DOI: 10.1016/j.quascirev.2018.01.018
Scopus记录号: 2-s2.0-85043329090
论文题名: Enhanced Saharan dust input to the Levant during Heinrich stadials
作者: Torfstein A. ; Goldstein S.L. ; Stein M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 186 起始页码: 142
结束页码: 155
语种: 英语
英文关键词: Dead sea
; Dust
; Heinrich events
; Lake lisan
; Sr-Nd-Pb isotopes
Scopus关键词: Arid regions
; Dust
; Glacial geology
; Isotopes
; Lakes
; Landforms
; Lead
; Neodymium alloys
; Strontium
; Strontium alloys
; Ternary alloys
; Atmospheric dust
; Coarse fractions
; Dead sea
; Glacial climate
; Heinrich Events
; Lake watersheds
; Last glacial period
; Sr-nd-pb isotopes
; Lead alloys
英文摘要: The history of dust transport to the Levant during the last glacial period is reconstructed using the isotope ratios of Pb, Sr, Nd, and Hf in sediments of Lake Lisan, the last glacial Dead Sea. Exposed marginal sections of the Lisan Formation were sampled near Masada, the Perazim Valley and from a core drilled at the deep floor of the modern lake. Bulk samples and size fractions display unique isotopic fingerprints: the finest detritus fraction (<5 μm) displays higher 87Sr/86Sr and lower εNd values (0.710–0.713 and −7.0 to −9.8, respectively) relative to the coarser fractions (5–20 μm and <20 μm; 0.708–0.710 and −3.4 to −8.3) and the bulk detritus samples (0.709–0.711 and −6 to −7.5). Similarly, the 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios (18.26-19.02, 15.634-15.68, and 38.25-38.82, respectively) are systematically higher in the finest detritus fraction relative to corresponding coarser fractions and bulk samples. The 87Sr/86Sr and εNd values of the finest fraction correspond with those of atmospheric dust originating from the Sahara Desert, while those of the coarse fractions are similar to loess deposits exposed in the Sinai and Negev Deserts. Pronounced excursions in the Sr-Nd-Pb isotope ratios toward more Sahara-like values coincide with the Heinrich (H) stadials 6, 5 and 1, reflecting significant increases in Saharan dust fluxes during regionally arid intervals, reflected by sharp lake level drops. Moreover, during H6 the dust came from different Saharan sources than during H1 and H5. While the relatively wet glacial climate in the Levant suppressed the transport of dust to the lake watershed, short-term hyper-arid spells during H-stadial intervals were accompanied by enhanced supply of fine Sahara dust to this region. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112238
Appears in Collections: 气候减缓与适应
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作者单位: The Fredy & Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel; The Interuniversity Institute for Marine Sciences, Eilat, 88103, Israel; Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, 61 Rt. 9W, Palisades, NY 10964, United States; Geological Survey of Israel, 30 Malkhe Israel St, Jerusalem, 95501, Israel
Recommended Citation:
Torfstein A.,Goldstein S.L.,Stein M.. Enhanced Saharan dust input to the Levant during Heinrich stadials[J]. Quaternary Science Reviews,2018-01-01,186