Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31509.1 |
Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA | |
Marshall, Jill A.1,4; Roering, Joshua J.1; Gavin, Daniel G.2; Granger, Darryl E.3 | |
2017-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | 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 Be-10-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 Be-10 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. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403309300012 |
WOS关键词 | COSMOGENIC NUCLIDES ; SOIL PRODUCTION ; STEADY-STATE ; COAST RANGE ; PACIFIC-NORTHWEST ; DENUDATION RATES ; BE-10 CONCENTRATIONS ; ACCUMULATION RATES ; ALLUVIAL SEDIMENT ; WEATHERING RATES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24758 |
专题 | 地球科学 |
作者单位 | 1.Dept Earth Sci, 1272 Univ Oregon, Eugene, OR 97403 USA; 2.Dept Geog, 1251 Univ Oregon, Eugene, OR 97403 USA; 3.Purdue Univ, Dept Earth Atmospher & Planetary Sci, 550 Stadium Mall Dr, W Lafayette, IN 47907 USA; 4.Univ Calif Berkeley, Dept Earth & Planetary Sci, 307 McCone Hall, Berkeley, CA 94720 USA |
推荐引用方式 GB/T 7714 | Marshall, Jill A.,Roering, Joshua J.,Gavin, Daniel G.,et al. Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Marshall, Jill A.,Roering, Joshua J.,Gavin, Daniel G.,&Granger, Darryl E..(2017).Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Marshall, Jill A.,et al."Late Quaternary climatic controls on erosion rates and geomorphic processes in western Oregon, USA".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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