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Carbonate granulates from the continental shelf of the State of Paraíba, NE Brazil

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Abstract

The Brazilian continental shelf, particularly its northeast sector, is a conducive environment for the deposition of biogenic carbonate granules. In Brazil, the use of marine calcium carbonate (CaCO3) derived from biogenic sediments is still in its early stages but its economic potential has become significant. Regarding the State of Paraíba, located in northeastern Brazil, it has been acknowledged that the survey and study of the sediments deposited on its continental shelf is not only of economic importance, but will lead to the understanding of their distribution and of the influence of geological, hydrodynamic, and biological processes in their deposition. For this purpose, 1096 sediment samples, collected during the GranMar project (Marine Granules of Brazil), were analyzed in this study. Sampling was conducted using a Van Veen-type grab sampler, and sampling depth was determined using an EDO 185 Oceanographic 12 kHz echosounder. The grain-size analyzes were conducted by sieving and CaCO3 content determinations were performed using an adapted Bernard calcimeter. The bathymetric map revealed morphological evidence of distinct seafloor characteristics between the northern and southern regions of the shelf. The shelf is defined as carbonate-rich, with CaCO3 contents above 75 wt.%, consisting mainly of bioclasts. The most abundant particle-size fractions range from gravel to sand. Three sedimentary facies were mapped along the continental shelf of the State of Paraíba: Bioclastic Sand with Granules and Gravel; Bioclastic Gravel and Bioclastic Sand. The facies characterization of continental shelf sediments, is important not only for a better understanding the shelf environment, reflecting past and current geological and hydrodynamic processes, but also for conservation, management, and assessment of environmental impacts, as preconized by the United Nations Sustainable Development Goal 14–Life Below Water.

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Data availability

The data used in this manuscript are the property of the Marine and Applied Geology Laboratory at the Federal University of Ceará. Author Narelle Maia de Almeida is responsible for the coordination and management of the laboratory.

Code availability

Not applicable.

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Acknowledgements

We would like to express our gratitude to the Geology Postgraduate Programs at the Federal University of Pernambuco and the Federal University of Ceará. We also extend our thanks to the Brazilian Geological Service (SBG-CPRM) for the partnership during the Gramar project.

Funding

We thank the Brazilian Geological Service (SGB-CPRM) for the GranMar Project (Granulados Marinhos) and the Brazilian Navy. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001.

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Authors and Affiliations

  1. Postgraduate Program in Geology, Marine and Applied Geology Laboratory. Geology Department, Federal University of Ceará, Fortaleza, Ceará, Brazil

    Guilherme Augusto Mendonça Maia, George Satander Sá Freire & Narelle Maia de Almeida

  2. Marine Geology and Geophysics Laboratory. Geology Department, Federal University of Pernambuco, Recife, Pernambuco, Brazil

    Valdir do Amaral Vaz Manso

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  1. Guilherme Augusto Mendonça Maia
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  2. Valdir do Amaral Vaz Manso
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  3. George Satander Sá Freire
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Contributions

All authors contributed to the development of this study. Author Guilherme Maia conducted data analysis and drafted the initial version of the manuscript and figures. Authors Valdir do Amaral, George Satander Freire, and Narelle Maia de Almeida participated in sample collection and physical and chemical analyses. The study's conceptualization and data provision were carried out by authors Narelle Maia de Almeida, George Satander Freire, and Valdir do Amaral. All authors reviewed earlier versions, contributing to the final manuscript.

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Correspondence to Guilherme Augusto Mendonça Maia.

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Maia, G.A.M., Manso, V.d., Freire, G.S.S. et al. Carbonate granulates from the continental shelf of the State of Paraíba, NE Brazil. Geo-Mar Lett 44, 9 (2024). https://doi.org/10.1007/s00367-024-00771-8

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