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Sedimentary Organic Matter Characterization on a Tropical Continental Shelf in Northeastern Brazil

International Journal of Geosciences 2020年第6期11卷 393-419页

作者： Roberto Lima Barcellos Maria Cristina da Silva Sales de Melo Alcides Nobrega Sial Valdir do Amaral Vaz Manso Labogeo/GSGMar Oceanography Department Federal University of Pernambuco Recife Brazil LGGM Geology Department Federal University of Pernambuco Recife Brazil NEG-Labise Geology Department Federal University of Pernambuco Recife Brazil

In continental shelf areas works where the focus is Geochemistry are widely relevant, due to the vast complexity and uses of these relief features (social, environmental and economic). On the Brazilian Northeast tropical shelves, with emphasis on the Pernambuco Continental Shelf (PCS), the published studies are limited and have aimed at portions closer to the coastline. The objective of the present work is the description of the characteristics and origin of sedimentary organic matter (SOM) in the inner and middle Pernambuco shelf, defining and classifying the local geochemical sedimentary facies. The sampling stations (136) were collected in the study area, and the grain-size, contents of total organic matter (TOM), calcium carbonate (CaCO3) were analyzed. The samples were processed in an elemental analyzer coupled with a mass spectrometer after the elimination of calcium carbonate. The obtained data were the grain-size, TOM, CaCO3, elemental (C, N) and the stable isotopic ratios of δ13C e δ15N of SOM. Based on the measured values of carbon and nitrogen, the C/N ratio, associated to δ13C e δ15N, is observed that in the PCS predominates an organic matter of marine origin along its entire length: C < 1%, N < 1%, C/N < 5, <

关键词： Biogenic Sediments Total Nitrogen δ13C Stable Isotopic Ratio geochemical facies Pernambuco

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