Title: Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA
Abstract: Research Article| May 01, 2017 Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA Jill A. Marshall; Jill A. Marshall 1Department of Earth Sciences, 1272 University of Oregon, Eugene, Oregon 97403, USA Search for other works by this author on: GSW Google Scholar Joshua J. Roering; Joshua J. Roering 1Department of Earth Sciences, 1272 University of Oregon, Eugene, Oregon 97403, USA Search for other works by this author on: GSW Google Scholar Daniel G. Gavin; Daniel G. Gavin 2Department of Geography, 1251 University of Oregon, Eugene, Oregon 97403, USA Search for other works by this author on: GSW Google Scholar Darryl E. Granger Darryl E. Granger 3Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, Indiana 47907, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2017) 129 (5-6): 715–731. https://doi.org/10.1130/B31509.1 Article history received: 06 Feb 2016 rev-recd: 29 Aug 2016 accepted: 26 Nov 2016 first online: 06 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jill A. Marshall, Joshua J. Roering, Daniel G. Gavin, Darryl E. Granger; Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA. GSA Bulletin 2017;; 129 (5-6): 715–731. doi: https://doi.org/10.1130/B31509.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Climate regulation of erosion in unglaciated landscapes remains difficult to decipher. While climate may disrupt process feedbacks that would otherwise steer landscapes toward steady erosion, sediment transport processes tend to erase past climate landforms and thus bias landscape evolution interpretations. Here, we couple a 50 k.y. paleoenvironmental record with 24 10Be-derived paleo-erosion rates from a 63-m-thick sediment archive in the unglaciated soil-mantled Oregon Coast Range. Our results span the forested marine oxygen isotope stage (MIS) 3 (50–29 ka), the subalpine MIS 2 (29–14 ka), and the forested MIS 1 (14 ka to present). From 46 ka through 28.5 ka, erosion rates increased from 0.06 mm yr–1 to 0.23 mm yr–1, coincident with declining temperatures. Mean MIS 2 erosion rates remained at 0.21 mm yr–1 and declined with increasing MIS 1 temperatures to the modern mean rate of 0.08 mm yr–1. Paleoclimate reconstructions and a frost-weathering model suggest periglacial processes were vigorous between 35 and 17 ka. While steady erosion is often assumed, our results suggest that climate strongly modulates soil production and transport on glacial-interglacial time scales. By applying a cosmogenic paleo-erosion model to evaluate 10Be concentrations in our sedimentary archive, we demonstrate that the depth of soil mixing (which is climate-dependent) controls the lag time required for cosmogenic erosion rates to track actual values. Our results challenge the widely held assumption that climate has minimal impact on erosion rates in unglaciated midlatitude terrain, which invites reconsideration of the extent to which past climate regimes manifest in modern landscapes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2017
Publication Date: 2017-01-27
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 56
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