沉积盆地内部的后白垩世跨流板内构造:变形事件和水系的构造控制

IF 1.5 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Idjarrury Gomes Firmino , Edison Fortes , Eduardo Salamuni
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引用次数: 0

摘要

帕拉纳盆地的中央河道被帕拉纳河左岸的两条重要支流所沐浴:Ivaí和Piquiri河。该地区部分支流与基底继承的断裂带排列,在白垩纪期间及之后被重新激活,这是盆地内沉积的最后阶段。一些排水异常反过来表明,直到更新世,当排水网络的最后一次重新排列发生时,重新激活。然而,白垩纪后的盆地构造演化模型不允许精确地建立这些关系。为了填补这一空白,我们提出了一个帕拉纳盆地中部的构造演化模型。通过对区内4个采石场具有运动指示的断层类型的调查,得出构造构造分析结论。区内断层多为横流断层,具有高角度、低倾角的槽阶。这一分析表明,该地区受到白垩纪以来多达四次变形事件的影响。这4个事件均表现为亚水平的超强剪切和纯粹的张拉剪切,最近的一次定义于更新世,超强剪切指向N67W。这些事件对该地区部分河流的治理具有重要意义。E4(更新世)事件导致了N60-70E(瓜苏坡方向)和N70-90W方向断裂的右旋活化,以及N0-30W和N30-60W方向的左旋断裂的活化。与这些断层相关的是影响Goio-Erê河曲流带冲积层的地形,Piquiri河基岩的变形,与Formosa do Oeste (PR)称为“挤压”的排水异常的成核有关,curitiba - maring断裂带的失败堤岸的产生,以及paran河第四纪沉积物和Marília组砂岩(SP)的变形记录。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Transcurrent Post-Cretaceous intraplate tectonics in the interior of the Paraná Sedimentary Basin: deformation events and structural control of drainage network

Transcurrent Post-Cretaceous intraplate tectonics in the interior of the Paraná Sedimentary Basin: deformation events and structural control of drainage network
The central channel of the Paraná Basin is bathed by two important tributaries of the left bank of the Paraná River: the Ivaí and Piquiri rivers. Some tributaries of this region are aligned with fault zones inherited from the basement, suggestively reactivated during and after the Cretaceous, during which the last phase of sedimentation within the basin occurred. Some drainage anomalies, in turn, are indicative of reactivation until the Pleistocene, when the last rearrangement of the drainage network took place. However, models of post-Cretaceous tectonic evolution in the basin do not allow these relationships to be precisely established. To fill this gap, we propose a model of tectonic evolution of the central portion of the Paraná Basin. The structural and tectonic analysis were derived from the survey of the types of faults that presented kinematic indicators in four quarries within the region, where most of the faults are transcurrent and have high angle and low dip grooves and steps. This analysis demonstrated that the region was affected by up to four deforming events from the Cretaceous. The four events present sub-horizontal SHmax and pure to transtensional shear, the most recent being defined from the Pleistocene, with SHmax oriented in N67W. These events had important significance in the control of some rivers in the region. The E4 (Pleistocene) event was responsible for the dextral reactivation of N60-70E (Guaxupé direction) and N70-90W faults, and the sinistral faults with N0-30W and N30-60W directions. Associated with these faults are lineaments affecting the alluvium in the meandering belt of the Goio-Erê River, deformations in the bedrock in the Piquiri River, associated with the nucleation of the drainage anomaly called “the squeeze” in Formosa do Oeste (PR), the generation of failed dikes in the Curitiba-Maringá Fault Zone, in addition to records of deformations in Quaternary sediments of the Paraná River and in sandstones of the Marília Formation (SP).
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来源期刊
Journal of South American Earth Sciences
Journal of South American Earth Sciences 地学-地球科学综合
CiteScore
3.70
自引率
22.20%
发文量
364
审稿时长
6-12 weeks
期刊介绍: Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.
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