Medium: Online Resource
    ISSN: 0009-2541
    DOI: 10.1016/j.chemgeo.2008.01.026
    Language: English
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  • 2
    Online Resource
    Online Resource
    Native SnPb droplets in a zeolitic amygdale (Isle of Mull, Inner Hebrides) (2009)
    Associated volumes
    Details Availability
    In: Geochimica et cosmochimica acta, New York, NY [u.a.] : Elsevier, 1950, 73(2009), 10, Seite 2907-2919, 0016-7037
    In: volume:73
    In: year:2009
    In: number:10
    In: pages:2907-2919
    Type of Medium: Online Resource
    Pages: Ill., graph. Darst
    ISSN: 0016-7037
    DOI: 10.1016/j.gca.2009.02.017
    Language: English
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  • 3
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    Component parts of the World Heat Flow Data Collection (2005)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Keywords: Area/locality; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no
    Type: Dataset
    Format: text/tab-separated-values, 125 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    (Appendix B2) Chemical composition of sediment core M54/2_2 (2008)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Calcium carbonate; Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN, Carlo Erba; GC_T; Gravity Corer/temperature probe; M54/2; M54/2_2; Meteor (1986); Nitrogen, total; Opal, biogenic silica; Sequential leaching technique; SFB574; Sulfur, total; Volatiles and Fluids in Subduction Zones; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 136 data points
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  • 5
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    (Appendix F) Petrology and ages of ash layers (2008)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Age model; Age model, optional; Ash, volcanic; Ash, volcanic, altered; Ash, volcanic, felsic; Ash, volcanic, fresh; Ash, volcanic, mafic; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; GC_T; Gravity Corer/temperature probe; M54/2; M54/2_11-2; M54/2_13; M54/2_2; Meteor (1986); PC; Piston corer; Sedimentation rate per year; Sediments; SFB574; Silicon dioxide; Volatiles and Fluids in Subduction Zones
    Type: Dataset
    Format: text/tab-separated-values, 299 data points
    Location Call Number Limitation Availability
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  • 6
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    (Appendix D2) Chemical composition of sediment core M54/2_81-1 (2008)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Calcium carbonate; Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN, Carlo Erba; GC; Gravity corer; M54/2; M54/2_81-1; Meteor (1986); Nitrogen, total; Opal, biogenic silica; Sequential leaching technique; SFB574; Sulfur, total; Volatiles and Fluids in Subduction Zones; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 95 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Geochemistry of pore water and sediments offshore Nicaragua and Costa Rica (2008)
    PANGAEA
    In:  Supplement to: Schacht, Ulrike; Wallmann, Klaus; Kutterolf, Steffen; Schmidt, Mark (2008): Volcanogenic sediment-seawater interactions and the geochemistry of pore waters. Chemical Geology, 249(3-4), 321-338, https://doi.org/10.1016/j.chemgeo.2008.01.026
    Details
    Publication Date: 2023-10-28
    Description: Four volcanic ash-bearing marine sediment cores and one ash-free reference core were examined during research cruise RV Meteor 54/2 offshore Nicaragua and Costa Rica to investigate the chemical composition of pore waters related to volcanic ash alteration. Sediments were composed of terrigenous matter derived from the adjacent continent and contained several distinct ash layers. Biogenic opal and carbonate were only minor components. The terrigenous fraction was mainly composed of smectite and other clay minerals while the pore water composition was strongly affected by the anaerobic degradation of particulate organic matter via microbial sulphate reduction. The alteration of volcanic matter showed only a minor effect on major element concentrations in pore waters. This is in contrast to prior studies based on long sediment cores taken during the DSDP, where deep sediments always showed distinct signs of volcanic ash alteration. The missing signal of ash alteration is probably caused by low reaction rates and the high background concentration of major dissolved ions in the seawater-derived pore fluids. Dissolved silica concentrations were, however, significantly enriched in ash-bearing cores and showed no relation to the low but variable contents of biogenic opal. Hence, the data suggest that silica concentrations were enhanced by ash dissolution. Thus, the dissolved silica profile measured in one of the sediment cores was used to derive the in-situ dissolution rate of volcanic glass particles in marine sediments. A non-steady state model was run over a period of 43 kyr applying a constant pH of 7.30 and a dissolved Al concentration of 0.05 ?M. The kinetic constant (AA) was varied systematically to fit the model to the measured dissolved silica-depth profile. The best fit to the data was obtained applying AA = 1.3 * 10**-U9 mol of Si/cm**2/ s. This in-situ rate of ash dissolution at the seafloor is three orders of magnitude smaller than the rate of ash dissolution determined in previous laboratory experiments. Our results therefore imply that field investigations are necessary to accurately predict natural dissolution rates of volcanic glasses in marine sediments.
    Keywords: GC; GC_T; Gravity corer; Gravity Corer/temperature probe; M54/2; M54/2_11-2; M54/2_13; M54/2_2; M54/2_57; M54/2_81-1; Meteor (1986); PC; Piston corer; SFB574; Volatiles and Fluids in Subduction Zones
    Type: Dataset
    Format: application/zip, 11 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    (Appendix E2) Chemical composition of sediment core M54/2_57 (2008)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Calcium carbonate; Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN, Carlo Erba; GC_T; Gravity Corer/temperature probe; M54/2; M54/2_57; Meteor (1986); Nitrogen, total; Opal, biogenic silica; Sequential leaching technique; SFB574; Sulfur, total; Volatiles and Fluids in Subduction Zones; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 74 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    (Appendix B1) Chemical composition of pore waters of sediment core M54/2_2 (2008)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Alkalinity, total; Calcium; DEPTH, sediment/rock; GC_T; Gravity Corer/temperature probe; M54/2; M54/2_2; Magnesium; Meteor (1986); Photometer, molybdene blue; Potassium; SFB574; Silicon; Sodium; Sulfate; Titration; Volatiles and Fluids in Subduction Zones
    Type: Dataset
    Format: text/tab-separated-values, 182 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    (Appendix E1) Chemical composition of pore waters of sediment core M54/2_57 (2008)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Alkalinity, total; Calcium; DEPTH, sediment/rock; GC_T; Gravity Corer/temperature probe; M54/2; M54/2_57; Magnesium; Meteor (1986); Photometer, molybdene blue; Potassium; SFB574; Silicon; Sodium; Sulfate; Titration; Volatiles and Fluids in Subduction Zones
    Type: Dataset
    Format: text/tab-separated-values, 98 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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