巴西巴拉那隆德里纳新生代构造与地貌动态之间的相互作用

Ana Cecília Branco Sowinski, Eduardo Salamuni, Marcilene dos Santos, S. S. Calegari
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引用次数: 0

摘要

隆德里纳市位于巴西南部,坐落在巴拉那火成岩省(PIP)的玄武岩上,靠近瓜苏佩断层、圣杰罗尼莫-库里乌瓦线和圣塞巴斯蒂昂线等构造结构,在新生代有重新活化的历史。2015 年至 2018 年期间,该市发生了多次低震级地震,表明可能与这些结构有关。本研究将地貌定量分析与断层实地分析相结合,调查新生代构造与地貌动态之间的关系。研究结果显示了构造对地貌的控制迹象,两次区域性隆起/基底面下降影响了排水网络。重新激活的地段,尤其是东北和西北构造交汇处的地段,影响着动态变化,盆地之间的隆起率也随之变化,并在过渡强化机制下发生块体旋转。最近发生的地震与 N50-60E 断层(可能是瓜苏佩断层)的重新激活有关,这表明构造运动经常发生。古应力分析确定了三个变形脉冲,凸显了板块内地区地貌演变的复杂性。这些发现加深了人们对区域构造的了解,强调了理解南美洲板块等内部板块地区地貌演变的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interactions between Cenozoic tectonics and landscape dynamics in Londrina, Paraná, Brazil
The Londrina City, located in southern Brazil, is situated on the basalt of the Paraná Igneous Province (PIP), near tectonic structures such as the Guaxupé faults and the São Jerônimo-Curiúva and São Sebastião lineaments, with a history of reactivation in the Cenozoic. Between 2015 and 2018, low-magnitude earthquakes hit the municipality, suggesting a possible connection with these structures. This study investigates the relationship between Cenozoic tectonics and geomorphological dynamics, combining quantitative geomorphological analysis with field analysis of faults. The results reveal signs of tectonic control on the landscape, with two pulses of regional uplift/base level drop affecting the drainage network. Reactivated segments, especially at intersections of NE and NW structures, influence dynamics, with variations in uplift rates between basins and block rotation under a transtensive regime. Recent earthquakes are related to the reactivation of an N50-60E fault scarp, possibly the Guaxupé Fault, indicating recurrent tectonic movement. Paleostress analyses identify three deformation pulses, highlighting the complexity of landscape evolution in intraplate regions. These findings enhance understanding of regional tectonics, emphasizing the need to comprehend landscape evolution in interior plate areas, such as the South American Plate.
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