A Quantitative Provenance Analysis (QPA) Approach to Quantify Controls on Sediment Generation and Sediment Flux in the Upper Reaches of the Magdalena River (Colombia): 2. Lithological Control on Contribution to Silt- to Clay-Sized Fractions

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Geophysical Research: Earth Surface Pub Date : 2024-05-02 DOI:10.1029/2023JF007379
S. Liedel, L. Caracciolo, A. Beltrán-Triviño, J. C. Restrepo, J. D. Restrepo Ángel, M. Szczerba
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Abstract

The composition of 27 fluvial silt and clay sediments was used in this study to identify and quantify the processes in the upper valley of the Magdalena river in South Colombia. The combination of seismic activity, intense precipitation, and landsliding resulted in limited chemical weathering and a very efficient transfer of weathered products to the transfer zone of both tributary rivers and the main trunk. Inputs from plutonic, high-grade metamorphic, volcanic, and low- to medium-grade metamorphic lithologies vary in coarse silt-sized versus fine silt- and clay-sized sediments, reflecting inherited textural parameters and mineralogy. Plutonic and high-grade metamorphic rocks mostly produce sand-sized sediments, up to two times more than coase silt and up to 10 times more than fine silt to clay. The prevalence of siltstone in the area enhances the contribution of sedimentary rocks to fine silt and clay (up to 50% higher than to sand). Volcanic rocks mainly produce coarse silt (up to 2.5 times more than sand). Low-grade metamorphic detritus is enriched in silt and clay (up to 5–7 times). These findings highlight the critical role of lithology in regulating sediment generation. The study's approach can establish or modify factors modeling lithological control on suspended sediment flux, such as in the BQART equation.

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采用定量原产地分析 (QPA) 方法量化马格达莱纳河上游(哥伦比亚)沉积物生成和沉积通量的控制因素:2.岩性对淤泥至粘土大小组分贡献的控制
这项研究利用 27 种河道淤泥和粘土沉积物的成分来确定和量化南哥伦比亚马格达莱纳河上游河谷的沉积过程。地震活动、强降水和山体滑坡的综合作用导致了有限的化学风化作用,并使风化产物非常有效地转移到支流和主干河的转移区。在粗粉砂大小与细粉砂和粘土大小的沉积物中,来自板岩、高品位变质岩、火山岩和中低品位变质岩岩性的输入不同,反映了继承的纹理参数和矿物学。深成岩和高品位变质岩大多产生砂粒大小的沉积物,比共粉砂岩多 2 倍,比细粉砂岩至粘土多 10 倍。该地区盛产粉砂岩,因此沉积岩对细粉砂和粘土的贡献更大(比砂高出 50%)。火山岩主要产生粗粉砂(是砂的 2.5 倍)。低品位变质碎屑岩富含粉砂和粘土(高达 5-7 倍)。这些发现凸显了岩性在调节沉积物生成方面的关键作用。该研究方法可以建立或修改悬浮泥沙通量的岩性控制建模因子,如 BQART 方程中的因子。
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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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