Does a strong pycnocline impact organic-matter preservation and accumulation in an anoxic setting? The case of the Orca Basin, Gulf of Mexico
作者： Nicolas Tribovillard , Viviane Bout-Roumazeilles , Thomas Sionneau , Jean Carlos Montero Serrano , Armelle Riboulleau
DOI: 10.1016/J.CRTE.2008.10.002
关键词:
摘要: The Orca Basin (an intraslope depression located in the Gulf of Mexico) collects sedimentary particles terrestrial origin (clastic and organic mainly supplied by Mississippi River) marine (biogenic productivity). basin is partly filled with dense brines leached from salt diapirs cropping out on sea floor, permanently stratified. A strong pycnocline induces anoxic bottom conditions, expectedly favorable to matter (OM) preservation. Here, we report OM upper 750 cm below floor Core MD02-2552 (Holocene). content dominated marine-derived amorphous OM. assemblage unexpectedly degraded some extent, which may be accounted for a relatively long residence time at halocline-pycnocline ∼2240 m. Thus are temporarily trapped kept contact dissolved oxygen-rich overlying water mass. Lastly, land-derived fraction shows co-variations clay mineral supply.
harvard.edu
em-consulte.com
elsevier.com参考文章(28)
K. Wallmann, G. Aloisi, M. Haeckel, A. Obzhirov, G. Pavlova, P. Tishchenko, Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments Geochimica et Cosmochimica Acta. ,vol. 70, pp. 3905- 3927 ,(2006) , 10.1016/J.GCA.2006.06.003
Lucia Roncaglia, Anton Kuijpers, Revision of the palynofacies model of Tyson (1993) based on recent high-latitude sediments from the North Atlantic Facies. ,vol. 52, pp. 19- 39 ,(2006) , 10.1007/S10347-005-0028-Y
Jean-Robert Disnar, Jérémy Jacob, Mayssa Morched-Issa, Nathalie Lottier, Fabien Arnaud, Assessment of peat quality by molecular and bulk geochemical analysis : Application to the Holocene record of the Chautagne marsh (Haute Savoie, France) Chemical Geology. ,vol. 254, pp. 101- 112 ,(2008) , 10.1016/J.CHEMGEO.2008.06.004
Thorarinn S Arnarson, Richard G Keil, None, Changes in organic matter-mineral interactions for marine sediments with varying oxygen exposure times Geochimica et Cosmochimica Acta. ,vol. 71, pp. 3545- 3556 ,(2007) , 10.1016/J.GCA.2007.04.027
Matthew T Hurtgen, Timothy W Lyons, Ellery D Ingall, Anna M Cruse, Anomalous enrichments of iron monosulfide in euxinic marine sediments and the role of H 2 S in iron sulfide transformations; examples from Effingham Inlet, Orca Basin, and the Black Sea American Journal of Science. ,vol. 299, pp. 556- 588 ,(1999) , 10.2475/AJS.299.7-9.556
Troy P. Sampere, Thomas S. Bianchi, Stuart G. Wakeham, Mead A. Allison, Sources of organic matter in surface sediments of the Louisiana Continental margin : Effects of major depositional/transport pathways and Hurricane Ivan computer science symposium in russia. ,vol. 28, pp. 2472- 2487 ,(2008) , 10.1016/J.CSR.2008.06.009
Nicolas-Pierre Tribovillard, Claude Largeau, Sylvie Derenne, Elisabeth Lallier-Verges, Mohammed Boussafir, Thierry Mongenot, Sulphur-rich organic matter from bituminous laminites of Orbagnoux (France, upper Kimmeridgian); the role of early vulcanization Bulletin De La Societe Geologique De France. ,vol. 168, pp. 331- 341 ,(1997)
R.V. TYSON, The "productivity versus preservation" controversy: cause, flaws, and resolution The Deposition of Organic-Carbon-Rich Sediments: Models, Mechanisms, and Consequences. ,(2005) , 10.2110/PEC.05.82.0017
B.J. Presley, I.R. Kaplan, Interstitial Water Chemistry: Deep Sea Drilling Project, Leg 4 U.S. Government Printing Office. ,(1970) , 10.2973/DSDP.PROC.04.120.1970
G. Deroo, F. Marquis, J. Espitalie, La pyrolyse Rock-Eval et ses applications. III Oil & Gas Science and Technology-revue De L Institut Francais Du Petrole. ,vol. 40, pp. 563- 784 ,(1985)