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SSRN 2024年

作者： Lima, Francisco Gabriel Ferreira de de Sá, Emanuel Ferraz Jardim Medeiros, Walter Eugênio de Post-Graduation Program on Geodynamics and Geophysics Federal University of Rio Grande do Norte Natal Brazil Campus Universitário Lagoa Nova Caixa Postal 1.596 RN NatalCEP 59078-970 Brazil Department of Geophysics Federal University of Rio Grande do Norte Natal Brazil Department of Geology Federal University of Rio Grande do Norte Natal Brazil INCT-GP/CNPq CAPES-National Institute of Science and Technology in Petroleum Geophysics Brazil

The Brazilian Equatorial Margin (BEM) encompasses a WNW to NW-trending segment along which a complex set of sedimentary basins were developed from the Neobarremian to the Albian. Recent discoveries of hydrocarbon reserves in the continental margins of Ghana, in Africa, and Guyanas/Suriname, in South America, have heightened interest in studying the Equatorial Atlantic margins. In this context, it is crucial to understand better the mechanisms that led to the formation of these basins, whose exploratory potential is still open. Most studies on the BEM either focus on small areas without comparing results to their African counterparts or involve regional reconstructions that overlook hyperextended crustal sections, thus hindering a more accurate fit. This work aims to define the deep crustal architecture of the BEM and delineate the transition from continental to strictly oceanic crust based on the merging of gravimetric, magnetic, and multichannel 2D seismic reflection data from various sources, types, and resolutions. Our findings have allowed us to categorize the BEM into four domains: proximal (PD), necking zone (NZ), ocean-continent transition (OCT), and oceanic crust (OC). These domains feature a predominance of Aptian to Albian NW-SE normal and oblique-slip faults, as well as NE-SW folds and thrusts, all of which are associated with E-W strike-slip or oblique-slip faults. The nature of the ocean-continent transition zone can vary from gradual to abrupt, depending on its location and the dominant structural style in each margin segment. The oceanward limit of the OCT domain is marked by a continent-ocean boundary (COB) that runs orthogonal to the present-day oceanic fracture zones, unlike what has been reported in other studies. Our defined boundaries ensured a good fit between the continental crusts of the BEM and the African Equatorial Margin (AEM) during the Cenomanian period. © 2024, The Authors. All rights reserved.

关键词： Strike-slip faults

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Hydrothermal Silicification Along Rift Border Faults in the Rio Do Peixe Basin, Brazil

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SSRN 2024年

作者： Maciel, Ingrid Barreto Balsamo, Fabrizio Bezerra, Francisco H.R. Nogueira, Francisco Cézar Costa Berio, Luigi Riccardo Brod, José Affonso de Souza, Zorano Sérgio Matos-Pimentel, Hannah Larissa Siqueira Carvalho, Bruno R.B.M. Souza, Jorge André Braz Post-Graduation Program on Geodynamics and Geophysics Universidade Federal do Rio Grande do Norte RN Natal59078-970 Brazil Department of Chemistry Life Sciences and Environmental Sustainability University of Parma ParmaI-43124 Italy Department of Petroleum Engineering Federal University of Campina Grande PB Campina Grande58100-000 Brazil Federal University of Goiás GO Goiânia74690-970 Brazil Petrobras Research Center—CENPES RJ Rio de Janeiro21941-915 Brazil

This study investigates hydrothermal silicification along rift border faults in the Cretaceous Rio do Peixe Basin, Brazil, using field geology, petrography, mineralogy, microtexture, and fluid inclusion microthermometry. We distinguish three main diagenetic domains: (1) a non-silicified damage zone, (2) a silicified damage zone composed of deformation bands and centimeter-scale quartz veins in the hanging wall and footwall, respectively, and (3) a silicified fault core with meter-scale wide quartz veins and mosaic breccia textures. We recognize three main events of deformation and silicification in the fault zone. The first silicification event occurs after the widespread development of deformation bands in the hanging wall damage zone that may reach 200 m in width. During subsequent deformation events, multiple fracturing episodes were accompanied with precipitation of the second quartz generation in hydraulic mosaic breccias and the third quartz cement in vein stockworks. Shallow burial conditions of faulting ( © 2024, The Authors. All rights reserved.

关键词： Quartz

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Erratum to “Geophysically-BASED structural framework and tectonic evolution of the Brazilian equatorial margin” [Tectonophysics 896 (2025) /230604]

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Tectonophysics 2025年 897卷

作者： Francisco Gabriel Ferreira de Lima Walter Eugênio de Medeiros Emanuel Ferraz Jardim de Sá Post-Graduation Program on Geodynamics and Geophysics Federal University of Rio Grande do Norte Natal Brazil Department of Geophysics Federal University of Rio Grande do Norte Natal Brazil INCT-GP/CNPq/CAPES-National Institute of Science and Technology in Petroleum Geophysics Portugal Department of Geology Federal University of Rio Grande do Norte Natal Brazil

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The Fracture-Controlled Carbonate Brejões Karst System Mapped with Uav, Lidar, and Electroresistivity in the Irecê Basin - Brazil

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SSRN 2022年

作者： Furtado, Carla P.Q. Borges, Sergio Vieira Freire Borges Lima-Filho, Francisco P. Bezerra, Francisco H.R. de Castro, David L. Maia, Rubson P. Teixeira, Washington L.E. de Souza, Anderson M. Auler, Augusto S. Post-Graduation Program on Geodynamics and Geophysics Federal University of Rio Grande do Norte Natal Brazil Federal Institute of Rio Grande do Norte Natal Brazil Federal Institute of Paraíba Picuí Brazil Department of Geology Federal University of Rio Grande do Norte Natal Brazil Department of Geography Federal University of Ceará Fortaleza Brazil Instituto do Carste Carste Ciência e Meio Ambiente Belo Horizonte Brazil

Understanding how fractures influence fluid flow in the carbonate rocks is essential to understand karst evolution, oil reservoir, and aquifer exploitation. The present study investigates karst geometry, volumes, and fracture-related genesis at the surface and subsurface in the Irecê Basin, a Neoproterozoic epicontinental cratonic basin in the São Francisco Craton, Brazil. We used an unmanned aerial vehicle (UAV) to map fractures in three outcrops and valley geometry, Light Detection and Range imaging (LiDAR) to map 3,500 m of cave conduits, and Electrical Resistivity Tomography (ERT) to identify karst zones up to 90 to 110 m deep. Our results indicate that the Brejões karst system comprises dissolution and collapse features such as a cave, dolines, pavements, and a karst valley. These features concentrate along an open anticlinal hinge. The quantitative analysis of subseismic fractures ( © 2022, The Authors. All rights reserved.

关键词： Optical radar

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