Tectonic evolution of the Cenozoic Olympic subduction complex, Washington State, as deduced from fission track ages for detrital zircons

Brandon, M. T.; Vance, Joseph A.

doi:10.2475/ajs.292.8.565

Cited by 247 publications

(180 citation statements)

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“…7), similar to what has been shown in other datasets (Brandon et al, 1998;Batt et al, 2001;Pazzaglia and Brandon, 2001). Our interpretations are in line with previous authors who have highlighted the importance of subduction zone dynamics for setting the pace and pattern of erosion in the Olympic Mountains (Brandon and Vance, 1992;Brandon et al, 1998;Batt et al, 2001;Pazzaglia and Brandon, 2001;Stolar et al, 2007). This result may be unexpected given the glacial impact that has been previously documented throughout the range (Porter, 1964;Montgomery and Greenburg, 2000;Montgomery, 2002;Adams and Ehlers, 2017) and further described in this article.…”

Section: Discussionsupporting

confidence: 92%

Tectonic controls of Holocene erosion in a glaciated orogen

Adams

Ehlers

2018

Earth Surf. Dynam.

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Abstract. Recent work has highlighted a strong, worldwide, alpine glacial impact on orogen erosion rates over the last 2 Ma. While it may be assumed that glaciers increased erosion rates when active, the degree to which past glaciations influence Holocene erosion rates through the adjustment of topography is not known. In this study, we investigate the influence of long-term tectonic and post-glacial topographic controls on erosion in a glaciated orogen: the Olympic Mountains, USA. We present 14 new 10 Be and 26 Al analyses which constrain Holocene erosion rates across the Olympic Mountains. Basin-averaged erosion rates scale with basin-averaged values of 5 km local relief, channel steepness, and hillslope angle throughout the range, similar to observations from non-glaciated orogens. These erosion rates are not related to mean annual precipitation or the marked change in Pleistocene alpine glacier size across the range, implying that glacier modification of topography and modern precipitation parameters do not exert strong controls on these rates. Rather, we find that despite spatial variations in glacial modification of topography, patterns of recent erosion are similar to those from estimates of long-term tectonic rock uplift. This is consistent with a tectonic model where erosion and rock uplift patterns are controlled by the deformation of the Cascadia subduction zone.

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Section: Discussionsupporting

confidence: 92%

Tectonic controls of Holocene erosion in a glaciated orogen

Adams

Ehlers

2018

Earth Surf. Dynam.

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“…This pattern of focused rock uplift and erosion is also predicted for the geometry of the curved subducting Juan de Fuca plate (Crosson and Owens, 1987;Bendick and Ehlers, 2014). Our observations are in line 400 with previous authors who have highlighted importance of subduction zone dynamics for setting the pace and pattern of erosion in the Olympic Mountains (Brandon and Vance, 1992;Pazzaglia and Brandon, 2001;Batt et al, 2001;Brandon et al, 1998;Stolar et al, 2007).…”

Section: Orogenic Processes Governing Erosion Ratessupporting

confidence: 91%

Tectonic controls of Holocene erosion in a glaciated orogen

Adams¹,

Ehlers²

2018

Preprint

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Abstract. Recent work has highlighted a strong, worldwide, glacial impact of orogen erosion rates over the last 2 Ma. While it may be assumed that glaciers increased erosion rates when active, the degree to which past glaciations influence Holocene erosion rates through the adjustment of topography is not known. In this study, we investigate the influence of long-term tectonic and post-glacial topographic controls on erosion in a glaciated orogen, the Olympic Mountains, USA. We present 14 10 new 10 Be and 26 Al analyses which constrain Holocene erosion rates across the Olympic Mountains. Basin-averaged erosion rates scale with basin-averaged values of 5-km local relief, channel steepness, and hillslope angle throughout the range, similar to observations from non-glaciated orogens. These erosion rates are not related to mean annual precipitation or the marked change in Pleistocene alpine glacier size across the range, implying that glacier modification of topography and modern precipitation parameters do not exert strong controls on these rates. Rather, we find that despite intense spatial variations in 15 glacial modification of topography, patterns of recent erosion are similar to those from estimates of long-term tectonic rock uplift. This is consistent with a tectonic model where erosion and rock uplift patterns are controlled by the deformation of the Cascadia subduction zone.

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“…The ZFT data show a progressive decrease in age from 68 4-8 Ma at 3950 m to 384-4 Ma at 2400 m (Fig. 4) that could either be indicative of slow cooling through the temperature interval of ~240-180°C (Brandon and Vance, 1992), or may reflect progressive partial annealing of fission tracks in zircon prior to a discrete cooling event (Kamp et al, 1989). The spread in fission track age for individual zircon grains in these samples (Fig.…”

Section: Tertia~ Reactivation Of Faultsmentioning

confidence: 88%