caa a22 4500 463216253 CHVBK 20180405153157.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00367-007-0072-4 doi (NATIONALLICENCE)springer-10.1007/s00367-007-0072-4 Strong heat flow variability in an active shallow gas environment, Dnepr palaeo-delta, Black Sea [Elektronische Daten] [J. Poort, R. Kutas, J. Klerkx, S. Beaubien, S. Lombardi, L. Dimitrov, A. Vassilev, L. Naudts] The Dnepr palaeo-delta on the north-western continental slope of the Black Sea is a prolific seepage zone characterised by a highly variable heat flow ranging from 24 to 88mW/m2. New thermal data were collected at 33 closely spaced stations in order to better understand the apparent relation between heat flow variability and seepage features. Strong relief gradients and associated landslide shaping may explain first-order heat flow variability but, locally, thermal parameters appear to be controlled by fluid and gas migrations. High heat flow anomalies are found at sites where faults and diapirs offer pathways for warm fluid flow from deeper sedimentary levels. Low heat flow is most strongly expressed at ridge crests near seepage sites but is also found where seeps are absent. Reduced heat flow and nonlinear temperature-depth variations are interpreted to result from natural or induced gas ebullition of saturated shallow gas covered by a thin, relatively impermeable sedimentary seal. The presence of sealed gas pockets, in particular at ridge crests, is supported by methane pore-water analysis and a shallow gas front widely observed in the study area. Springer-Verlag, 2007 Poort J. Renard Centre of Marine Geology (RCMG), Universiteit Gent, Krijgslaan 281 s8, 9000, Gent, Belgium aut Kutas R. Institute of Geophysics, National Academy of Science of Ukraine, 32 Palladin Ave., 03680, 142, Kiev, Ukraine aut Klerkx J. International Bureau for Environmental Studies (IBES), Audrey Hepburnstraat 9/13, 1090, Brussels, Belgium aut Beaubien S. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, Italy aut Lombardi S. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, Italy aut Dimitrov L. Institute of Oceanology (IOS), Bulgarian Academy of Sciences, P.O. Box 152, 9000, Varna, Bulgaria aut Vassilev A. Institute of Oceanology (IOS), Bulgarian Academy of Sciences, P.O. Box 152, 9000, Varna, Bulgaria aut Naudts L. Renard Centre of Marine Geology (RCMG), Universiteit Gent, Krijgslaan 281 s8, 9000, Gent, Belgium aut Geo-Marine Letters Springer-Verlag 27/2-4(2007-06-01), 185-195 0276-0460 27:2-4<185 2007 27 367 https://doi.org/10.1007/s00367-007-0072-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00367-007-0072-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Poort J. Renard Centre of Marine Geology (RCMG), Universiteit Gent, Krijgslaan 281 s8, 9000, Gent, Belgium aut NATIONALLICENCE 700 1- Kutas R. Institute of Geophysics, National Academy of Science of Ukraine, 32 Palladin Ave., 03680, 142, Kiev, Ukraine aut NATIONALLICENCE 700 1- Klerkx J. International Bureau for Environmental Studies (IBES), Audrey Hepburnstraat 9/13, 1090, Brussels, Belgium aut NATIONALLICENCE 700 1- Beaubien S. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, Italy aut NATIONALLICENCE 700 1- Lombardi S. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, Italy aut NATIONALLICENCE 700 1- Dimitrov L. Institute of Oceanology (IOS), Bulgarian Academy of Sciences, P.O. Box 152, 9000, Varna, Bulgaria aut NATIONALLICENCE 700 1- Vassilev A. Institute of Oceanology (IOS), Bulgarian Academy of Sciences, P.O. Box 152, 9000, Varna, Bulgaria aut NATIONALLICENCE 700 1- Naudts L. Renard Centre of Marine Geology (RCMG), Universiteit Gent, Krijgslaan 281 s8, 9000, Gent, Belgium aut NATIONALLICENCE 773 0- Geo-Marine Letters Springer-Verlag 27/2-4(2007-06-01), 185-195 0276-0460 27:2-4<185 2007 27 367 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer