Neotectonics as a structural control of the boundaries of the Pantanal Matogrossense Sub-Regions

Abstract: Characterized by fluvio-alluvial sedimentation processes, the heterogeneity in the Pantanal Basin allows its division in several sub-regions, which present natural characteristics of their own. It is possible to find in the literature different proposals to subdivide the Pantanal plain, which vary in total area and number of sub-regions. Each author uses specific criteria – mainly vegetation, soil and humidity – in his delimitation, but does not consider the tectonic aspects of the basin. In this sense, we intend to analyze three Pantanal delimitations from the literature and to relate them to the neotectonic context of the Pantanal plain by comparing the boundaries proposed in the delimitations to structural lineaments present in the basin. As a result, we observe that the comparison of the Pantanal boundaries with the lineaments shows a high compatibility between them, suggesting the influence of these structures in the development of the sub-regions.

摘要：潘塔纳尔盆地（Pantanal Basin）以河流冲积沉积作用为主要特征，其内部的异质性使其可被划分为多个各具独特自然属性的次级区域。现有研究文献中已提出多种潘塔纳尔平原的次级分区方案，不同方案在次级区域的总面积与数量上均存在差异。各研究在划定分区边界时均采用特定判定标准，主要涵盖植被、土壤与湿度条件，但均未考虑该盆地的构造特征。有鉴于此，本研究拟对文献中已有的三种潘塔纳尔盆地分区方案开展分析，通过对比各方案提出的分区边界与盆地内发育的构造线性形迹，探究分区方案与潘塔纳尔平原新构造背景之间的内在关联。研究结果显示，潘塔纳尔盆地分区边界与构造线性形迹的匹配度极高，表明这些构造结构对次级区域的发育存在显著影响。