Small valley glaciers and the effectiveness of the glacial buzzsaw in the northern Basin and Range, USA

Foster, David S.; Brocklehurst, Simon H.; Gawthorpe, Rob L.

doi:10.1016/j.geomorph.2008.06.009

Cited by 55 publications

(55 citation statements)

References 56 publications

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“…Other hypsometric attributes were calculated by plotting normalized hypsometric frequency distributions for each drainage basin (see Fig. 3B) (see Foster et al, 2008). Each hypsometric frequency distribution comprised 40 altitudinal bins (following the method employed by Egholm et al, 2009), and hypsometric maxima (Hmax) were recorded where an altitude bin had greater area than its four closest neighbours (see Fig.…”

Section: Topographic Attributesmentioning

confidence: 99%

“…2C). Regional Cirq (alt) has been used by previous investigators as an indicator of mean Quaternary equilibrium-line altitude (ELA), based upon the assumption that cirques occupy an intermediate position between gLGM ELAs and modern snowline altitudes (see Porter, 1989;Mitchell and Montgomery, 2006;Foster et al, 2008).…”

Section: Palaeoglacial Attributesmentioning

confidence: 99%

“…The buzzsaw hypothesis states that glacial erosion acts to limit mountain topography, and therefore results in a correlation between peak altitudes and palaeo-ELAs (Brozović et al, 1997;Montgomery et al, 2001;Brocklehurst and Whipple, 2002;Mitchell and Montgomery, 2006;Foster et al, 2008;Egholm et al, 2009;Pedersen et al, 2010). In the Sredinny Mountains, we see a correspondence between peak altitudes and palaeo-ELAs as, when considered for each of the 80 drainage basins, Alt (peak) is positively correlated with both cirq (alt) and gLGM ELA, although the correlation is not exceptionally strong (R = 0.41, and R = 0.27, respectively, see Table 3).…”

Section: Do the Sredinny Mountains Preserve A Record Of The Glacial Bmentioning

confidence: 99%

“…Because glacial erosion is maximised at the ELA and because land surface becomes concentrated at this altitude, one of the key characteristics typically used as evidence of the buzzsaw is a correspondence between hypsometric peaks (Hmax) and palaeo-ELAs (see Brozović et al, 1997;Montgomery et al, 2001;Brocklehurst and Whipple, 2002;Mitchell and Montgomery, 2006;Foster et al, 2008;Egholm et al, 2009). In the northern sector of the Sredinny Mountains, this relationship is not apparent because peaks in landscape hypsometry (Hmax (single) ) occur well below palaeo-ELAs (see Fig.…”

Section: Where Dynamic Glaciers Prevailmentioning

confidence: 99%

“…Subsequent investigations demonstrated the prevalence of this signature in the mountains of North America (Spotila et al, 2004;Mitchell and Montgomery, 2006;Foster et al, 2008Foster et al, , 2010Ward et al, 2012), South America (Thomson et al, 2010), New Zealand (Brocklehurst and Whipple, 2007), Switzerland (Anders et al, 2010), and at a global scale (Egholm et al, 2009;Pedersen et al, 2010). Deviations from the 'classic' buzzsaw signature have been linked to tectonics and bedrock strength (see Foster et al, 2008Foster et al, , 2010Thomson et al, 2010;Ward et al, 2012) and used to infer the former presence of minimally erosive glaciers (Thomson et al, 2010).…”

mentioning

confidence: 99%

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Testing the efficacy of the glacial buzzsaw: insights from the Sredinny Mountains, Kamchatka

Barr

Spagnolo

2014

Geomorphology

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Section: Topographic Attributesmentioning

confidence: 99%

Section: Palaeoglacial Attributesmentioning

confidence: 99%

Section: Do the Sredinny Mountains Preserve A Record Of The Glacial Bmentioning

confidence: 99%

Section: Where Dynamic Glaciers Prevailmentioning

confidence: 99%

mentioning

confidence: 99%

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Testing the efficacy of the glacial buzzsaw: insights from the Sredinny Mountains, Kamchatka

