Evolução tectônica do segmento extremo leste da Margem Equatorial brasileira: contribuição do mapeamento estrutural (onshore) e da modelagem física
type: CreativeWork
description: The discovery in recent decades of hydrocarbon provinces associated with the Equatorial Transform Margin (ETM), has generated a growing interest in better understanding the evolution of this margin, being considered a new exploratory frontier. In the Brazilian portion, this margin comprises intracontinental rifts and passive margins. In the present work, we investigated the evolution of the ETM, from the application of the structural physical modeling tool and a multiscale analysis of the brittle deformation record in the crystalline basement of the Potiguar and Ceará basins, the easternmost portion of the Brazilian Equatorial Margin (BEM). The modeling data show that during the ETM rifting process occurred a dominantly oblique kinematic regime. This margin comprised during its initial stage, on a plate scale, an important oblique transfer zone (α = 20º) developed between the South and Central Atlantic. In the mature stage, this zone evolved into diachronic oblique rifts, whose margins are composed of NW-SE oblique (dextral-normal) faults and E-W to WNW-ESE transcurrent faults, that together define a zigzag geometry. Two distinct tectonic domains occur in the ETM: (i) the extremity regions characterized by oblique deformation with intense rotation and tilting of the substrate; and (ii) the central region dominated by transcurrent (and oblique) deformation, with the presence of oblique and pull-apart basins, in addition to marginal plateaus. In the easternmost segment of the BEM has shown evidence of the superimposed deformational events related to pre- and syn-structuring of this margin. The oldest event, D1 (Late-Brasiliano) is expressed by the NE-SW dextral shear fractures staggered and extensional fractures fill and unfilled with quartz and chalcedony (NE-SW to E-W). This event is related to an intraplate NESW transpression associated with the progressive exhumation of the Brazilian-Pan African orogenic chain. The D2 event (Neo-Jurassic to Aptian) is characterize…
abstract: The discovery in recent decades of hydrocarbon provinces associated with the Equatorial Transform Margin (ETM), has generated a growing interest in better understanding the evolution of this margin, being considered a new exploratory frontier. In the Brazilian portion, this margin comprises intracontinental rifts and passive margins. In the present work, we investigated the evolution of the ETM, from the application of the structural physical modeling tool and a multiscale analysis of the brittle deformation record in the crystalline basement of the Potiguar and Ceará basins, the easternmost portion of the Brazilian Equatorial Margin (BEM). The modeling data show that during the ETM rifting process occurred a dominantly oblique kinematic regime. This margin comprised during its initial stage, on a plate scale, an important oblique transfer zone (α = 20º) developed between the South and Central Atlantic. In the mature stage, this zone evolved into diachronic oblique rifts, whose margins are composed of NW-SE oblique (dextral-normal) faults and E-W to WNW-ESE transcurrent faults, that together define a zigzag geometry. Two distinct tectonic domains occur in the ETM: (i) the extremity regions characterized by oblique deformation with intense rotation and tilting of the substrate; and (ii) the central region dominated by transcurrent (and oblique) deformation, with the presence of oblique and pull-apart basins, in addition to marginal plateaus. In the easternmost segment of the BEM has shown evidence of the superimposed deformational events related to pre- and syn-structuring of this margin. The oldest event, D1 (Late-Brasiliano) is expressed by the NE-SW dextral shear fractures staggered and extensional fractures fill and unfilled with quartz and chalcedony (NE-SW to E-W). This event is related to an intraplate NESW transpression associated with the progressive exhumation of the Brazilian-Pan African orogenic chain. The D2 event (Neo-Jurassic to Aptian) is characterize…
author: Rodrigues, Ricardo de Souza
language: pt_BR
keywords: Deformação frágil, Margens transformantes, Margem Equatorial, Modelagem física estrutural
date published: 2022-12-14
date modified: 2026-07-24T01:20:46Z
provider: Brazil UFRN
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universidade Federal do Rio Grande do Norte