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  • 2010-2014  (125)
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  • 1
    Online Resource
    Online Resource
    Sarcophaga of France (Diptera : Sarcophaidae). (2011)
    Sofia :Pensoft Publishers,
    Details
    Keywords: Sarcophaga-France. ; Sarcophagidae-France. ; Diptera-France. ; Electronic books.
    Description / Table of Contents: identification keys, b/w tabs, rich bibliography, b/w plates.
    Type of Medium: Online Resource
    Pages: 1 online resource (330 pages)
    Edition: 1st ed.
    ISBN: 9789546425881
    Series Statement: Pensoft Series Faunistica ; v.97
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=5165309
    DDC: 505
    Language: English
    Note: Intro -- CONTENTS -- Abbreviations used in the text, Figures and Plates -- Introduction -- Taxonomy and nomenclat ure -- List of species found in France -- Morphology -- Techniques -- Biology of the species -- Collecting -- LOCALITY DATA -- Distribution -- Conservation Status -- Keys for identification -- Locality records for Sarcophaga spp.in France -- Acknowledgments -- References -- Figures -- Plates -- Index to species in the Plates.
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  • 2
    Online Resource
    Online Resource
    GUINECO-MeBo - Expedition zur Untersuchung der Bildungsprozesse und Entwicklung submariner Pockmark-Strukturen in Sedimenten des Niger Deltas : Abschlussbericht zum Forschungsvorhaben : FS "POURQUOI PAS?" 6.11 - 8.12.2011 : Libreville - Libreville (2011)
    [Bremen] : Universität Bremen
    Details Availability
    Keywords: Forschungsbericht ; Niger ; Deltasediment ; Tiefseebohrung ; Gashydrate
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (150 Seiten, 9,57 MB) , Illustrationen, Diagramme
    URL: https://doi.org/10.2314/KXP:1668053721
    DOI: 10.2314/KXP:1668053721
    Language: German
    Note: Förderkennzeichen BMBF 03G0824A , Weiteren Autor dem Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Sprache der Zusammenfassung: Deutsch, Englisch
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  • 3
    Online Resource
    Online Resource
    Sediment and pore water chemistry of cores 214 and 755 recovered during Meteor M72/1 and Poseidon POS317/2 cruise, northwestern Black Sea, supplementary data to: Henkel, Susann; Mogollón, José M; Nöthen, Kerstin; Franke, Christine; Bogus, Kara; Robin, Eric; Bahr, André; Blumenberg, Martin; Pape, Thomas; Seifert, Richard; März, Christian; de Lange, Gert Jan; Kasten, Sabine (2012): Diagenetic barium cycling in Black Sea sediments - A case study for anoxic marine environments. Geochimica et Cosmochimica Acta, 88, 88-105 (2012)
    Details Availability
    Keywords: Datensammlung
    Description / Table of Contents: High-resolution sedimentary records of major and minor elements (Al, Ba, Ca, Sr, Ti), total organic carbon (TOC), and profiles of pore water constituents (SO42-, CH4, Ca2+, Ba2+, Mg2+, alkalinity) were obtained for two gravity cores (core 755, 501 m water depth and core 214, 1686 m water depth) from the northwestern Black Sea. The records were examined in order to gain insight into the cycling of Ba in anoxic marine sediments characterized by a shallow sulfate-methane transition (SMT) as well as the applicability of barite as a primary productivity proxy in such a setting. The Ba records are strongly overprinted by diagenetic barite (BaSO4) precipitation and remobilization; authigenic Ba enrichments were found at both sites at and slightly above the current SMT. Transport reaction modeling was applied to simulate the migration of the SMT during the changing geochemical conditions after the Holocene seawater intrusion into the Black Sea. Based on this, sediment intervals affected by diagenetic Ba redistribution were identified. Results reveal that the intense overprint of Ba and Baxs (Ba excess above detrital average) strongly limits its correlation to primary productivity. These findings have implications for other modern and ancient anoxic basins, such as sections covering the Oceanic Anoxic Events for which Ba is frequently used as a primary productivity indicator. Our study also demonstrates the limitations concerning the use of Baxs as a tracer for downward migrations of the SMT: due to high sedimentation rates at the investigated sites, diagenetic barite fronts are buried below the SMT within a relatively short period. Thus, 'relict' barite fronts would only be preserved for a few thousands of years, if at all.〈br〉〈br〉REFERENCE:〈br〉Blumenberg, Martin; Seifert, Richard; Kasten, Sabine; Bahlmann, E; Michaelis, Walter (2009): Euphotic zone bacterioplankton sources major bacteriohopanepolyols in the Holocene Black Sea. Geochimica et Cosmochimica Acta, 73(3), 750-766
