Spatial sedimentary distribution, seasonality and the characteristics of organic matter on Fernando de Noronha insular shelf

Q2 Earth and Planetary Sciences

Brazilian Journal of Oceanography Pub Date : 2018-03-01 DOI:10.1590/S1679-87592018146206601

R. Barcellos, L. E. Oliveira, M. Flores-Montes

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引用次数: 2

Abstract

The present study was conducted in the Fernando de Noronha archipelago (4°S/32°W). The objective is the evaluation of the spatial distribution and seasonal variations in the sediments and sedimentary organic matter in the northern insular shelf of Fernando de Noronha ("Mar de Dentro"). Nineteen surface sediment samples were collected between December 2013, July 2014 and November 2014. The studied methods included analysis of the grain size, coarse fraction, morphoscopy, total organic matter content, calcium carbonate, organic carbon, total nitrogen, sedimentary phosphorus (organic, inorganic and total), elemental ratios (C/N, C/P) and stable isotopic ratios (δ13C-δ15N). The results allowed to infer that there is no seasonal variation in sediment distribution. Whereas, the shelf sediments present a calcareous sandy sedimentary cover (CaCO3≈ 88.3%), predominantly of well-sorted fine sands, with low organic matter content (TOM ;3.0%; TN>;0.4%) of mixed origin (δ13C= -24.5 to -23.0%PDB), which were related to anthropogenic impacts and the biotic and abiotic local processes.

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Fernando de Noronha岛架的空间沉积分布、季节性和有机质特征

本研究在Fernando de Noronha群岛(4°S/32°W)进行。目的是评价Fernando de Noronha(“Mar de Dentro”)北部岛架沉积物和沉积有机质的空间分布和季节变化。2013年12月、2014年7月和2014年11月采集了19份地表沉积物样本。研究方法包括粒度、粗组分、形貌、总有机质含量、碳酸钙、有机碳、总氮、沉积磷(有机、无机和全磷)、元素比(C/N、C/P)和稳定同位素比(δ13C-δ15N)。结果表明，沉积物分布没有季节变化。陆架沉积物呈钙质砂质沉积盖层(CaCO3≈88.3%)，以分选良好的细砂为主，有机质含量较低(TOM;3.0%;δ13C= -24.5 ~ -23.0%PDB)，与人为影响、生物和非生物局部过程有关。

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来源期刊

Brazilian Journal of Oceanography 地学-海洋学

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Brazilian Journal of Oceanography covers the entire spectrum of disciplines within the science of oceanography, publishing articles dealing with the biological oceanography, physical oceanography, marine chemistry, sedimentology and geology, from coastal and estuarine waters out to the open sea. Emphasis is placed on inter-disciplinary process-oriented contributions. BJO also publishes issues dedicated to results of scientific meetings and of large inter-disciplinary studies or topical issues on specific subjects. The audience is composed by physical, chemical and biological oceanographers, marine sedimentologists, geologists and geochemists, marine biologists and ecologists. Papers sent to BJO must present results from original research and be written in english.