Grain-size variability of point-bar deposits from a fine-grained dryland river terminus, Southern Altiplano, Bolivia

Li, Jiaguang; Vandenberghe, Jef; Mountney, Nigel P.; Lüthi, Stefan M.

doi:10.1016/j.sedgeo.2020.105663

Cited by 17 publications

(13 citation statements)

References 99 publications

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“…The ubiquitous sand-sized mudstone intraclasts further demonstrate the erosive character of flows affecting the floodplain areas. The ubiquitous presence of sand-sized mudstone aggregates in fluvial deposits is attributed to the washing out of deeply cracked floodplain soils during dry periods, a process that is recognised in both modern and ancient fluvial systems (Rust and Nanson, 1989;Ekes, 1993;Gierlowski-Kordesch and Gibling, 2002;Wright and Marriott, 2007;Dasgupta et al, 2017;Simon and Gibling, 2017;Li et al, 2020). Mud-aggregate texture similar to that described here has been recognised in clay-rich soils by Fitzpatrick (1983).…”

Section: Discussionsupporting

confidence: 65%

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Soares

Basílici

Lorenzoni³

et al. 2020

Sedimentary Geology

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Section: Discussionsupporting

confidence: 65%

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Soares

Basílici

Lorenzoni³

et al. 2020

Sedimentary Geology

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“…The grain size of the lake sediments was affected by the combined effects of multiple external stresses, or the strength of the same force has large fluctuations. Although the end member model has wide applicability [57,58], it is not an effective method to conduct research in this region. Existing studies have shown that the size characteristics of lake sediments are sensitive to the regional climatic environment [59][60][61].…”

Section: Discussionmentioning

confidence: 99%

Variations in Sediment Grain Size from a Lake in the Tianshan Mountain of Central Asia: Implications for Paleoprecipitation Reconstruction

Abuduwaili

Liu

et al. 2020

Applied Sciences

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The Tianshan Mountain is the largest mountain range in Central Asia, and the source area of many river systems. Changes in precipitation result in significant alterations to regional hydrological processes. Lake sediment from the Tian Shan representative of the last 90 years was chosen as the object of this research study. The grain-size data were used in conjunction with instrumental data to provide a method for determining changes in paleoprecipitation. The results showed the three-point moving average curve of the silty fraction content with a size of 16 to 32 μm to be significantly consistent with the curve of total precipitation from April to September since 1950. The total content of clay and fine-silty fraction (0–16 μm) was clearly consistent with the monthly precipitation in July. The total precipitation from April to September showed a significant downward trend from 1930 to 1975, and then an overall increasing trend beginning in 1975, which may have been influenced by the North Atlantic Oscillation. The change in precipitation reconstructed by the grain size of lake sediments was significantly different from the high-resolution gridded datasets (Climatic Research Unit Time-Series version 4.04) because of the lack of data from meteorological stations in China before 1950. The conclusions of this study are significant for evaluating the validity of climatic research unit (CRU) data in arid areas of Western China. In addition, the results of this study serve as a bridge between modern instrumental records and long time-scale paleoclimate research and provide important reference values for future reconstructions of long time-scale paleoclimate.

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“…Additionally, recent work has shown that single‐threaded rivers are also pervasive in barren regions with a sufficient supply of fine sediment or ice (e.g. Donselaar et al ., 2013; Matsubara & Howard, 2014; Li et al ., 2015, 2020, 2022; Matsubara et al ., 2015; van Toorenenburg et al ., 2018; Ielpi, 2019; Lapôtre et al ., 2019; Santos et al ., 2019; Ielpi & Lapôtre, 2019a,b; Ielpi et al ., 2020; Levy & Cvijanovich, 2023). The absence of vegetation affects the morphodynamic processes governing channel and floodplain evolution; notably, maximum channel migration rates are almost ten times faster in such environments than in vegetated rivers of similar size (Ielpi & Lapôtre, 2020).…”

Section: Introductionmentioning

confidence: 99%

A depositional model for meandering rivers without land plants

et al. 2023

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The recognition of meandering rivers in Earth's prevegetation stratigraphic record is hindered by an absence of depositional models specifically tailored to unvegetated single‐channel rivers. As a result, their abundance on the early Earth is currently unknown. Here, sedimentological studies of two modern meandering river reaches with unvegetated banks were conducted. Both reaches are located in arid basins of Nevada, USA. Stratigraphy was analysed in conjunction with satellite imagery and high‐resolution topographic data to understand how channels and floodplains record past flow conditions. Analyses of point‐bar and channel‐fill deposits showed that lateral accretion sets are not heterolithic but, rather, composed of mixed sand and sand‐sized mud aggregates (clumps of clay and silt) interpreted to have formed through flocculation. Levées are present but subdued. Notably, downstream‐migrating outer‐bank‐attached bars are prominent architectural features that may be common in unvegetated meandering rivers in arid landscapes elsewhere. The identification of such depositional elements in the stratigraphic record may enhance recognition of ancient unvegetated meandering rivers and improve reconstructions of palaeohydrology on early Earth and Mars.

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Grain-size variability of point-bar deposits from a fine-grained dryland river terminus, Southern Altiplano, Bolivia

Abstract: This is a repository copy of Grain-size variability of point-bar deposits from a fine-grained dryland river terminus, Southern Altiplano, Bolivia.

Cited by 17 publications

References 99 publications

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Variations in Sediment Grain Size from a Lake in the Tianshan Mountain of Central Asia: Implications for Paleoprecipitation Reconstruction

A depositional model for meandering rivers without land plants

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