    Type of Medium: Online Resource
    Pages: 4 Datasets , Format: application/zip
    URL: http://dx.doi.org/10.1594/PANGAEA.779906
    URL: http://nbn-resolving.de/urn:nbn:de:tib-10.1594/PANGAEA.7799063
    URN: urn:nbn:de:tib-10.1594/PANGAEA.7799063
    DOI: 10.1594/PANGAEA.779906
    Language: English
    Note: This dataset is supplement to doi:10.1016/j.gca.2012.04.021 , This dataset is cited by doi:10.1016/j.gca.2008.11.005
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  • 4
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    Hydrocarbons of cold seeps of the Black Sea offshore Georgia as indicators of subsurface source and maturity (2010)
    In:  [Talk] In: DGG-Tagung GeoDarmstadt 2010, 10.-13.10.2010, Darmstadt .
    Details
    Publication Date: 2013-12-19
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 5
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    Molecular and isotopic partitioning of low-molecular-weight hydrocarbons during migration and gas hydrate precipitation in deposits of a high-flux seepage site (2010)
    Elsevier
    In:  Chemical Geology, 269 (3/4). pp. 350-363.
    Details
    Publication Date: 2019-09-23
    Description: Detailed knowledge of the extent of post-genetic modifications affecting shallow submarine hydrocarbons fueled from the deep subsurface is fundamental for evaluating source and reservoir properties. We investigated gases from a submarine high-flux seepage site in the anoxic Eastern Black Sea in order to elucidate molecular and isotopic alterations of low-molecular-weight hydrocarbons (LMWHC) associated with upward migration through the sediment and precipitation of shallow gas hydrates. For this, near-surface sediment pressure cores and free gas venting from the seafloor were collected using autoclave technology at the Batumi seep area at 845 m water depth within the gas hydrate stability zone. Vent gas, gas from pressure core degassing, and from hydrate dissociation were strongly dominated by methane (〉 99.85 mol.% of ∑[C1–C4, CO2]). Molecular ratios of LMWHC (C1/[C2 + C3] 〉 1000) and stable isotopic compositions of methane (δ13C = − 53.5‰ V-PDB; D/H around − 175‰ SMOW) indicated predominant microbial methane formation. C1/C2+ ratios and stable isotopic compositions of LMWHC distinguished three gas types prevailing in the seepage area. Vent gas discharged into bottom waters was depleted in methane by 〉 0.03 mol.% (∑[C1–C4, CO2]) relative to the other gas types and the virtual lack of 14C–CH4 indicated a negligible input of methane from degradation of fresh organic matter. Of all gas types analyzed, vent gas was least affected by molecular fractionation, thus, its origin from the deep subsurface rather than from decomposing hydrates in near-surface sediments is likely. As a result of the anaerobic oxidation of methane, LMWHC in pressure cores in top sediments included smaller methane fractions [0.03 mol.% ∑(C1–C4, CO2)] than gas released from pressure cores of more deeply buried sediments, where the fraction of methane was maximal due to its preferential incorporation in hydrate lattices. No indications for stable carbon isotopic fractionations of methane during hydrate crystallization from vent gas were found. Enrichments of 14C–CH4 (1.4 pMC) in short cores relative to lower abundances (max. 0.6 pMC) in gas from long cores and gas hydrates substantiates recent methanogenesis utilizing modern organic matter deposited in top sediments of this high-flux hydrocarbon seep area.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.chemgeo.2009.10.009
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  • 6
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    Hydrocarbons of cold seeps of the Black Sea offshore Georgia as indicators of subsurface source and maturity (2010)
    In:  [Talk] In: AAPG European Region Annual Conference 2010, 17.-19.10.2010, Kiev, Ukraine .
