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Organic matter is an important source of information on the transport and consolidation processes of sediments. In this study, the isotopes of carbon and nitrogen (δ13C and δ15N), total organic carbon (TOC), total nitrogen, carbon/nitrogen (C/N) ratio, and 13C-NMR were utilized to understand the origin and behavior of organic material in the Abrolhos region. It were analyzed nine sediment cores taken from a mangrove, a channel between the mainland and the coral reefs. The average value of the C/N ratio in the mangrove was 18, which characterizes purely terrigenous areas. For the reefs, the average value of the C/N ratio was 8,which is characteristic of marine and coastal regions. For the sediment cores taken from the channel, the average value of the C/N ratio was 10, a typical value of areas under the influence of mangroves. The mean values of δ13C were -26.9‰ for the mangrove, -20.7‰ for the channel region, and -18.2‰ for the reefs. This variation is associated with the main source of organic matter, which in the mangrove is derived from vascular plants (mainly C3 metabolism) and for the reefs is derived from phytoplankton. The 13C-NMR results corroborate the isotopic and elemental analyses. The analyses of these cores indicate that the anthropogenic influence on the coast did not significantly alter the composition of the material that has been deposited in about the last 80 years in the region of study.A matéria orgânica é uma fonte de informação importante nos processos\udde transporte e consolidação de sedimentos. Neste estudo, foram utilizados\udisótopos de carbono e de nitrogênio (δ13C e δ15N), carbono orgânico total\ud(TOC), nitrogênio total, razão carbono/nitrogênio (C/N) e 13C-NMR para\udentender a origem e o comportamento do material orgânico na região de\udAbrolhos. Foram analisados nove testemunhos de sedimentos coletados em\udum manguezal, em um canal e em recifes de corais. O valor médio da razão\udC/N no manguezal foi de 18, o que caracteriza áreas puramente terrígenas.\udNos recifes, esse valor foi de 8, característico de regiões marinhas e costeiras,\ude, nos testemunhos de sedimentos coletados no canal, foi de 10, um valor\udtípico de áreas sob a influência de manguezais. O valor médio de δ13C foi de\ud-26,9‰ para o manguezal, -20,7‰ para a região do canal e -18,2‰ para os\udrecifes. Essa variação é associada com a principal fonte de matéria orgânicaa qual, no manguezal, é derivada de plantas vasculares (principalmente de\udmetabolismo C3) e, nos recifes, é derivada de fitoplâncton. Os resultados de\ud13C-NMR corroboram as análises isotópicas e elementais. As análises dos\udtestemunhos indicam que a influência antropogênica da região costeira não\udaltera significantemente a composição do material que tem sido depositado\udnos últimos 80 anos na região estudad

geochimica brasiliensis

Carbon and nitrogen stable isotope compositions of organic matter in marine sediment cores from the Abrolhos region: indicators of sources and preservation