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  • Center for Marine Environmental Sciences; MARUM  (22)
  • Methanlagerstätte  (3)
Document type
Keywords
Publisher
Language
Years
  • 1
    Online Resource
    Online Resource
    METRO : METhane and methane hydRates with in the Black Sea: Structural analyses, quantification and impact of a dynamic methane reservoir ; final report ; [Zeitraum des Vorhabens: 01. Oktober 2004 - 31. Dezember 2007, TP4 verlängert bis 30. April 2008] (2008)
    Bremen
    Details Availability
    Keywords: Forschungsbericht ; Gashydrate ; Methanlagerstätte
    Type of Medium: Online Resource
    Pages: Online-Ressource (31 S., 2,01 MB) , Ill., graph. Darst.
    URL: https://edocs.tib.eu/files/e01fb09/60185828X.pdf
    URL: https://doi.org/10.2314/GBV:60185828X
    URL: https://edocs.tib.eu/files/e01fb09/60185828Xl.pdf
    DOI: 10.2314/GBV:60185828X
    Language: English
    Note: Förderkennzeichen BMBF 03G0604 - 03G0604B. - Verbund-Nr. 01031454 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Auch als elektronische Ressource vorh , Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 2
    Book
    Book
    FS/RV Meteor, Cruise report M52-1 : MARGASCH, marine gas hydrates of the Black Sea ; Istanbul - Istanbul, January 2 - February 1, 2002 (2002)
    Kiel : GEOMAR
    Details Availability
    Keywords: Natural gas Hydrates ; Fahrtbericht ; Black Sea ; gas hydrates ; Forschungsbericht ; Schwarzes Meer ; Meeresboden ; Gashydrate ; Schlammvulkan ; Seismische Prospektion ; Biogeochemie ; Schwarzes Meer ; Meeresboden ; Krim ; Schlammvulkan ; Seismische Prospektion ; Biogeochemie ; Schwarzes Meer ; Meeresgeologie ; Meereschemie ; Meeresbiologie ; Expedition ; Meteor ; Gashydrate ; Methanlagerstätte ; Schwarzes Meer ; Meteor
    Type of Medium: Book
    Pages: 192 S. , Ill., graph. Darst., Kt.
    Series Statement: GEOMAR Report 108
    URL: http://www.gbv.de/dms/goettingen/361921209.pdf
    DDC: 550
    Language: English
    Note: Literaturverz. S. 149 - 150
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  • 3
    Book
    Book
    R/V Meteor cruise report M72/3 : marine gas hydrates of the eastern Black Sea ; M72, Leg 3a, Istanbul - Trabzon, 17 March - 3 April, 2007 ; M72, Leg 3b, Trabzon - Istanbul, 3 - 23 April, 2007 ; cruise within the framework of the BMBF/DFG special programme Geotechnologien: "METRO - Methane and methane hydrates within the Black Sea: structural analyses, quantification and impact of a dynamic methane reservoir" (2007)
    Bremen : Fachbereich Geowiss., Univ.
    Details Availability
    Keywords: Natural gas Hydrates ; Fahrtbericht ; gas hydrates ; Black Sea ; Gashydrate ; Methanlagerstätte ; Schwarzes Meer ; Meteor
    Type of Medium: Book
    Pages: 130, A41 S. , Ill., graph. Darst., Kt.
