Arid
DOI10.1002/esp.4051
Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic Be-10
Linari, Colleen L.1,2; Bierman, Paul R.1,2; Portenga, Eric W.3; Pavich, Milan J.4; Finkel, Robert C.5,6; Freeman, Stewart P. H. T.7
通讯作者Bierman, Paul R.
来源期刊EARTH SURFACE PROCESSES AND LANDFORMS
ISSN0197-9337
EISSN1096-9837
出版年2017
卷号42期号:6页码:928-940
英文摘要

The Blue Ridge escarpment, located within the southern Appalachian Mountains of Virginia and North Carolina, forms a distinct, steep boundary between the lower-elevation Piedmont and higher-elevation Blue Ridge physiographic provinces. To understand better the rate at which this landform and the adjacent landscape are changing, we measured cosmogenic beryllium-10 (Be-10) in quartz separated from sediment samples (n=50) collected in 32 streams and from three exposed bedrock outcrops along four transects normal to the escarpment, allowing us to calculate erosion rates integrated over 10(4)-10(5)years. These basin-averaged erosion rates (5.4-49m Myr(-1)) are consistent with those measured elsewhere in the southern Appalachain Mountains and show a positive relationship between erosion rate and average basin slope. Erosion rates show no relationship with basin size or relative position of the Brevard fault zone, a fundamental structural element of the region. The cosmogenic isotopic data, when considered along with the distribution of average basin slopes in each physiographic province, suggest that the escarpment is eroding on average more rapidly than the Blue Ridge uplands, which are eroding more rapidly than the Piedmont lowlands. This difference in erosion rates by geomorphic setting suggests that the elevation difference between the uplands and lowlands adjacent to the escarpment is being reduced but at extremely slow rates. Copyright (c) 2016 John Wiley & Sons, Ltd.


英文关键词beryllium-10 (Be-10) passive margin cosmogenic isotopes
类型Article
语种英语
国家USA ; Scotland
收录类别SCI-E
WOS记录号WOS:000400646100007
WOS关键词ATLANTIC PASSIVE MARGIN ; EASTERN UNITED-STATES ; DENUDATION RATES ; NAMIB DESERT ; GREAT ESCARPMENT ; NORTH-CAROLINA ; EVOLUTION ; SEDIMENT ; AL-26 ; TOPOGRAPHY
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构United States Geological Survey ; University of California, Berkeley
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198355
作者单位1.Univ Vermont, Dept Geol, Burlington, VT 05405 USA;
2.Univ Vermont, Sch Nat Resources, Burlington, VT 05405 USA;
3.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA;
4.US Geol Survey, 959 Natl Ctr, Reston, VA 22092 USA;
5.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA;
6.Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA USA;
7.SUERC Accelerator Mass Spectrometry Lab, East Kilbride, Scotland
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GB/T 7714
Linari, Colleen L.,Bierman, Paul R.,Portenga, Eric W.,et al. Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic Be-10[J]. United States Geological Survey, University of California, Berkeley,2017,42(6):928-940.
APA Linari, Colleen L.,Bierman, Paul R.,Portenga, Eric W.,Pavich, Milan J.,Finkel, Robert C.,&Freeman, Stewart P. H. T..(2017).Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic Be-10.EARTH SURFACE PROCESSES AND LANDFORMS,42(6),928-940.
MLA Linari, Colleen L.,et al."Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic Be-10".EARTH SURFACE PROCESSES AND LANDFORMS 42.6(2017):928-940.
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