Erosional response to northward-propagating crustal thickening in the coastal ranges of the U.S. Pacific Northwest

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ID: 295933
2013
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Abstract
We measured basin-scale erosion rates, using cosmogenic ^10^Be concentrations in quartz, from fluvial sediment in rivers draining the coastal mountain ranges of the U.S. Pacific Northwest between 40° and 47° N. Apparent erosion rates are 0.1 to 0.2 mm yr^−1^ throughout the Oregon Coast Ranges north of 43° N, and increase to the south to 0.6 to 1.1 mm yr^−1^ in the northern California coast ranges near 40° N. We propose that these observations display the erosional response to northward-migrating crustal thickening associated with subduction of the Mendocino Triple Junction. North-south variations in erosion rate, range elevation, and metrics of landscape relief and steepness are consistent with the hypotheses that i) their primary cause is northward-migrating crustal thickening; ii) erosion rates are strongly controlled by topographic relief and weakly, if at all, controlled by climate; and iii) the dependence of erosion on relief is nonlinear and obeys a threshold-relief relationship.
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openalex_W2061957429 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Greg Balco, N. J. Finnegan, Andrew S. Gendaszek, Jennifer Stone, N. Thompson
Journal american journal of science
Year 2013
DOI
10.2475/11.2013.01
URL
https://ajsonline.org/article/65508.pdf
Keywords Keywords not found

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