FN Archimer Export Format
PT J
TI Upward migration of gas in an active tectonic basin: an example from the Sea of Marmara
BT 
AF GRALL, Celine
   HENRY, Pierre
   DUPRE, Stephanie
   GELI, Louis
   SCALABRIN, Carla
   ZITTER, Tiphaine A. C.
   SENGOR, A. M. Celal
   CAGATAY, M. Namik
   CIFCI, Gunay
AS 1:1;2:2;3:3;4:3;5:3;6:4;7:5;8:5;9:6;
FF 1:;2:;3:PDG-REM-GM-LAD;4:PDG-REM-GM-LAD;5:PDG-REM-GM-LCG;6:;7:;8:;9:;
C1 Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA.
   Aix Marseille Univ, CNRS, IRD, INRA,Coll France,CEREGE, Aix En Provence, France.
   IFREMER, Marine Geosci Unit, Plouzane, France.
   ATGEO, Aix En Provence, France.
   Istanbul Tech Univ, Maden Fak, Jeol Bolumu, TR-34469 Istanbul, Turkey.
   Dokuz Eylul Univ, Izmir, Turkey.
C2 UNIV COLUMBIA, USA
   UNIV AIX MARSEILLE, FRANCE
   IFREMER, FRANCE
   ATGEO, FRANCE
   UNIV TECH ISTANBUL, TURKEY
   UNIV DOKUZ EYLUL, TURKEY
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GM-LCG
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.43
TC 10
UR https://archimer.ifremer.fr/doc/00445/55629/57264.pdf
LA English
DT Article
CR MARMESONET
   MARNAUT
BO Le Suroît
   L'Atalante
AB Gases of various sources were collected at the seafloor of the Marmara basin suggesting that the gases expelled have experienced multiple sequences of upward migration, from multiple sources. The pathways of upward migration of gas can be reconstructed by considering the distribution of gas seeps with respect to the near-surface geomorphostructure and the regional stratigraphic architecture of the Marmara Basin. Gas seeps appear to be more favourably localized within a 1–2 km swath around active faults where sediment permeability is probably enhanced by deformation. In the fault zones, fault intersections between sets of transtensive and transpressive subsidiary faults, or between subsidiary faults and main faults, are the preferred gas pathways. These subsidiary structures localize methane seeps, observed as elongated black patches with bacterial mats, gas bubble emission sites, and chemoherms associated with buried mud volcanoes. Gas seeps are, however, rare along active faults segments crossing basin depocenters but focus along basin edges and along topographic highs. Considering the role of sedimentary layers as gas migration pathways can explain this characteristic of the distribution of gas seeps. Fault zones that cross updip gas migration pathways will vent comparatively more gas than fault zones on the downdip side. Moreover, gas accumulation and resulting overpressuring along the western fault segment crossing the Western High may be associated with aseismic fault creep and intense gas emissions at the seafloor. In contrast, the poorly focused seepage along the fault segment crossing the Central High may be linked to the locked state of this fault segment. 
PY 2018
PD JUN
SO Deep-sea Research Part Ii-topical Studies In Oceanography
SN 0967-0645
PU Pergamon-elsevier Science Ltd
VL 153
UT 000449444700003
BP 17
EP 35
DI 10.1016/j.dsr2.2018.06.007
ID 55629
ER

EF