    Details
    Publication Date: 2013-12-19
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 7
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    Sources of fluids and gases expelled at cold seeps offshore Georgia, eastern Black Sea (2011)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 75 (11). pp. 3250-3268.
    Details
    Publication Date: 2019-06-27
    Description: Four seep sites located within an -20 km2 area offshore Georgia (Batumi seep area, Pechori Mound, Iberia Mound, and Colkheti Seep) show characteristic differences with respect to element concentrations, and oxygen, hydrogen, strontium, and chlorine isotope signatures in pore waters, as well as impregnation of sediments with petroleum and hydrocarbon potential. All seep sites have active gas seepage, near surface authigenic carbonates and gas hydrates. Cokheti Seep, Iberia Mound, and Pechori Mound are characterized by oil-stained sediments and gas seepage decoupled from deep fluid advection and bottom water intrusion induced by gas bubble release. Pechori Mound is further characterized by deep fluid advection of lower salinity pore fluids. The Pechori Mound pore fluids are altered by mineral/water reactions at elevated temperatures (between 60 and 110°C) indicated by heavier oxygen and lighter chlorine isotope values, distinct Li and B enrichment, and K depletion. Strontium isotope ratios indicate that fluids originate from late Oligocene strata. This finding is supported by the occurrence of hydrocarbon impregnations within the sediments. Furthermore, light hydrocarbons and high molecular weight impregnates indicate a predominant thermogenic origin for the gas and oil at Pechori Mound, Iberia Mound, and Colkheti Seep. C15+ hydrocarbons at the oil seeps are allochtonous, whereas those at the Batumi seep area are autochthonous. The presence of oleanane, an angiosperm biomarker, suggests that the hydrocarbon source rocks belong to the Maikopian Formation. In summary, all investigated seep sites show a high hydrocarbon potential and hydrocarbons of Iberia Mound, Colkheti Seep, and Pechori Mound are predominantly of thermogenic origin. However, only at the latter seep site advection of deep pore fluids is indicated.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gca.2011.03.018
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  • 8
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    Distribution and abundance of gas hydrates in near-surface deposits of the Håkon Mosby Mud Volcano, SW Barents Sea (2011)
    AGU (American Geophysical Union)
    In:  Geochemistry, Geophysics, Geosystems, 12 (9). Q09009.
    Details
    Publication Date: 2019-07-08
    Description: 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 Hakon 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 pressure core degassing revealed gas-sediment ratios between 3.1 and 25.7, corresponding to hydrate concentrations of up to 21.3% of the pore volume. Hydrocarbon compositions and physicochemical conditions imply that gas hydrates incipiently crystallize as structure I hydrate, with a dissociation temperature of around 13.8 degrees C at this water depth. Based on numerous in situ measurements of the geothermal gradient in the seabed, pore water sulfate profiles and microbathymetric data, we show that the thickness of the GHSZ increases from less than 1 m at the warm center to around 47 m in the outer parts of the HMMV. We estimate the total mass of hydrate-bound methane stored at the HMMV to be about 102.5 kt, of which 2.8 kt are located within the morphological Unit I around the center and thus are likely to be dissociated in the course of a large eruption.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2011GC003575
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  • 9
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    Authigenic carbonates from the eastern Black Sea as an archive for shallow gas hydrate dynamics – results from the combination of CT imaging with mineralogical and stable isotope analyses (2010)
    Elsevier
    In:  Marine and Petroleum Geology, 27 (9). pp. 1819-1829.