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 261
    DDC: 550
    RVK:
    TI 7560
    Language: English
    Note: Literaturverz. S. 128 - 130
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  • 4
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    Organic matter based proxies from surface sediments along three transects on the Pakistan continental margin (2012)
    PANGAEA
    In:  Supplement to: Bogus, Kara A; Zonneveld, Karin A F; Fischer, David; Kasten, Sabine; Bohrmann, Gerhard; Versteegh, Gerard J M (2012): The effect of meter-scale lateral oxygen gradients at the sediment-water interface on selected organic matter based alteration, productivity and temperature proxies. Biogeosciences, 9, 1553-1570, https://doi.org/10.5194/bg-9-1553-2012
    Details
    Publication Date: 2023-03-03
    Description: A valid assessment of selective aerobic degradation on organic matter (OM) and its impact on OM-based proxies is vital to produce accurate environmental reconstructions. However, most studies investigating these effects suffer from inherent environmental heterogeneities. In this study, we used surface samples collected along two meter-scale transects and one longer transect in the northeastern Arabian Sea to constrain initial OM heterogeneity, in order to evaluate selective aerobic degradation on temperature, productivity and alteration indices at the sediment-water interface. All of the studied alteration indices, the higher plant alkane index, alcohol preservation index, and diol oxidation index, demonstrated that they are sensitive indicators for changes in the oxygen regime. Several export production indices, a cholesterol-based stanol/stenol index and dinoflagellate lipid- and cyst-based ratios, showed significant (more than 20%) change only over the lateral oxygen gradients. Therefore, these compounds do not exclusively reflect surface water productivity, but are significantly altered after deposition. Two of the proxies, glycerol dibiphytanyl glycerol tetraether-based TEX86 sea surface temperature indices and indices based on phytol, phytane and pristane, did not show any trends related to oxygen. Nevertheless, unrealistic sea surface temperatures were obtained after application of the TEX86, TEX86L, and TEX86H proxies. The phytol-based ratios were likely affected by the sedimentary production of pristane. Our results demonstrate the selective impact of aerobic organic matter degradation on the lipid and palynomorph composition of surface sediments along a short lateral oxygen gradient and suggest that some of the investigated proxies may be useful tracers of changing redox conditions at the sediment-water interface.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 10 datasets
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  • 5
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    Hydrocarbon analyses of submarine mud volcanoes (MV) in the Kumano forearc basin (2014)
    PANGAEA
    In:  Supplement to: Pape, Thomas; Geprägs, Patrizia; Hammerschmidt, Sebastian; Wintersteller, Paul; Wei, Jiangong; Fleischmann, Timo; Bohrmann, Gerhard; Kopf, Achim J (2014): Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone. Geochemistry, Geophysics, Geosystems, 15(6), 2180-2194, https://doi.org/10.1002/2013GC005057
    Details
    Publication Date: 2023-03-03
    Description: Twelve submarine mud volcanoes (MV) in the Kumano forearc basin within the Nankai Trough subduction zone were investigated for hydrocarbon origins and fluid dynamics. Gas hydrates diagnostic for methane concentrations exceeding solubilities were recovered from MVs 2, 4, 5, and 10. Molecular ratios (C1/C2〈250) and stable carbon isotopic compositions (d13C-CH4 〉-40 per mil V-PDB) indicate that hydrate-bound hydrocarbons (HCs) at MVs 2, 4, and 10 are derived from thermal cracking of organic matter. Considering thermal gradients at the nearby IODP Sites C0009 and C0002, the likely formation depth of such HCs ranges between 2300 and 4300 m below seafloor (mbsf). With respect to basin sediment thickness and the minimum distance to the top of the plate boundary thrust we propose that the majority of HCs fueling the MVs is derived from sediments of the Cretaceous to Tertiary Shimanto belt below Pliocene/Pleistocene to recent basin sediments. Considering their sizes and appearances hydrates are suggested to be relicts of higher MV activity in the past, although the sporadic presence of vesicomyid clams at MV 2 showed that fluid migration is sufficient to nourish chemosynthesis-based organisms in places. Distributions of dissolved methane at MVs 3, 4, 5, and 8 pointed at fluid supply through one or few MV conduits and effective methane oxidation in the immediate subsurface. The aged nature of the hydrates suggests that the major portion of methane immediately below the top of the methane-containing sediment interval is fueled by current hydrate dissolution rather than active migration from greater depth.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 31 datasets
