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ORIGIN AND ALTERATION OF ORGANIC MATTER IN HYDRATE-BEARING SEDIMENTS OF THE RIO GRANDE CONE, BRAZIL: EVIDENCE FROM BIOLOGICAL, PHYSICAL, AND CHEMICAL FACTORS

  • Luiz F Rodrigues (a1) (a2), Kita D Macario (a1), Roberto M Anjos (a1), João M M Ketzer (a2) (a3), Anderson J Maraschin (a2), Adolpho H Augustin (a2), Vinicius N Moreira (a1), Victor H J M dos Santos (a2), Marcelo C Muniz (a1), Renan P Cardoso (a1), Adriano R Viana (a4) and Dennis J Miller (a5)...

Abstract

The Rio Grande Cone is a major fanlike depositional feature in the continental slope of the Pelotas Basin, Southern Brazil. Two representative sediment cores collected in the Cone area were retrieved using a piston core device. In this work, the organic matter (OM) in the sediments was characterized for a continental vs. marine origin using chemical proxies to help constrain the origin of gas in hydrates. The main contribution of OM was from marine organic carbon based on the stable carbon isotope (δ13C-org) and total organic carbon/total nitrogen ratio (TOC:TN) analyses. In addition, the 14C data showed important information about the origin of the OM and we suggest some factors that could modify the original organic matter and therefore mask the “real” 14C ages: (1) biological activity that could modify the carbon isotopic composition of bulk terrestrial organic matter values, (2) the existence of younger sediments from mass wasting deposits unconformably overlying older sediments, and (3) the deep-sediment-sourced methane contribution due to the input of “old” (>50 ka) organic compounds from migrating fluids.

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Corresponding author

*Corresponding author. Email: frederico.rodrigues@pucrs.br.