    Details
    Publication Date: 2019-09-23
    Description: Authigenic carbonates associated with cold seeps provide valuable archives of changes in the long-term seepage activity. To investigate the role of shallow-buried hydrates on the seepage strength and fluid composition we analysed methane-derived carbonate precipitates from a high-flux hydrocarbon seepage area (“Batumi seep area”) located on the south-eastern Black Sea slope in ca. 850 m. In a novel approach, we combined computerized X-ray tomography (CT) with mineralogical and isotope geochemical methods to get additional insights into the three-dimensional internal structure of the carbonate build-ups. X-ray diffractometry revealed the presence of two different authigenic carbonate phases, i.e. pure aragonitic rims associated with vital microbial mats and high-Mg calcite cementing the hemipelagic sediment. As indicated by the CT images, the initial sediment has been strongly deformed, first plastic then brittle, leading to brecciation of the progressively cemented sediment. The aragonitic rims on the other hand, represent a presumably recent carbonate growth phase since they cover the already deformed sediment. The stable oxygen isotope signature indicates that the high-Mg calcite cement incorporated pore water mixed with substantial hydrate water amounts. This points at a dominant role of high gas/fluid flux from decomposing gas hydrates leading to the deformation and cementation of the overlying sediment. In contrast, the aragonitic rims do not show an influence of 18O-enriched hydrate water. The differences in δ18O between the presumably recent aragonite precipitates and the older high-Mg cements suggest that periods of hydrate dissociation and vigorous fluid discharge alternated with times of hydrate stability and moderate fluid flow. These results indicate that shallow-buried gas hydrates are prone to episodic decomposition with associated vigorous fluid flow. This might have a profound impact on the seafloor morphology resulting e.g. in the formation of carbonate pavements and pockmark-like structures but might also affect the local carbon cycle.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.marpetgeo.2010.08.005
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  • 10
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    Gas hydrates in shallow deposits of the Amsterdam mud volcano, Anaximander Mountains, Northeastern Mediterranean Sea (2010)
    Springer
    In:  Geo-Marine Letters, 30 (3-4). pp. 187-206.
    Details
    Publication Date: 2019-09-23
    Description: We investigated gas hydrate in situ inventories as well as the composition and principal transport mechanisms of fluids expelled at the Amsterdam mud volcano (AMV; 2,025 m water depth) in the Eastern Mediterranean Sea. Pressure coring (the only technique preventing hydrates from decomposition during recovery) was used for the quantification of light hydrocarbons in near-surface deposits. The cores (up to 2.5 m in length) were retrieved with an autoclave piston corer, and served for analyses of gas quantities and compositions, and pore-water chemistry. For comparison, gravity cores from sites at the summit and beyond the AMV were analyzed. A prevalence of thermogenic light hydrocarbons was inferred from average C1/C2+ ratios 〈35 and δ13C-CH4 values of −50.6‰. Gas venting from the seafloor indicated methane oversaturation, and volumetric gas–sediment ratios of up to 17.0 in pressure cores taken from the center demonstrated hydrate presence at the time of sampling. Relative enrichments in ethane, propane, and iso-butane in gas released from pressure cores, and from an intact hydrate piece compared to venting gas suggest incipient crystallization of hydrate structure II (sII). Nonetheless, the co-existence of sI hydrate can not be excluded from our dataset. Hydrates fill up to 16.7% of pore volume within the sediment interval between the base of the sulfate zone and the maximum sampling depth at the summit. The concave-down shapes of pore-water concentration profiles recorded in the center indicate the influence of upward-directed advection of low-salinity fluids/fluidized mud. Furthermore, the SO42− and Ba2+ pore-water profiles in the central part of the AMV demonstrate that sulfate reduction driven by the anaerobic oxidation of methane is complete at depths between 30 cm and 70 cm below seafloor. Our results indicate that methane oversaturation, high hydrostatic pressure, and elevated pore-water activity caused by low salinity promote fixing of considerable proportions of light hydrocarbons in shallow hydrates even at the summit of the AMV, and possibly also of other MVs in the region. Depending on their crystallographic structure, however, hydrates will already decompose and release hydrocarbon masses if sediment temperatures exceed ca. 19.3°C and 21.0°C, respectively. Based on observations from other mud volcanoes, the common occurrence of such temperatures induced by heat flux from below into the immediate subsurface appears likely for the AMV.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00367-010-0197-8
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