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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

Published online by Cambridge University Press:  02 September 2019

Luiz F Rodrigues Open the ORCID record for Luiz F Rodrigues [Opens in a new window] ,
Kita D Macario Open the ORCID record for Kita D Macario [Opens in a new window] ,
Roberto M Anjos ,
João M M Ketzer ,
Anderson J Maraschin ,
Adolpho H Augustin ,
Vinicius N Moreira ,
Victor H J M dos Santos ,
Marcelo C Muniz  and
Renan P Cardoso
...Show all authors
Luiz F Rodrigues*
Affiliation:
Instituto de Física, Universidade Federal Fluminense, Av. Gal Milton Tavares de Souza, s/no, Gragoatá, 24210-340, Niterói, RJ, Brazil Instituto do Petróleo e dos Recursos Naturais (IPR), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Av. Ipiranga, 6681–96J, 90619-900, Porto Alegre, Brazil
Kita D Macario
Affiliation:
Instituto de Física, Universidade Federal Fluminense, Av. Gal Milton Tavares de Souza, s/no, Gragoatá, 24210-340, Niterói, RJ, Brazil
Roberto M Anjos
Affiliation:
Instituto de Física, Universidade Federal Fluminense, Av. Gal Milton Tavares de Souza, s/no, Gragoatá, 24210-340, Niterói, RJ, Brazil
João M M Ketzer
Affiliation:
Instituto do Petróleo e dos Recursos Naturais (IPR), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Av. Ipiranga, 6681–96J, 90619-900, Porto Alegre, Brazil Department of Biology and Environmental Science, Linnaeus University, 391 81, Kalmar, Sweden
Anderson J Maraschin
Affiliation:
Instituto do Petróleo e dos Recursos Naturais (IPR), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Av. Ipiranga, 6681–96J, 90619-900, Porto Alegre, Brazil
Adolpho H Augustin
Affiliation:
Instituto do Petróleo e dos Recursos Naturais (IPR), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Av. Ipiranga, 6681–96J, 90619-900, Porto Alegre, Brazil
Vinicius N Moreira
Affiliation:
Instituto de Física, Universidade Federal Fluminense, Av. Gal Milton Tavares de Souza, s/no, Gragoatá, 24210-340, Niterói, RJ, Brazil
Victor H J M dos Santos
Affiliation:
Instituto do Petróleo e dos Recursos Naturais (IPR), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Av. Ipiranga, 6681–96J, 90619-900, Porto Alegre, Brazil
Marcelo C Muniz
Affiliation:
Instituto de Física, Universidade Federal Fluminense, Av. Gal Milton Tavares de Souza, s/no, Gragoatá, 24210-340, Niterói, RJ, Brazil
Renan P Cardoso
Affiliation:
Instituto de Física, Universidade Federal Fluminense, Av. Gal Milton Tavares de Souza, s/no, Gragoatá, 24210-340, Niterói, RJ, Brazil
Adriano R Viana
Affiliation:
Petrobras, EXP/GEOF/MNS, Av. República do Chile, 330, Centro, 20031-170, Rio de Janeiro, Brazil
Dennis J Miller
Affiliation:
Petrobras, Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello – CENPES, Av. Horácio de Macedo, 950, Ilha do Fundão, 21941-915, Rio de Janeiro, Brazil
*
*Corresponding author. Email: frederico.rodrigues@pucrs.br.
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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.

Keywords

bulk of organic mattermarine sedimentmass movementsradiocarbon analysis
Type
Research Article
Information
Radiocarbon , Volume 62 , Issue 1 , February 2020 , pp. 197 - 206
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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