砂岩中的洼地和剪切带变形:亚马逊盆地中部

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Carlos Alejandro Salazar , Roberto Cesar de Mendonça Barbosa , Isabela Apoema Gomes de Souza , Marta Edith Velásquez David , Andressa Resende Soares , Diego Wenderson Venâncio
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引用次数: 0

摘要

凹坑是一种与岩石露头(如花岗岩)的形成过程有关的形式,通常在潮湿的热带气候中,这些岩石特别容易受到水的物理和化学风化过程的影响。在亚马逊盆地的中心,瀑布、激流和坑洞发育的裂缝带形成于几条河流(Urubuí及其支流)的河床上,这些河流侵蚀了志留系纳姆蒙组的砂岩。为了阐明这些凹坑的成因,重点分析了石英屑岩到亚黑质砂岩中对侵蚀过程的敏感性、结构变化、矿物组成和应变变形的记录。在断裂带中,断裂的右旋简单剪切带系统及其共轭结构影响着排水网络。该研究表明,壶穴在空间上位于构造构造的交叉处,除了砂岩框架的溶蚀作用外,还允许大型壶穴的发展,如Mutum瀑布。它们是在纳姆蒙组的河谷中形成的形态动力学过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Potholes and shear zones deformation in sandstones: Central Amazon basin
A pothole is a form related to morphogenetic processes that occur in rock outcrops (such as granites), which are particularly susceptible to water physical and chemical weathering processes, generally in humid tropical climates. In the center of the Amazon basin, waterfalls, rapids streams, and knickzones with the development of potholes, are formed in the beds of several rivers (Urubuí and their tributaries) that erode sandstones from the Silurian Nhamundá Formation. To elucidate the origin of these potholes, there are highlights on analyzing the susceptibility to erosion processes, variations in texture, mineral composition, and strain deformation recorded in quartzarenite to subarkosic sandstones. Panholes are observed and associated with knickzones, where ruptile dextral simple shear zone systems and their conjugate structures influence the drainage network. This search shows that the potholes are spatially positioned at the intersections of tectonic structures which, in addition to the dissolution processes of the sandstone framework, allow the development of large-scale potholes, such as in the Mutum waterfall. They were formed by morphodynamic processes in river valleys carved out of the Nhamundá Formation.
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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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