FN Archimer Export Format
PT J
TI Gravity complexes as a focus of seafloor fluid seepage: the Rio Grande Cone, SE Brazil
BT 
AF Ketzer, M.
   Praeg, D.
   Augustin, A. H.
   Rodrigues, L. F.
   Steiger, A. K.
   Rahmati-Abkenar, M.
   Viana, A. R.
   Miller, D. J.
   Malinverno, A.
   Dickens, G. R.
   Cupertino, J. A.
AS 1:1;2:2;3:3;4:4;5:3;6:1;7:5;8:5;9:6;10:7;11:3;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 Department of Biology and Environmental Science, Linnaeus University, 391 81, Kalmar, Sweden
   Géoazur, 250 Rue Albert Einstein, 06560, Valbonne, France
   Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, 91619-900, Brazil
   Universidade Federal do Rio Grande, Rio Grande, 96203-900, Brazil
   Petrobras Petroleo Brasileiro SA, Rio de Janeiro, 20031-170, Brazil
   Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA
   Trinity College Dublin, Dublin 2, Ireland
C2 UNIV LINNAEUS, SWEDEN
   UNIV NICE, FRANCE
   UNIV CATOLIC RIO GRANDE DO SUL, BRAZIL
   UNIV FED RIO GRANDE, BRAZIL
   PETROBRAS SA, BRAZIL
   UNIV COLUMBIA, USA
   TRINITY COLL DUBLIN, IRELAND
IN DOAJ
IF 4.6
TC 2
UR https://archimer.ifremer.fr/doc/00829/94110/101243.pdf
   https://archimer.ifremer.fr/doc/00829/94110/101244.pdf
   https://archimer.ifremer.fr/doc/00829/94110/101245.pdf
   https://archimer.ifremer.fr/doc/00829/94110/101246.xlsx
   https://archimer.ifremer.fr/doc/00829/94110/101247.xlsx
   https://archimer.ifremer.fr/doc/00829/94110/101248.xlsx
LA English
DT Article
CR MD 195 / CONEGAS-2
BO Marion Dufresne
AB Seafloor methane emissions can affect Earth’s climate and ocean chemistry. Vast quantities of methane formed by microbial decomposition of organic matter are locked within gas hydrate and free gas on continental slopes, particularly in large areas with high sediment accumulations such as deep-sea fans. The release of methane in slope environments has frequently been associated with dissociation of gas hydrates near the edge of the gas hydrate stability zone on the upper slope, with discharges in greater water depths less understood. Here we show, using data from the Rio Grande Cone (western South Atlantic), that the intrinsic, gravity-induced downslope collapse of thick slope sediment accumulations creates structures that serve as pathways for gas migration, unlocking methane and causing seafloor emissions via giant gas flares in the water column. The observed emissions in the study region (up to 310 Mg year−1) are three times greater than estimates for the entire US North Atlantic margin and reveal the importance of collapsing sediment accumulations for ocean carbon cycling. Similar outgassing systems on the Amazon and Niger fans suggest that gravity tectonics on passive margins is a common yet overlooked mechanism driving massive seafloor methane emissions in sediment-laden continental slopes. 
PY 2023
PD MAR
SO Scientific Reports
SN 2045-2322
PU Springer Science and Business Media LLC
VL 13
IS 1
UT 001023921200039
DI 10.1038/s41598-023-31815-1
ID 94110
ER

EF