FN Archimer Export Format
PT J
TI High rates of organic carbon burial in submarine deltas maintained on geological timescales
BT 
AF HAGE, Sophie
   Romans, Brian
   Peploe, Thomas
   Poyatos-Moré, Miquel
   Haeri Ardakani, Omid
   Bell, Daniel
   Englert, Rebecca
   Kaempfe-Droguett, Sebastian
   Nesbit, Paul
   Sherstan, Georgia
   Synnott, Dane
   Hubbard, Stephen
AS 1:1,2,6;2:3;3:1;4:4;5:1,5;6:1;7:1;8:3;9:1;10:1;11:1;12:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;
C1 Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
   Geo-Ocean, Univ. Brest, CNRS, Ifremer, Finistère, France
   Department of Geosciences, Virginia Tech, Blacksburg, VA, USA
   Departament de Geologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
   Natural Resources Canada, Geological Survey of Canada, Calgary, Alberta, Canada
   Geo-Ocean, Univ. Brest, CNRS, Ifremer, Finistère, France
C2 UNIV CALGARY, CANADA
   IFREMER, FRANCE
   VIRGINIA TECH, USA
   UNIV AUTONOMA BARCELONA, SPAIN
   GEOL SURVEY CANADA, CANADA
   UBO, FRANCE
SI BREST
SE PDG-REM-GEOOCEAN-ASTRE
UM GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 18.3
TC 3
UR https://archimer.ifremer.fr/doc/00799/91125/96872.pdf
LA English
DT Article
AB Burial of terrestrial organic carbon in marine sediments can draw down atmospheric CO2 levels on Earth over geologic timescales (≥105 yr). The largest sinks of organic carbon burial in present-day oceans lie in deltas, which are composed of three-dimensional sigmoidal sedimentary packages called clinothems, dipping from land to sea. Analysis of modern delta clinothems, however, provides only a snapshot of the temporal and spatial characteristics of these complex systems, making long-term organic carbon burial efficiency difficult to constrain. Here we determine the stratigraphy of an exhumed delta clinothem preserved in Upper Cretaceous (~75 million years ago) deposits in the Magallanes Basin, Chile, using field measurements and aerial photos, which was then combined with measurement of total organic carbon to create a comprehensive organic carbon budget. We show that the clinothem buried 93 ± 19 Mt terrestrial-rich organic carbon over a duration of 0.1–0.9 Myr. When normalized to the clinothem surface area, this represents an annual burial of 2.3–15.7 t km−2 yr−1 organic carbon, which is on the same order of magnitude as modern-day burial rates in clinothems such as the Amazon delta. This study demonstrates that deltas have been and will probably be substantial terrestrial organic carbon sinks over geologic timescales, a long-standing idea that had yet to be quantified. 
PY 2022
PD NOV
SO Nature Geoscience
SN 1752-0894
PU Nature
VL 15
IS 11
UT 000871290400001
BP 919
EP 924
DI 10.1038/s41561-022-01048-4
ID 91125
ER

EF