Tectonic and lithologic controls on the landscape adjustment along the eastern terrain of the Mae Tha fault, northern Thailand

IF 1.3 4区 地球科学 Q2 GEOLOGY
Pichawut Manopkawee, N. Mankhemthong, Chanin Pattarakamolsen
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Abstract

Understanding the interaction between tectonics, climatically-driven surficial processes, and bedrock erodibilityprovides insight into how the landscape develops over space and time. Although numerous active faults, lithologicand climatic variability control the landscape across Northern Thailand, the influence of these factors on thespatial adjustment of a dynamic landscape is largely unknown. In the study, we focus on lower-order channelsdeveloped across the eastern terrain of the Mae Tha fault, in which spatial variability in rock mass quality and faultcharacteristics strongly control the landscape. We combine topographic data analysis from channel profiles andgeologic field observations to determine variations in bedrock watershed characteristics and any linear structuresacross the site. Our results reveal that channels in the northern and central zones of the terrain are relatively steeperbecause a west-dipping fault controls them with less fracture density of granite. Channels in the south, however,are less steep as an oblique-slip fault governs their profiles with a higher fracture density of bedrock. Moreover,channels flowing across different lithologic bedrocks exhibit steeper channel profiles than channels developed inuniform lithology. Our study highlights the use of topographic adjustment as one of the efficient tools to describethe dynamics of active deformation on the landscape over space and time. According to the mutual analysis, ourfinding suggests that lithologic resistance and spatial differences in fault lineaments ultimately control charactersof channel profiles and overall landscape topography.
泰国北部梅塔断层东部地形景观调整的构造和岩性控制
了解构造、气候驱动的地表过程和基岩可蚀性之间的相互作用,可以深入了解景观如何在空间和时间上发展。尽管许多活动断层、岩性和气候变化控制着泰国北部的景观,但这些因素对动态景观的空间调整的影响在很大程度上是未知的。在这项研究中,我们重点关注Mae Tha断层东部地形上发育的低阶通道,其中岩体质量和断层特征的空间变异性强烈控制着景观。我们将河道剖面的地形数据分析和地质现场观测相结合,以确定基岩流域特征的变化以及现场附近的任何线性结构。我们的研究结果表明,地形北部和中部地带的通道相对陡峭,因为向西倾斜的断层控制着它们,花岗岩的断裂密度较小。然而,南部的河道不那么陡峭,因为倾斜滑动断层的剖面具有更高的基岩断裂密度。此外,流经不同岩性基岩的河道比发育不均匀岩性的河道具有更陡的河道剖面。我们的研究强调,地形平差是描述景观在空间和时间上主动变形动力学的有效工具之一。根据相互分析,我们的发现表明,岩性阻力和断层线的空间差异最终控制了河道剖面和整体景观地形的特征。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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