Lithology, topography, and spatial variability of vegetation moderate fluvial erosion in the south-central Andes

Seagren, E. G.; Schoenbohm, Lindsay M.; Owen, Lewis A.; Figueiredo, Paula; Hammer, Sarah J.; Rimando, Jeremy; Wang, Yang; Bohon, W.

doi:10.1016/j.epsl.2020.116555

Cited by 16 publications

(10 citation statements)

References 51 publications

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“…In the discussion of the resistance of lithology to erosion, our only definitive conclusion was that the soft sedimentary rocks in Italy would be expected to greatly increase the erosion coefficient K , which agrees with the findings of Stock and Montgomery (1999). Studies of the control of lithology on erosion (Seagren et al, 2020) have found that even for similar rock types, such as sedimentary rocks, there are large differences in their resistance to erosion (Snyder et al, 2000; Whipple, Snyder, & Dollenmayer, 2000). Furthermore, bedrock lithology also affects erosional processes and thus it influences the value of n (e.g., Krabbendam & Glasser, 2011; Whipple, Hancock, & Anderson, 2000).…”

Section: Discussionmentioning

confidence: 99%

How does climate affect the topography in tectonically active orogens

Zhang

Guo

et al. 2023

Earth Surf Processes Landf

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A central theme in geomorphology is the quantitative determination of the relationship between topography and its controlling factors, such as tectonics, lithology, and climate. However, rather than relief and slope, channel steepness (k sn ) is a more effective metric for topography, and together with the abundance of beryllium-10 ( 10 Be) erosion rate data, it provides a more convenient means of quantitatively revealing the relationship between topography and its driving factors. A powerlaw relationship between k sn and 10 Be erosion rates has been widely demonstrated, which indicates the dominant control of tectonics on topography, while the dominant control of climate has not been clearly revealed. In this study we selected nine tectonically active regions, comprising 241 catchments, covering a wide range of mean annual precipitation values, and by extracting k sn values and hypsometric curves, we obtained the relationship between k sn and erosion rates. The results show that the power-law relationship differs between regions, largely due to differences in the erosion coefficient, K. After separating the influences of lithology and climate, we found that although soft sedimentary rocks will increase the erosion coefficient, precipitation plays the main role in controlling the erosion coefficient, resulting in a linear relationship between precipitation and K. This relationship clearly demonstrates the occurrence of higher relief under a drier climate, even with similar rates of tectonic uplift.

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Section: Discussionmentioning

confidence: 99%

How does climate affect the topography in tectonically active orogens

Zhang

Guo

et al. 2023

Earth Surf Processes Landf

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“…The general northward increase in divide instability is reflected in modern climate; cross‐divide precipitation and vegetation index values are larger in unstable segments (e.g., 8 and 10, Figure 8). Unlike most of the Puna margin, there is no significant topography to intercept moisture east of segments 8 and 10 and orographic climate gradients have a first order influence on modern basin‐wide erosion rates (Bookhagen & Strecker, 2012; Seagren et al., 2020). In segments 8 and 9, range uplift and the formation of an orographic gradient caused a tenfold decrease in paleo‐erosion rates at the Puna margin by ∼3 Ma, likely stalling divide migration at the plateau (Pingel, Schildgen, et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Stable segments of the Puna margin have minor erosion rate gradients, while unstable segments have external erosion rates an order of magnitude larger than those on the Puna Plateau. Basin‐wide erosion rates on the Puna Plateau, based on terrestrial cosmogenic nuclides (TCN) and the 3D reconstruction of dated fluvial surfaces and calculation of the removed sediment volume, vary between ∼5 and 25 mm/kyr (see Table S9 and Figure S7 for exact erosion rates and sample locations, Bookhagen & Strecker, 2012; Pingel, Alonso, et al., 2019; Seagren et al., 2020; Streit et al., 2017). However, this range is based on four basins, only one of which directly drains the Puna margin in segment 8 (Table S9).…”

Section: Discussionmentioning

confidence: 99%

“…Basin-wide erosion rates on the Puna Plateau, based on terrestrial cosmogenic nuclides (TCN) and the 3D reconstruction of dated fluvial surfaces and calculation of the removed sediment SEAGREN AND SCHOENBOHM 10.1029/2021JF006147 13 of 28 S8, see Text S8). volume, vary between ∼5 and 25 mm/kyr (see Table S9 and Figure S7 for exact erosion rates and sample locations, Bookhagen & Strecker, 2012;Pingel, Alonso, et al, 2019;Seagren et al, 2020;Streit et al, 2017). However, this range is based on four basins, only one of which directly drains the Puna margin in segment SEAGREN AND SCHOENBOHM 10.1029/2021JF006147 15 of 28 S8, see Text S8).…”

Section: Modern Drainage: Divide Stabilitymentioning

confidence: 99%

“…volume, vary between ∼5 and 25 mm/kyr (see TableS9and FigureS7for exact erosion rates and sample locations,Bookhagen & Strecker, 2012;Pingel, Alonso, et al, 2019;Seagren et al, 2020;Streit et al, 2017). However, this range is based on four basins, only one of which directly drains the Puna margin in segment…”

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confidence: 99%

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Drainage Reorganization Across the Puna Plateau Margin (NW Argentina): Implications for the Preservation of Orogenic Plateaus

Seagren

Schoenbohm

2021

JGR Earth Surface

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The topographic evolution of orogens results from complex interactions among tectonics, climate, fluvial processes, and lithology. Rivers respond to changes in uplift rates, climate variability, base level differences, or lithologic contrasts, by adjusting their long profiles and incision rates, transmitting these changes throughout the landscape (e.g., Kirby & Whipple, 2012). Sustained fluvial erosion rate gradients across drainage divides may additionally lead to planform drainage reorganization, including changes to drainage basin areas, the position of drainage divides, and river network topology, through discrete stream capture events and progressive divide migration (e.g., Bishop, 1995;Forte & Whipple, 2018). Both processes are

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