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  • 1.
    Rodrigues, Luiz F
    et al.
    Universidade Federal Fluminense, Brazil;Pontifícia Universidade Católica do Rio Grande do Sul, Brazil.
    Macario, Kita D
    Universidade Federal Fluminense, Brazil.
    Anjos, Roberto M
    Universidade Federal Fluminense, Brazil.
    Ketzer, João Marcelo
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Pontifícia Universidade Católica do Rio Grande do Sul, Brazil.
    Maraschin, Anderson J
    Pontifícia Universidade Católica do Rio Grande do Sul, Brazil.
    Augustin, Adolpho H
    Pontifícia Universidade Católica do Rio Grande do Sul, Brazil.
    Moreira, Vinicius N
    Universidade Federal Fluminense, Brazil.
    dos Santos, Victor H.J.M.
    Pontifícia Universidade Católica do Rio Grande do Sul, Brazil.
    Muniz, Marcelo C
    Universidade Federal Fluminense, Brazil.
    Cardoso, Renan P
    Universidade Federal Fluminense, Brazil.
    Viana, Adriano R
    Petrobras, Brazil.
    Miller, Dennis J
    Petrobras, Brazil.
    Origin and alteration of organic matter in hydrate-bearing sediments of the Rio Grande Cone, Brazil: evidence from biological, physical, and chemical factors.2020In: Radiocarbon, ISSN 0033-8222, E-ISSN 1945-5755, Vol. 62, no 1, p. 197-206Article in journal (Refereed)
    Abstract [en]

    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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