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Datasets with PANGAEA technical keyword @hmmv

Mostrando recursos 1 - 20 de 49

  1. Chemical composition and age of metamorphic rocks from the Khavyven Highland, Eastern Kamchatka

    Tararin, L A; Badredinov, Z G; Dril', SI
    Metamorphic rocks of the Khavyven Highland in eastern Kamchatka were determined to comprise two complexes of metavolcanic rocks that have different ages and are associated with subordinate amounts of metasediments. The complex composing the lower part of the visible vertical section of the highland is dominated by leucocratic amphibole-mica (+/-garnet) and epidote-mica (+/-garnet) crystalline schists, whose protoliths were andesites and dacites and their high-K varieties of island-arc calc-alkaline series. The other complex composing the upper part of the vertical section consists of spilitized basaltoids transformed into epidote-amphibole and phengite-epidote-amphibole green schists, which form (together with quartzites, serpentinized peridotites, serpentinites, and...

  2. (Table 4b) Chemical composition of metamorphic rocks from the lower unit of the Khavyven Highland

    Tararin, L A; Badredinov, Z G; Dril', SI

  3. Physical oceanography during Akademik Nikolaj Strakhov cruise POEM-BC-A92

    Scarazzato, Paolo; MEDAR Group

  4. Meiofauna abundances in sediments from the Håkon Mosby Mud Volcano (HMMV) obtained during expeditions with Polarstern and Pourquoi Pas ?

    Van Gaever, Saskia; Olu, Karine; Derycke, Sofie; Vanreusel, Ann

  5. Nematode abundances in sediments from the Håkon Mosby Mud Volcano (HMMV) obtained during expeditions with Polarstern and Pourquoi Pas ?

    Van Gaever, Saskia; Olu, Karine; Derycke, Sofie; Vanreusel, Ann

  6. (Table 6) Gas hydrate-related details of unit I and unit II deposits at the Hakon Mosby Mud Volcano

    Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard

  7. (Table 6) Gas hydrate-related details of unit I and unit II deposits at the Hakon Mosby Mud Volcano

    Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard

  8. Gas hydrates of nonpressurized (GC) and pressurized (DAPC) sediment cores from the Hakon Mosby Mud Volcano, SW Barents Sea

    Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard
    The occurrence of gas hydrates at submarine mud volcanoes (MVs) located within the gas hydrate stability zone (GHSZ) is controlled by upward fluid and heat flux associated with MV activity. Determining the spatial distribution of gas hydrates at MVs is crucial to evaluate their sensitivity to known episodic changes in volcanic activity. We determined the hydrocarbon inventory and spatial distribution of hydrates at an individual MV structure. The Håkon Mosby Mud Volcano (HMMV), located at 1,250 m water depth on the Barents Sea slope, was investigated by combined pressure core sampling, heat flow measurements, and pore water chemical analysis. Quantitative...

  9. (Table 5) Gas and gas hydrate contents in pressurized cores taken from the Hakon Mosby Mud Volcano during ARK-XXII/1b

    Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard

  10. (Table 2) General characteristics of pressure cores taken during ARK-XXII/1b at the Hakon Mosby Mud Volcano

    Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard

  11. (Table 1) Station characteristics of nonpressurized (GC) and pressurized (DAPC) sediment cores recovered from the Hakon Mosby Mud Volcano during ARK-XXII/1b in summer 2007

    Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard

  12. Meiobenthos at the Arctic Håkon Mosby Mud Volcano

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann
    Håkon Mosby Mud Volcano (HMMV, SW Barents Sea slope, 1280 m) is one of the numerous cold methane-venting seeps existing along the continental margins. Analyses of video-guided core samples revealed extreme differences in the diversity and density of the metazoan meiobenthic communities associated with the different sub-habitats (centre, microbial mats, Pogonophora field, outer rim) of this mud volcano. Diversity was lowest in the sulphidic, microbial mat sediments that supported the highest standing stock, with unusually high densities (11000 ind./10 cm**2) of 1 nematode species related to Geomonhystera disjuncta. Stable carbon isotope analyses revealed that this nematode species was thriving on...

  13. Methane and sulphate consumption in different habitats of the Håkon Mosby Mud Volcano (HMMV)

    Felden, Janine; Wenzhöfer, Frank; Boetius, Antje
    The Hakon Mosby Mud Volcano is a highly active methane seep hosting different chemosynthetic communities such as thiotrophic bacterial mats and siboglinid tubeworm assemblages. This study focuses on in situ measurements of methane fluxes to and from these different habitats, in comparison to benthic methane and oxygen consumption rates. By quantifying in situ oxygen, methane, and sulfide fluxes in different habitats, a spatial budget covering areas of 10-1000 -m diameter was established. The range of dissolved methane efflux (770-2 mmol m-2 d-1) from the center to the outer rim was associated with a decrease in temperature gradients from 46°C to...

  14. Biogeochemical investigation of sediments at the Hakon Mosby Mud Volcano (Barents Sea)

    Lichtschlag, Anna; Felden, Janine; Brüchert, Volker; Boetius, Antje; de Beer, Dirk
    We have investigated if in a cold seep methane or sulfide is used for chemosynthetic primary production and if significant amounts of the sulfide produced by anaerobic oxidation of methane are oxidized geochemically and hence are not available for chemosynthetic production. Geochemically controlled redox reactions and biological turnover were compared in different habitats of the Håkon Mosby Mud Volcano. The center of the mud volcano is characterized by the highest fluid flow, and most primary production by the microbial community depends on oxidation of methane. The small amount of sulfide produced is oxidized geochemically with oxygen or is precipitated with...

  15. Meiofauna abundances at the Arctic Håkon Mosby Mud Volcano (HMMV) of sediment core PS64/395-1

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann

  16. Meiofauna abundances at the Arctic Håkon Mosby Mud Volcano (HMMV) of sediment core PS64/390-1c

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann

  17. Meiofauna abundances at the Arctic Håkon Mosby Mud Volcano (HMMV) of sediment core PS64/390-1a

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann

  18. Meiofauna abundances at the Arctic Håkon Mosby Mud Volcano (HMMV) of sediment core PS64/367-1

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann

  19. Meiofauna abundances at the Arctic Håkon Mosby Mud Volcano (HMMV) of sediment core PS64/363-1b

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann

  20. Meiofauna abundances at the Arctic Håkon Mosby Mud Volcano (HMMV) of sediment core PS64/363-1a

    Van Gaever, Saskia; Moodley, Leon; de Beer, Dirk; Vanreusel, Ann

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