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首页> 外文期刊>Brazilian Journal of Geology >The Quaternary alluvial systems tract of the Pantanal Basin, Brazil
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The Quaternary alluvial systems tract of the Pantanal Basin, Brazil

机译：巴西潘塔纳尔盆地第四纪冲积系统

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ABSTRACT The Pantanal Basin is an active sedimentary basin in central-west Brazil that consists of a complex alluvial systems tract characterized by the interaction between different river systems developed in one of the largest wetlands in the world. The Paraguay River is the trunk river system that drains the water and part of the sediment load received from areas outside of the basin. Depositional styles vary considerably along the river profiles throughout the basin, with the development of entrenched meandering belts, anastomosing reaches, and floodplain ponds. Paleodrainage patterns are preserved on the surface of abandoned lobes of fluvial fans, which also exhibit many degradational channels. Here, we propose a novel classification scheme according to which the geomorphology, hydrological regime and sedimentary dynamics of these fluvial systems are determined by the geology and geomorphology of the source areas. In this way, the following systems are recognized and described: (I) the Paraguay trunk-river plains; (II) fluvial fans sourced by the tablelands catchment area; (III) fluvial fans sourced by lowlands; and (IV) fluvial interfans. We highlight the importance of considering the influences of source areas when interpreting contrasting styles of fluvial architectures in the rock record.
机译：摘要Pantanal盆地是巴西中西部一个活跃的沉积盆地，由复杂的冲积系统组成，其特征是世界上最大的湿地之一开发的不同河流系统之间的相互作用。巴拉圭河是主干河系统，用于排水和从流域以外地区接收的部分沉积物负荷。随着盘根蜿蜒的带，吻合河段和洪泛区池塘的发展，整个盆地的河流剖面沉积样式差异很大。排水沟的形态保留在河扇的废弃叶片表面上，这些叶片也表现出许多降解通道。在此，我们提出了一种新颖的分类方案，根据这些分类方案，通过源区的地质和地貌确定这些河流系统的地貌，水文状况和沉积动力学。这样，就可以识别和描述以下系统：（I）巴拉圭主干河平原; （二）平原集水区引来的河扇; （III）来自低地的河流爱好者; （IV）河流同伴。我们强调在解释岩石记录中河流建筑的对比风格时，考虑源头地区影响的重要性。

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