globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2015.05.024
Scopus记录号: 2-s2.0-84949222133
论文题名:
Causal links between Nile floods and eastern Mediterranean sapropel formation during the past 125 kyr confirmed by OSL and radiocarbon dating of Blue and White Nile sediments
作者: Williams M.A.J.; Duller G.A.T.; Williams F.M.; Woodward J.C.; Macklin M.G.; El Tom O.A.M.; Munro R.N.; El Hajaz Y.; Barrows T.T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 130
起始页码: 89
结束页码: 108
语种: 英语
英文关键词: Blue nile ; Floods ; Nile ; Palaeochannels ; Quaternary ; Sapropels ; Source-bordering dunes ; White nile
Scopus关键词: Landforms ; Luminescence ; Minerals ; Mining laws and regulations ; Sediment transport ; Sediments ; Submarine geology ; Blue Nile ; Nile ; Palaeochannels ; Quaternary ; Sapropels ; Source-bordering dunes ; White Nile ; Floods
英文摘要: It has long been hypothesised that beds of highly organic mud or sapropels seen in marine sediment cores retrieved from the floor of the eastern Mediterranean accumulated during times of high Nile fluvial discharge. Our recent fieldwork in the valleys of the Blue Nile, the White Nile and the main Nile has for the first time revealed a sequence of extreme flood episodes synchronous with sapropel units S5 (124 kyr), S4 (102 kyr), S3 (81 kyr), S2 (55 kyr) and S1 (13.5-6.5 kyr). There are more weakly defined links with Nile floods and sapropel units S9 (240 kyr), S8 (217 kyr), S7 (195 kyr), S6 (172 kyr), but the dating error terms are too large to allow us to be too definite. During times of extreme floods over the past 125 kyr, wide distributary channels of the Blue Nile flowed across the Gezira alluvial fan in central Sudan and transported a bed load of sand and gravel into the lower White Nile valley. The sands were reworked by wind to form source-bordering dunes, all of which contain heavy minerals of Ethiopian provenance. These source-bordering dunes were active at 115-105 kyr, 60 kyr and 12-7 kyr, all times of extreme Blue Nile floods. The flood and dune sediments were dated using a combination of optically stimulated luminescence (OSL) and radiocarbon analyses. The Quaternary record of Nile floods discussed here shows a precessional signal and reflects episodes of stronger summer monsoon and more northerly seasonal movement of the ITCZ, linked to times of higher insolation in northern tropical latitudes. Progressive aggradation of Holocene Nile channels in northern Sudan has had a profound influence upon human settlement in the last 8 kyr. © 2015 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59753
Appears in Collections:过去全球变化的重建

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作者单位: University of Adelaide, Adelaide, SA, Australia; Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, Ceredigion, United Kingdom; School of Chemistry and Physics, University of Adelaide, Adelaide, Australia; The University of Manchester, Geography, School of Environment and Development, Manchester, United Kingdom; Land and Water Research Centre, Agricultural Research and oTechnology Corporation, PO Box 216, Wad Medani, Sudan; Department of Earth and Environmental Sciences, K.U. Leuven, Celestijnenlaan 200E-box 2411, Heverlee, Belgium; Geology Department, International University of Africa, Khartoum, Sudan; Geography Department, College of Life and Environmental Science, University of Exeter, Exeter, Devon, United Kingdom

Recommended Citation:
Williams M.A.J.,Duller G.A.T.,Williams F.M.,et al. Causal links between Nile floods and eastern Mediterranean sapropel formation during the past 125 kyr confirmed by OSL and radiocarbon dating of Blue and White Nile sediments[J]. Quaternary Science Reviews,2015-01-01,130
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