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DOI	10.1016/j.quascirev.2019.105876
	Constraints on aragonite precipitation in the Dead Sea from geochemical measurements of flood plumes
	Belmaker R.; Lazar B.; Stein M.; Taha N.; Bookman R.
发表日期	2019
ISSN	0277-3791
卷号	221
英文摘要	The laminated sequences of the Holocene Dead Sea (DS) and its late Pleistocene precursor Lake Lisan comprise primary aragonite and fine detritus that record the hydro-climate conditions of the late Quaternary Levant. Several studies suggested that the primary aragonite precipitated due to mixing between runoff that brought bicarbonate to the lake and the lake's Ca-chloride brine. However, the factors controlling the aragonite precipitation were not robustly established. Here, we addressed this issue by measuring the chemical composition (pH, Na+, K+, Ca2+, Mg2+, Sr2+, Cl−, Br−, B, alkalinity) of flood plumes where the mixing occurs. The results indicate that: (a) Na+, Mg2+, K+ and Cl− are conservative during the floodwater-brine mixing whereas Ca2+ and Sr2+ adsorb on flood's suspended sediments; (b) Boron (an important alkalinity species in the DS) adsorption on flood's suspended load enabled the bicarbonate that entered the lake via runoff to react with the Ca2+ thus facilitating aragonite precipitation (c) Dissolution of calcite dust blown from the Sahara during winter storm is the source of bicarbonate which is required for aragonite precipitation. These observations explain the occurrence of aragonite laminae both during the wet last glacial period and during the dry last 3000yr. Although the water input during these two periods was completely different, they both were characterized by high dust fluxes and a stratified lake configuration in which the boron concentrations in the epilimnion were low enough to enable the bicarbonate that entered the lake via runoff to react with the lake brine Ca2+ and precipitate aragonite. © 2019 Elsevier Ltd
英文关键词	Borate and carbonate alkalinity; Brine; Dead sea; Dust; Flood plumes; Lake Lisan; Primary aragonite
语种	英语
scopus关键词	Alkalinity; Boron; Brines; Calcite; Chlorine compounds; Dust; Floods; Lakes; Mixing; pH; Runoff; Storms; Suspended sediments; Boron concentrations; Carbonate alkalinity; Chemical compositions; Dead sea; Flood plumes; Geochemical measurements; Last glacial period; Primary aragonite; Carbonate minerals; alkalinity; aragonite; borate; brine; carbonate; chemical composition; climate conditions; dissolution; dust; epilimnion; flood; geochemistry; Holocene; hydrometeorology; measurement method; Pleistocene; precipitation (chemistry); Dead Sea
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151787
作者单位	Dr. Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Mount Carmel, Haifa, Israel; The Fredy & Nadine Hermann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel; Geological Survey of Israel, 32 Yesha'ayahu Leibowitz St., Jerusalem, 9692100, Israel
推荐引用方式 GB/T 7714	Belmaker R.,Lazar B.,Stein M.,et al. Constraints on aragonite precipitation in the Dead Sea from geochemical measurements of flood plumes[J],2019,221.
APA	Belmaker R.,Lazar B.,Stein M.,Taha N.,&Bookman R..(2019).Constraints on aragonite precipitation in the Dead Sea from geochemical measurements of flood plumes.Quaternary Science Reviews,221.
MLA	Belmaker R.,et al."Constraints on aragonite precipitation in the Dead Sea from geochemical measurements of flood plumes".Quaternary Science Reviews 221(2019).