Arid
DOI10.5194/esurf-6-329-2018
Tracking the Be-10-Al-26 source-area signal in sediment-routing systems of arid central Australia
Struck, Martin1; Jansen, John D.2; Fujioka, Toshiyuki3; Codilean, Alexandru T.1; Fink, David3; Fulop, Reka-Hajnalka1,3; Wilcken, Klaus M.3; Price, David M.1; Kotevski, Steven3; Fifield, L. Keith4; Chappell, John4
通讯作者Struck, Martin
来源期刊EARTH SURFACE DYNAMICS
ISSN2196-6311
EISSN2196-632X
出版年2018
卷号6期号:2页码:329-349
英文摘要

Sediment-routing systems continuously transfer information and mass from eroding source areas to depositional sinks. Understanding how these systems alter environmental signals is critical when it comes to inferring source-area properties from the sedimentary record. We measure cosmogenic Be-10 and Al-26 along three large sediment-routing systems (similar to 100000 km(2)) in central Australia with the aim of tracking downstream variations in Be-10-Al-26 inventories and identifying the factors responsible for these variations. By comparing 56 new cosmogenic Be-10 and Al-26 measurements in stream sediments with matching data (n = 55) from source areas, we show that Be-10-Al-26 inventories in hillslope bedrock and soils set the benchmark for relative downstream modifications. Lithology is the primary determinant of erosion-rate variations in source areas and despite sediment mixing over hundreds of kilometres downstream, a distinct lithological signal is retained. Post-orogenic ranges yield catchment erosion rates of similar to 6-11 mMyr(-1) and silcrete-dominant areas erode as slow as similar to 0.2 mMyr(-1). Be-10-Al-26 inventories in stream sediments indicate that cumulative-burial terms increase downstream to mostly similar to 400-800 kyr and up to similar to 1.1 Myr. The magnitude of the burial signal correlates with increasing sediment cover downstream and reflects assimilation from storages with long exposure histories, such as alluvial fans, desert pavements, alluvial plains, and aeolian dunes. We propose that the tendency for large alluvial rivers to mask their Be-10-Al-26 source-area signal differs according to geomorphic setting. Signal preservation is favoured by (i) high sediment supply rates, (ii) high mean runoff, and (iii) a thick sedimentary basin pile. Conversely, signal masking prevails in landscapes of (i) low sediment supply and (ii) juxtaposition of sediment storages with notably different exposure histories.


类型Article
语种英语
国家Australia ; Denmark
收录类别SCI-E
WOS记录号WOS:000431505400001
WOS关键词BE-10 HALF-LIFE ; COSMOGENIC NUCLIDES ; LAKE EYRE ; DENUDATION RATES ; EROSION RATES ; DESERT DUNEFIELDS ; SOUTHERN AFRICA ; LATE QUATERNARY ; AMS STANDARDS ; NEALES RIVER
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208618
作者单位1.Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia;
2.Aarhus Univ, Dept Geosci, DK-8000 Aarhus C, Denmark;
3.Australian Nucl Sci & Technol Org, Lucas Heights 2234, Australia;
4.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
推荐引用方式
GB/T 7714
Struck, Martin,Jansen, John D.,Fujioka, Toshiyuki,et al. Tracking the Be-10-Al-26 source-area signal in sediment-routing systems of arid central Australia[J],2018,6(2):329-349.
APA Struck, Martin.,Jansen, John D..,Fujioka, Toshiyuki.,Codilean, Alexandru T..,Fink, David.,...&Chappell, John.(2018).Tracking the Be-10-Al-26 source-area signal in sediment-routing systems of arid central Australia.EARTH SURFACE DYNAMICS,6(2),329-349.
MLA Struck, Martin,et al."Tracking the Be-10-Al-26 source-area signal in sediment-routing systems of arid central Australia".EARTH SURFACE DYNAMICS 6.2(2018):329-349.
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