Structural framework and Mesozoic–Cenozoic evolution of Ponta Grossa Arch, Paraná Basin, southern Brazil
- 作者：Michael Strugale ; Sidnei Pires Rostirolla ; Fern ; o Mancini ; Carlos Vieira Portela Filho ; Francisco José ; Fonseca Ferreira ; Rafael Corrê ; a de Freitas
- 关键词：Paraná ; intracratonic basin ; Ponta Grossa Arch ; Mesozoic ; Structural analysis ; Aeromagnetometry ; Lineaments
Palavras-chave ; Bacia Intracratô ; nica do Paraná ; Arco de Ponta Grossa ; Mesozó ; ico ; aná ; lise estrutural ; ae - 刊名：Journal of South American Earth Sciences
- 出版年：2007
- 期刊代码：50_08959811
- 类别：ear
- 出版时间：September-October 2007
- 卷：24
- 期：2-4
- 页码：203-227
- 文件大小：8240 K
摘要
The integration of structural analyses of outcrops, aerial photographs, satellite images, aeromagnetometric data, and digital terrain models can establish the structural framework and paleostress trends related to the evolution of Ponta Grossa Arch, one of the most important structures of the Paraná Basin in southern Brazil. In the study area, the central-northern region of Paraná State, Brazil, the arch crosses outcropping areas of the Pirambóia, Botucatu, and Serra Geral Formations (São Bento Group, Mesozoic). The Pirambóia and Botucatu Formations are composed of quartz sandstones and subordinated siltstones. The Serra Geral Formation comprises tholeiitic basalt lava flows and associated intrusive rocks. Descriptive and kinematic structural analyses reveal the imprint of two brittle deformation phases: D1, controlled by the activation of an extensional system of regional faults that represent a progressive deformation that generated discontinuous brittle structures and dike swarm emplacement along a NW–SE trend, and D2, which was controlled by a strike-slip (transtensional) deformation system, probably of Late Cretaceous–Tertiary age, responsible for important fault reactivation along dykes and deformation bands in sandstones.