Browsing PANGAEA by Author "Bohrmann, Gerhard"

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Authigenic carbonate and barite mineralization in sediments of the Deryugin Basin (Sea of Okhotsk).

Derkachev, A N; Bohrmann, Gerhard; Greinert, Jens; Mozherovsky, A V (PANGAEA, 2000-06-06)

Results of studies of mineralogy, geochemistry, and isotope parameters (d13C, d34S, d180, and 87Sr/86Sr) of carbonates and barites from sediments of the Deryugin Basin in the Sea of Okhotsk are presented. Diagenetic nature ...
Authigenic carbonate precipitates from the NE Black Sea: a mineralogical, geochemical, and lipid biomarker study.

Bahr, André; Pape, Thomas; Bohrmann, Gerhard; Mazzini, Adriano; Haeckel, Matthias; Reitz, Anja; Ivanov, M (PANGAEA, 2009-07-21)
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.

Bahr, André; Pape, Thomas; Abegg, Friedrich; Bohrmann, Gerhard; van Weering, Tjeerd C E; Ivanov, M K (PANGAEA, 2010-11-22)

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 ...
Complex plumbing systems in the near subsurface: geometries of authigenic carbonates from Dolgovskoy Mound (Black Sea) constrained by analogue experiments.

Mazzini, Adriano; Ivanov, Michael K; Nermoen, Anders; Bahr, André; Bohrmann, Gerhard; Svensen, Henrik; Planke, Sverre (PANGAEA, 2008-11-09)

Targeted sampling on the Dolgovskoy Mound (northern Shatsky Ridge) revealed the presence of spectacular laterally extensive and differently shaped authigenic carbonates. The sampling stations were selected based on sidescan ...
Deep-water cold seeps, sedimentary environments and ecosystems of the Black and Tyrrhenian Seas and Gulf of Cadiz.

Kenyon, Neil H; Bohrmann, Gerhard (PANGAEA, 2008-10-30)
Evidence for the submarine weathering of silicate minerals in Black Sea sediments: possible implications for the marine Li and B cycles.

Bohrmann, Gerhard (PANGAEA, 2004-09-21)

The role of sediment diagenesis in the marine cycles of Li and B is poorly understood. Because Li and B are easily mobilized during burial and are consumed in authigenic clay mineral formation, their abundance in marine ...
Geological control and magnitude of methane ebullition from a high-flux seep area in the Black Sea - the Kerch seep area.

Römer, Miriam; Sahling, Heiko; Pape, Thomas; Bahr, André; Feseker, Tomas; Wintersteller, Paul; Bohrmann, Gerhard (PANGAEA, 2012-07-23)
High-intensity gas seepage causes rafting of shallow gas hydrates in the southeastern Black Sea.

Pape, Thomas; Bahr, André; Klapp, Stephan A; Abegg, Friedrich; Bohrmann, Gerhard (PANGAEA, 2011-08-15)

Submarine gas hydrates are a major global reservoir of the potent greenhouse gas methane. Since current assessments of worldwide hydrate-bound carbon vary by one order of magnitude, new technical efforts are required for ...
Hydrocarbon gases in deposits from mud volcanoes in the Sorokin Trough, northeatsern Black Sea.

Blinova, Valentina N; Ivanov, Michael; Bohrmann, Gerhard (PANGAEA, 2003-09-15)

Hydrocarbon gases were determined in sediments from three mud volcanoes in the Sorokin Trough. In comparison to a reference station outside the mud volcano area, the deposits are characterized by an enrichment of high-molecular ...
Massive barite deposits and carbonate mineralization in the Derugin Basin, Sea of Okhotsk: Precipitation process at cold vent sites.

Greinert, Jens; Bollwerk, S; Derkachev, A N; Bohrmann, Gerhard; Suess, Erwin (PANGAEA, 2002-09-07)

An area of massive barite precipitations was studied at a tectonic horst in 1500 m water depth in the Derugin Basin, Sea of Okhotsk. Seafloor observations and dredge samples showed irregular, block- to column-shaped barite ...
Methane discharge into the Black Sea and the global ocean via fluid flow through submarine mud volcanoes.

