DOI: 10.1016/j.quascirev.2013.02.022
Scopus记录号: 2-s2.0-84875769309
论文题名: Origin of the Sinai-Negev erg, Egypt and Israel: Mineralogical and geochemical evidence for the importance of the Nile and sea level history
作者: Muhs D.R. ; Roskin J. ; Tsoar H. ; Skipp G. ; Budahn J.R. ; Sneh A. ; Porat N. ; Stanley J.-D. ; Katra I. ; Blumberg D.G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 69 起始页码: 28
结束页码: 48
语种: 英语
英文关键词: Aeolian
; Dunes
; Egypt
; Geochemistry
; Holocene
; Israel
; Mineralogical maturity
; Mineralogy
; Nile
; Pleistocene
; Sea level
; Sinai-Negev erg
Scopus关键词: Aeolian
; Dunes
; Egypt
; Holocenes
; Israel
; Mineralogical maturity
; Nile
; Pleistocene
; Sinai-Negev erg
; Arid regions
; Calcite
; Crystallography
; Feldspar
; Geochemistry
; Glacial geology
; Mineralogy
; Minerals
; Quartz
; Rivers
; Sea level
; Sedimentology
; Stratigraphy
; Structural geology
; Sand
; calcite
; depositional environment
; dune
; eolian process
; erg
; Holocene
; Last Glacial
; loess
; mineralogy
; plagioclase
; quartz
; sand
; sea level
; stratigraphy
; Egypt
; Israel
; Negev
; Shamal Sina
; Sinai
; Southern District
; Wadi el Arish
英文摘要: The Sinai-Negev erg occupies an area of 13,000 km2 in the deserts of Egypt and Israel. Aeolian sand of this erg has been proposed to be derived from the Nile Delta, but empirical data supporting this view are lacking. An alternative source sediment is sand from the large Wadi El Arish drainage system in central and northern Sinai. Mineralogy of the Negev and Sinai dunes shows that they are high in quartz, with much smaller amounts of K-feldspar and plagioclase. Both Nile Delta sands and Sinai wadi sands, upstream of the dunes, also have high amounts of quartz relative to K-feldspar and plagioclase. However, Sinai wadi sands have abundant calcite, whereas Nile Delta sands have little or no calcite. Overall, the mineralogical data suggest that the dunes are derived dominantly from the Nile Delta, with Sinai wadi sands being a minor contributor. Geochemical data that proxy for both the light mineral fraction (SiO2/10-Al2O3 + Na2O + K2O-CaO) and heavy mineral fraction (Fe2O3-MgO-TiO2) also indicate a dominant Nile Delta source for the dunes. Thus, we report here the first empirical evidence that the Sinai-Negev dunes are derived dominantly from the Nile Delta. Linkage of the Sinai-Negev erg to the Nile Delta as a source is consistent with the distribution of OSL ages of Negev dunes in recent studies. Stratigraphic studies show that during the Last Glacial period, when dune incursions in the Sinai-Negev erg began, what is now the Nile Delta area was characterized by a broad, sandy, minimally vegetated plain, with seasonally dry anastomosing channels. Such conditions were ideal for providing a ready source of sand for aeolian transport under what were probably much stronger glacial-age winds. With the post-glacial rise in sea level, the Nile River began to aggrade. Post-glacial sedimentation has been dominated by fine-grained silts and clays. Thus, sea level, along with favorable climatic conditions, emerges as a major influence on the timing of dune activity in the Sinai-Negev erg, through its control on the supply of sand from the Nile Delta. The mineralogy of the Sinai-Negev dunes is also consistent with a proposed hypothesis that these sediments are an important source of loess in Israel. © 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60641
Appears in Collections: 过去全球变化的重建
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作者单位: U.S. Geological Survey, Federal Center, MS 980, Box 25046, Denver, CO 80225, United States; Dept. of Geography and Environmental Development, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel; Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel; Geoarchaeology-Paleobiology Department, E-205 NMNH, MRC-121, Smithsonian Institution, Washington, DC 20013, United States
Recommended Citation:
Muhs D.R.,Roskin J.,Tsoar H.,et al. Origin of the Sinai-Negev erg, Egypt and Israel: Mineralogical and geochemical evidence for the importance of the Nile and sea level history[J]. Quaternary Science Reviews,2013-01-01,69