References

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Berner, RA. 1981. A new geochemical classification of sedimentary environments. Journal of Sedimentary Research 51(2):359365.
Blair, NE, Aller, RC. 2012. The fate of terrestrial organic carbon in the marine environment. Annual Review of Marine Science 4(1):401423. doi: 10.1146/annurev-marine-120709-142717.
Burdige, DJ. 2005. Burial of terrestrial organic matter in marine sediments: A re-assessment. Global Biogeochemical Cycles 19(4):17. doi: 10.1029/2004GB002368.
Coffin, RB, Hamdan, LJ, Smith, JP, Rose, PS, Plummer, RE, Yoza, B, Pecher, I, Montgomery, MT. 2014. Contribution of vertical methane flux to shallow sediment carbon pools across Porangahau Ridge, New Zealand. Energies 7(8):53325356. doi: 10.3390/en7085332.
Coffin, R, Hamdan, L, Plummer, R, Smith, J, Gardner, J, Hagen, R, Wood, W. 2008. Analysis of methane and sulfate flux in methane-charged sediments from the Mississippi Canyon, Gulf of Mexico. Marine and Petroleum Geology 25(9):977987. doi: 10.1016/j.marpetgeo.2008.01.014.
Dickens, AF, Gélinas, Y, Masiello, C, Wakeham, S, Hedges, JI. 2004. Reburial of fossil organic carbon in marine sediments. Nature 427(6972):336339. doi: 10.1038/nature02299.
Eglinton, TI, Aluwihare, I, Bauer, JE, Druffel, ERM, McNichol, AP. 1996. Gas chromatographic isolation of individual compounds from complex matrices for radiocarbon dating. Analytical Chemistry 68(5):904912. doi: 10.1021/ac9508513.
Ericson, DB, Goesta, W. 1968. Pleistocene climates and chronology in deep-sea sediments. Science 162(3859):1227–&.
Freire, AFM, Monteiro, MC. 2013. A novel approach for inferring the proportion of terrestrial organic matter input to marine sediments on the basis of TOC:TN and a novel approach for inferring the proportion of terrestrial organic matter input to marine sediments on the basis of TOC:TN. Open Journal of Marine Science 3(2):7492. doi: 10.4236/ojms.2013.32009.
Freudenthal, T, Wagner, T, Wenzhöfer, F, Zabel, M, Wefer, G. 2001. Early diagenesis of organic matter from sediments of the eastern subtropical Atlantic: Evidence from stable nitrogen and carbon isotopes. Geochimica et Cosmochimica Acta 65(11):17951808. doi: 10.1016/S0016-7037(01)00554-3.
Hedges, JI. 1992. Global biogeochemical cycles: Progress and problems. Marine Chemistry 39 (1–3):6793. doi: 10.1016/0304-4203(92)90096-S.
Hedges, JI, Parker, P L. 1976. Land-derived organic matter in surface sediments from the Gulf of Mexico. Geochimica et Cosmochimica Acta 40(9):10191029.
Hernández-Molina, FJ, Soto, M, Piola, AR, Tomasini, J, Preu, B, Thompson, P, Badalini, G, Creaser, A,., Violante, RA, Morales, E, Paterlini, M, Santa Ana, HD. 2016. A contourite depositional system along the Uruguayan continental margin: Sedimentary, oceanographic and paleoceangraphic implications. Marine and Petroleum Geology 378:333349. doi: 10.1016/j.margeo.2015.10.008
Lamb, AL, Wilson, GP, Leng, MJ. 2006. A review of coastal palaeoclimate and relative sea-level reconstructions using d13C and C/N ratios in organic material. Earth-Science Reviews 75:2957.
Martins, LR, Urien, CM, Martins, IR. 2005. Gênese dos sedimentos da plataforma continental Atlântica entre o Rio Grande do Sul (Brasil) e Tierra Del Fuego (Argentina). Gravel 3:85102.
Matsumoto, R, Ryu, BJ, Lee, SR, Lin, S, Wu, S, Sain, K, Pecher, I, Riedel, M. 2011. Occurrence and exploration of gas hydrate in the marginal seas and continental margin of the Asia and Oceania region. Marine and Petroleum Geology 28(10):17511767.
Mayer, LM. 1994. Surface area control of organic carbon accumulation in continental shelf sediments. Geochimica et Cosmochimica Acta 58(4):12711284. doi: 10.1016/0016-7037(94)90381-90386.
Meyers, PA. 1997. Organic geochemical proxies of paleoceanographic, plaeolimnologic and plaeoclimatic processes. Organic Geochemistry 27(5):213250.
Milani, EJ, Brandão, JASL, Zalán, PV, Gamboa, LAP. 2000. Petróleo na margem continental Brasileira: Geologia, Exploração, resultados e perspectivas. Revista Brasileira de Geofísica 18(3):352396. doi: 10.1590/S0102-261X2000000300012.
Miller, DJ, Ketzer, JM, Viana, AR, Kowsmann, RO, Freire, AFM, Oreiro, SG, Augustin, AH. 2015. Natural gas hydrates in the Rio Grande Cone (Brazil): A new province in the western South Atlantic. Marine and Petroleum Geology 67:187196. doi: 10.1016/j.marpetgeo.2015.05.012.
Petrobras, Petróleo Brasileiro, S A / Centro de Pesquisas Leopoldo Américo Miguez de Mello/Instituto do Petróleo e Recursos Naturais. 2011. Posicionamento Cronoestratigráfico das Amostras Dos Testemunhos PC-31 E PC-51 (Campanha MR11), Localizados No Cone de Rio Grande, Com Base Em Foraminíferos Planctônicos. Internal Report, 14.
Pohlman, JW, Bauer, JE, Canuel, EA, Grabowski, KS, Knies, DL, Mitchell, CS, Whiticar, MJ, Coffin, RB. 2009. Methane sources in gas hydrate-bearing cold seeps: Evidence from radiocarbon and stable isotopes. Marine Chemistry 115(1–2):102109. doi: 10.1016/j.marchem.2009.07.001.
Pohlman, JW, Bauer, JE, Waite, WF, Osburn, CL, Chapman, NR. 2011. Methane hydrate-bearing seeps as a source of aged dissolved organic carbon to the oceans. Nature Geoscience 4(1):3741. doi: 10.1038/ngeo1016.
Raymond, PA, Bauer, JE. 2001. Use of 14C and 13C natural abundances for evaluating riverine, estuarine, and coastal DOC and POC sources and cycling: A review and synthesis. Organic Geochemistry 32(4):469485. doi: 10.1016/S0146-6380(00)00190-X.
Rodrigues, LF, Ketzer, JM, Lourega, RV, Augustin, AH, Sbrissa, G, Miller, D, Heemann, R, Viana, A, Freire, AFM, Morad, S. 2017. The influence of methane fluxes on the sulfate/methane interface in sediments from the Rio Grande cone gas hydrate province, southern Brazil. Brazilian Journal of Geology 47(3):369381. doi: 10.1590/2317-4889201720170027.
Sassen, R, MacDonald, IR, Guinasso, NL, Joye, S, Requejo, AG, Sweet, ST, Alcalá-Herrera, J, DeFreitas, DA, Schink, DR. 1998. Bacterial methane oxidation in sea-floor gas hydrate: Significance to life in extreme environments. Geology 26(9):851854.
Silveira, DPT, Machado, MAP. 2004. Bacias Sedimentares Brasileiras: Bacia de Pelotas. Phoenix, Série Bacias Sedimentares 63:16.
Viana, AR. 2001. Seismic expression of shallow- to deep-water contourites along the south-eastern Brazilian margin. Marine Geophysical Researches 22(5/6):509521. doi: 10.1023/A:1016307918182.
Vicalvi, MA. 1999. Zoneamento bioestratigráfico e paleoclimático do quaternário superior do Talude da Bacia de Campos e Platô de São Paulo adjacente, com base em foraminíferos planctônicos. Anuário do Instituto de Geociências 22:117–19.
Wilson, GP, Lamb, AL, Leng, MJ, Gonzalez, S, Huddart, D. 2005. Variability of organic δ13C and C/N in the Mersey Estuary, UK and its implications for sea-level reconstruction studies. Estuarine, Coastal and Shelf Science 64(4):685698.

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