Wallmann, Klaus; Drews, Manuela; Aloisi, Giovanni; Bohrmann, Gerhard (PANGAEA, 2006-01-04)

During the MARGASCH cruise M52/1 in 2001 with RV Meteor we sampled surface sediments from three stations in the crater of the Dvurechenskii mud volcano (DMV, located in the Sorokin Trough of the Black Sea) and one reference ...
Molecular and isotopic partitioning of low-molecular-weight hydrocarbons during migration and gas hydrate precipitation in deposits of a high-flux seepage site.

Pape, Thomas; Bahr, André; Rethemeyer, Janet; Kessler, John D; Sahling, Heiko; Hinrichs, Kai-Uwe; Klapp, Stephan A; Reeburgh, William S; Bohrmann, Gerhard (PANGAEA, 2010-07-15)

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 ...
New insights into geology and geochemistry of the Kerch seep area in the Black Sea.

Pape, Thomas; Haeckel, Matthias; Bohrmann, Gerhard (PANGAEA, 2020-02-14)

Concentrations of methane (headspace gas) in gravity cores and mini cores from the Kerch Seep area, Black Sea.
Profile of sediment echo sounding during METEOR cruise M84/2 with links to Parasound data files.

Römer, Miriam; Sahling, Heiko; Pape, Thomas; Bahr, André; Feseker, Tomas; Wintersteller, Paul; Bohrmann, Gerhard (PANGAEA, 2012-07-26)

We investigated gas bubble emissions at the Don-Kuban paleo-fan in the northeastern Black Sea regarding their geological setting, quantities as well as spatial and temporal variabilities during three ship expeditions between ...
Report and preliminary results of R/V METEOR Cruise M72/3, Istanbul - Trabzon - Istanbul, 17 March - 23 April, 2007.

Bohrmann, Gerhard (PANGAEA, 2008-03-13)
Report and preliminary results of RV MARIA S. MERIAN Cruise MSM 15/2, Istanbul (Turkey) - Piraeus (Greece), 10 May - 2 June 2010. Origin and structure of methane, gas hydrates and fluid flows in the Black Sea.

Bohrmann, Gerhard; cruise participants (PANGAEA, 2011-08-23)
Report and preliminary results of RV METEOR Cruise M84/2, Istanbul - Istanbul, 26 February - 02 April, 2011.

Bohrmann, Gerhard; cruise participants (PANGAEA, 2011-11-21)
The thermal structure of the Dvurechenskii mud volcano and its implications for gas hydrate stability and eruption dynamics.

Feseker, Tomas; Pape, Thomas; Wallmann, Klaus; Klapp, Stephan A; Schmidt-Schierhorn, Friederike; Bohrmann, Gerhard (PANGAEA, 2009-09-27)

The sediment temperature distribution at mud volcanoes provides insights into their activity and into the occurrence of gas hydrates. If ambient pressure and temperature conditions are close to the limits of the gas hydrate ...
Vodyanitskii mud volcano, Sorokin Trough, Black Sea: Geological characterization and quantification of gas bubble streams.

Sahling, Heiko; Bohrmann, Gerhard; Artemov, Yuriy G; Bahr, André; Brüning, Markus; Klapp, Stephan A; Klaucke, Ingo; Kozlova, Elena; Nikolovska, Aneta; Pape, Thomas; Reitz, Anja; Wallmann, Klaus (PANGAEA, 2010-05-04)

Vodyanitskii mud volcano is located at a depth of about 2070 m in the Sorokin Trough, Black sea. It is a 500-m wide and 20-m high cone surrounded by a depression, which is typical of many mud volcanoes in the Black Sea. ...

Browsing PANGAEA by Author "Bohrmann, Gerhard"

Browsing PANGAEA by Author "Bohrmann, Gerhard"

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