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  • 6
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    In-situ sediment temperature and pore water chloride concentration at pockmarks of the Nigerian continental margin (2015)
    PANGAEA
    In:  Supplement to: Wei, Jiangong; Pape, Thomas; Sultan, Nabil; Colliat, Jean-Louis; Himmler, Tobias; Ruffine, Livio; de Prunelé, Alexis; Dennielou, Bernard; Garziglia, Sebastien; Marsset, Tania; Peters, Carl A; Rabiu, Abdulkarim; Bohrmann, Gerhard (2015): Gas hydrate distributions in sediments of pockmarks from the Nigerian margin – Results and interpretation from shallow drilling. Marine and Petroleum Geology, 59, 359-370, https://doi.org/10.1016/j.marpetgeo.2014.09.013
    Details
    Publication Date: 2023-03-03
    Description: A joint research expedition between the French IFREMER and the German MARUM was conducted in 2011 using the R/V 'Pourquoi pas?' to study gas hydrate distributions in a pockmark field (1141-1199 m below sea surface) at the continental margin of Nigeria. The seafloor drill rig MeBo of MARUM was used to recover sediments as deep as 56.74 m below seafloor. The presence of gas hydrates in specific core sections was deduced from temperature anomalies recorded during continuous records of infrared thermal scanning and anomalies in pore water chloride concentrations. In situ sediment temperature measurements showed elevated geothermal gradients of up to 258 °C/km in the center of the so-called pockmark A which is up to 4.6 times higher than that in the background sediment (72 °C/km). The gas hydrate distribution and thermal regime in the pockmark are largely controlled by the intensity, periodicity and direction of fluid flow. The joint interaction between fluid flow, gas hydrate formation and dissolution, and the thermal regime governs pockmark formation and evolution on the Nigerian continental margin.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 13 datasets
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  • 7
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    Seafloor images along 14 ROV profiles during METEOR cruise M114/2 (2016)
    PANGAEA
    Details
    Publication Date: 2023-03-03
    Description: Complete Data set of ROV postition data, onboard CTD data, underwater photos and underwater videos that were produced with ROV MARUM-Quest during Meteor Expedition M114/2. Data set organized as a single folder for each dive.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 14 datasets
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  • 8
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    Temperature, chloride and sulfate measurements of samples from RV METEOR cruise M112 (2017)
    PANGAEA
    In:  Supplement to: Loher, Markus; Pape, Thomas; Marcon, Yann; Römer, Miriam; Wintersteller, Paul; Praeg, Daniel; Torres, Marta E; Sahling, Heiko; Bohrmann, Gerhard (2018): Mud extrusion and ring-fault gas seepage – upward branching fluid discharge at a deep-sea mud volcano. Scientific Reports, 8, 6275, https://doi.org/10.1038/s41598-018-24689-1
    Details
    Publication Date: 2023-03-03
    Description: Submarine mud volcanoes release sediments and gas-rich fluids at the seafloor via deeply-rooted plumbing systems that remain poorly understood. Here the functioning of Venere mud volcano, on the Calabrian accretionary prism in ~1,600 m water depth is investigated, based on multi-parameter hydroacoustic and visual seafloor data obtained using ship-borne methods, ROVs, and AUVs. Two seepage domains are recognized: mud breccia extrusion from a summit, and hydrocarbon venting from peripheral sites, hosting chemosynthetic ecosystems and authigenic carbonates indicative of long-term seepage. Pore fluids in freshly extruded mud breccia (up to 13 °C warmer than background sediments) contained methane concentrations exceeding saturation by 2.7 times and chloride concentrations up to five times lower than ambient seawater. Gas analyses indicate an underlying thermogenic hydrocarbon source with potential admixture of microbial methane during migration along ring faults to the peripheral sites. The gas and pore water analyses point to fluids sourced deep (〉3 km) below Venere mud volcano. An upward-branching plumbing system is proposed to account for co-existing mud breccia extrusion and gas seepage via multiple surface vents that influence the distribution of seafloor ecosystems. This model of mud volcanism implies that methane-rich fluids may be released during prolonged phases of moderate activity.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 26 datasets
