Characterization of the organic matter in pockmark areas of the Southwestern Atlantic upper slope

Lourenço, Rafael André; Kunrath, Nathalia Araujo; Nagaoka, Doris; Magalhães, Caio Augusto; Pereira, Antonio Derley de Sousa; Sotão Neto, Basílio Magno Tavares; Timoszczuk, Cristian Taboada; Santos, Felipe Rodrigues dos; Pedrão, Guilherme Augusto; Araujo, Lígia Dias de; Nascimento, Lorena Sampaio; Carvalho, Nayara Ferreira; Silva, Josilene da; Taniguchi, Satie; Mahiques, Michel Michaelovitch de; Bícego, Márcia Caruso; Sumida, Paulo Yukio Gomes

doi:10.1590/2675-2824070.22022ral

Brazil

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Original Article • Ocean Coast. Res. 70 (suppl 2) • 2022 • https://doi.org/10.1590/2675-2824070.22022ral linkcopy

Characterization of the organic matter in pockmark areas of the Southwestern Atlantic upper slope

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Pockmarks are circular or elliptical structures formed at the seabed by the expulsion of gas from the subsurface. They are widely distributed along the continental margin off southeastern Brazil and can be over a kilometer wide and 100 meters deep. However, studies concerning the organic characteristics of these pockmark areas are scarce. This study sought to evaluate the organic composition of the sedimentary matter in pockmark areas located in the continental slope region of the southern Brazilian coast. Hydrocarbons, sterols, long-chain alcohols, stable isotopes of C and N, total organic carbon, and total nitrogen were assessed to provide an organic molecular characterization of the pockmarks located in the Southwestern Atlantic Ocean. These compounds did not reflect the organic characteristics of the scape of fluids that generate pockmark structures.

Descriptors:
Sediment; Hydrocarbons; Stable isotopes; Sterols; Alcohols

Sampling Point	Latitude (S)	Longitude (W)	Depth (m)	Aliphatic Hydrocarbons	Polycyclic Aromatic Hydrocarbons	Sterols	n-Alcohols	TOC, TN,CaCO₃; and δ¹³C δ¹⁵N
253	26°14.72’	045°40.97’	731	every 2 cm	-	every 2 cm	every 2 cm	every 2 cm
254	26°15.72’	045°42.97’	747	every 2 cm	-	every 2 cm	every 2 cm	every 2 cm
255	26°29.68’	045°58.15’	652	every 2 cm	-	every 2 cm	-	every 2 cm
257	26°32.08’	046°04.82’	543	every 2 cm	-	every 2 cm	every 2 cm	every 2 cm
265	24°40.3T	044°04.89’	818	every 2 cm	every 2 cm	-	every 2 cm	every 2 cm
267	24°33.18'	043°55.43’	805	every 2 cm	every 2 cm	-	every 2 cm	every 2 cm
586	25°02.97’	044°35.95’	1009	0-2 cm only	-	-	-	0-2 cm only
587	25°00.06’	044°29.36’	1070	0-2 cm only	-	-	-	0-2 cm only
588	24°56.19’	044°28.72’	663	0-2 cm only	-	-	-	0-2 cm only
589	24°55.51’	044°26.28’	780	0-2 cm only	-	-	-	0-2 cm only
591	24°54.49’	044°34.53’	547	0-2 cm only	-	-	-	0-2 cm only
592	24°54.43’	044°34.51’	535	0-2 cm only	-	-	-	0-2 cm only
593	24°53.32’	044°29.81’	563	0-2 cm only	-	-	-	0-2 cm only
689	26°15.74’	045°42.87’	592	0-2 cm only	0-2 cm only	0-2 cm only	0-2 cm only	0-2 cm only
690	26°11.56’	045°38.73’	592	2 cm interval	2 cm interval	2 cm interval	2 cm interval	2 cm interval
691	26°53.22’	046°24.73’	592	2 cm interval	2 cm interval	2 cm interval	2 cm interval	2 cm interval

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Instituto Oceanográfico da Universidade de São Paulo Praça do Oceanográfico 191, CEP: 05508-120, São Paulo, SP - Brasil, Tel.: (11) 3091-6501 - São Paulo - SP - Brazil
E-mail: diretoria.io@usp.br

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