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2014

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Postglacial adjustment of steep, low-order drainage basins, Canadian Rocky Mountains

Hoffmann

Müller

Johnson

et al. 2013

J. Geophys. Res. Earth Surf.

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[1] It is generally argued that Pleistocene glaciation results in increased sediment flux in mountain systems. An important, but not well constrained, aspect of Pleistocene glacial erosion is the geomorphic decoupling of cirque basins from main river systems. This study provides a quantitative link between glacier-induced basin morphology, postglacial erosion, and sediment delivery for mountain headwaters (with basin area <10 km 2 ). We analyze the morphology of 57 headwater basins in the Canadian Rockies and establish postglacial sediment budgets for select basins. Notable differences in headwater morphology suggest different degrees of erosion by cirque glaciers, which we classify into headwater basins with either cirque or noncirque morphology. Despite steeper slope gradients in cirque basins, higher-mean postglacial erosion rates in basins with noncirque morphology (0.43-0.6 mm a À1 ) compared to those in cirques (0.19-0.39 mm a À1 ) suggest a more complex relationship between hillslope erosion and slope gradient in calcareous mountain environments than implied by the threshold hillslope concept. Higher values of channel profile concavity and lower channel gradients in cirques imply lower transport capacities and, thus, lower sediment delivery ratios (SDR). These results are supported by (i) postglacial SDR values for cirques and noncirque basins of <15% and >28%, respectively, and (ii) larger fan sizes at outlets of noncirque basins compared to cirques. Although small headwater basins represent the steepest part of mountain environments and erode significant postglacial sediment, the majority of sediment remains in storage under interglacial climatic conditions and does not affect large-scale mountain river systems.

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Onset Timing and Slip History of the Teton Fault, Wyoming: A Multidisciplinary Reevaluation

et al. 2017

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The dramatic relief of the Teton Range in northwestern Wyoming results from motion along the Teton normal fault. New apatite (U‐Th)/He (AHe) and fission track (AFT) ages of samples collected in the footwall yield fundamental constraints on contrasting models of Teton fault activity and consequent relative footwall uplift. Low‐elevation samples in the immediate footwall of the fault range from 12.5 to 6.5 Ma. AHe ages of samples from subvertical transects range from 57.8 to 6.5 Ma (Rendezvous), 54.0 to 6.8 Ma (Grand), and 20.5 to 7.1 Ma (Moran), with all three transects yielding an expected trend of decreasing age with decreasing elevation. AFT ages obtained from the three transects range from 55.4 to 45.7 Ma (Rendezvous), 43.2 to 13.3 Ma (Grand), and 38.0 to 11.7 Ma (Moran). Inverse thermal history modeling indicates that the onset of relatively rapid cooling, as a proxy for relative footwall uplift, initiated first in the northern part of the range (15–13 Ma) and then migrated south as fault displacement continued (7 Ma to present at Rendezvous). Thus, this work suggests that although the Teton fault likely initiated due to Basin and Range extension, this structure remains active. Normal fault displacement models also suggest a minimum of ~6 km displacement for footwall uplift of ~2 km. If evaluated in the context of established normal fault length‐displacement relationships, this yields a length of ~180 km, substantially longer than current estimates of Teton fault length and putting the northern end of the fault well into, and potentially beyond, the bounds of Yellowstone National Park.

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Small valley glaciers and the effectiveness of the glacial buzzsaw in the northern Basin and Range, USA

Cited by 55 publications

References 56 publications

Testing the efficacy of the glacial buzzsaw: insights from the Sredinny Mountains, Kamchatka

Testing the efficacy of the glacial buzzsaw: insights from the Sredinny Mountains, Kamchatka

Postglacial adjustment of steep, low-order drainage basins, Canadian Rocky Mountains

Onset Timing and Slip History of the Teton Fault, Wyoming: A Multidisciplinary Reevaluation

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