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  • 9
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    Alkanes in fresh surface asphalts (2018)
    PANGAEA
    In:  Supplement to: Rubin-Blum, Maxim; Antony, Chakkiath Paul; Borowski, Christian; Sayavedra, Lizbeth; Pape, Thomas; Sahling, Heiko; Bohrmann, Gerhard; Kleiner, Manuel; Redmond, Molly C; Valentine, D L; Dubilier, Nicole (2017): Short-chain alkanes fuel mussel and sponge Cycloclasticus symbionts from deep-sea gas and oil seeps. Nature Microbiology, 2, 17093, https://doi.org/10.1038/nmicrobiol.2017.93
    Details
    Publication Date: 2023-03-03
    Description: Cycloclasticus bacteria are ubiquitous in oil-rich regions of the ocean and are known for their ability to degrade polycyclic aromatic hydrocarbons (PAHs). In this study, we describe Cycloclasticus that have established a symbiosis with Bathymodiolus heckerae mussels and poecilosclerid sponges from asphalt-rich, deep-sea oil seeps at Campeche Knolls in the southern Gulf of Mexico. Genomic and transcriptomic analyses revealed that, in contrast to all previously known Cycloclasticus, the symbiotic Cycloclasticus appears to lack the genes needed for PAH degradation. Instead, these symbionts use propane and other short-chain alkanes such as ethane and butane as carbon and energy sources, thus expanding the limited range of substrates known to power chemosynthetic symbioses. Analyses of short-chain alkanes in the environment of the Campeche Knolls symbioses revealed that these are present at high concentrations (in the μM to mM range). Comparative genomic analyses revealed high similarities between the genes used by the symbiotic Cycloclasticus to degrade short-chain alkanes and those of free-living Cycloclasticus that bloomed during the Deepwater Horizon oil spill. Our results indicate that the metabolic versatility of bacteria within the Cycloclasticus clade is higher than previously assumed, and highlight the expanded role of these keystone species in the degradation of marine hydrocarbons.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
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    Geochemistry of seep carbonates and of hydrocarbons entrapped in carbonates and in adjacent vent gases (2018)
    PANGAEA
    In:  Supplement to: Blumenberg, Martin; Pape, Thomas; Seifert, Richard; Bohrmann, Gerhard; Schlömer, Stefan (2018): Can hydrocarbons entrapped in seep carbonates serve as gas geochemistry recorder? Geo-Marine Letters, 38(2), 121-129, https://doi.org/10.1007/s00367-017-0522-6
    Details
    Publication Date: 2023-03-03
    Description: The geochemistry of seep gases is useful for an understanding of the local petroleum system. Here it was tested whether individual light hydrocarbons in seep gases are representatively entrapped in authigenic carbonates that formed near active seep sites. If applicable, it would be possible to extract geochemical information not only on the origin but also on the thermal maturity of the hydrocarbon source rocks from the gases entrapped in carbonates in the past. Respective data could be used for a better understanding of paleoenvironments and might directly serve as calibration point for, amongst others, petroleum system modeling. For this approach, (sub)-recent seep carbonates from the Black Sea (Paleodnjepr region and Batumi seep area), two sites of the Campeche Knoll region in the Gulf of Mexico, and the Venere mud volcano (Mediterranean Sea) were selected. These seep carbonates derive from sites for which geochemical data on the currently seeping gases exist. During treatment with phosphoric acid, methane and higher hydrocarbons were released from all carbonates, but in low concentrations. Compositional studies demonstrate that the ratio of methane to the sum of higher hydrocarbons (C1/(C2+C3)) is (partly strongly) positively biased in the entrapped gas fraction. δ13C values of C1 were determined for all samples and, for the samples from the Gulf of Mexico and the Mediterranean Sea, also of C2 and C3. The present dataset from six seep sites indicates that information on the seeped methane can be—although with a scatter of several permil—recorded in seep carbonate matrices, but other valuable information like the composition and δ13C of ethane and propane appears to be modified or lost during, for example, enclosure or at an early stage of diagenesis.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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