气候变化领域集成服务门户(CCPortal): Mount Sedom salt diapir - Source for sulfate replenishment and gypsum supersaturation in the last glacial Dead Sea (Lake Lisan)

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DOI	10.1016/j.quascirev.2019.105871
	Mount Sedom salt diapir - Source for sulfate replenishment and gypsum supersaturation in the last glacial Dead Sea (Lake Lisan)
	Levy E.J.; Sivan O.; Antler G.; Lazar B.; Stein M.; Yechieli Y.; Gavrieli I.
发表日期	2019
ISSN	0277-3791
卷号	221
英文摘要	During the late Quaternary several hypersaline lakes occupied the tectonic depression of the Dead Sea Basin, depositing sequences of primary-evaporitic mineral phases: aragonite (CaCO3), gypsum (CaSO4·2H2O) and halite (NaCl). Aragonite and gypsum were the dominant primary mineral phases during the glacial periods and their formation required significant import of bicarbonate (HCO3 −) and sulfate (SO4 2−) ions to the lake. While bicarbonate was likely derived from dissolution of calcite in the watershed, the sources of sulfate remained elusive. Here we investigate and quantify the long-term sulfate reservoir changes in the deep waters (hypolimnion) of Lake Lisan (the last glacial Dead Sea) using concentrations and stable isotopes of sulfur in pore-fluids from the cores that were drilled at the lake floor (2010–11) by ICDP (International Continental Drilling Program). From ca. 117ka, pore-fluid sulfate concentrations increased and the brine attained supersaturation with respect to gypsum, peaking during the last glacial maximum (LGM; ca. 20ka). Stable isotopes of pore-fluid sulfate (δ34S and δ18O) are similar to the values found in bulk sulfate minerals from the nearby Mount Sedom salt diapir. We suggest that relatively diluted and cool paleo-epilimnion water facilitated dissolution of halite and anhydrite (CaSO4) of the Mt. Sedom salt diapir, resulting in a localized increase in solution density. Subsequently, this solution sank and mixed with saline hypolimnion water, simultaneously replenishing chloride, sodium and sulfate reservoirs, while diluting it with respect to other solutes. The mixing of the calcium-rich gypsum saturated hypolimnion and the sulfate-rich sinking brine from above resulted in gypsum supersaturation. © 2019 Elsevier Ltd
英文关键词	Dead sea; Lake Lisan; Last glacial; Mt. Sedom diapir; Pore-fluid; Sulfate isotopes
语种	英语
scopus关键词	Calcite; Calcium carbonate; Carbonate minerals; Chloride minerals; Dissolution; Drilling fluids; Glacial geology; Gypsum; Infill drilling; Isotopes; Lakes; Reservoirs (water); Saline water; Salt tectonics; Sodium chloride; Supersaturation; Dead sea; Hypersaline lakes; Last glacial; Last Glacial Maximum; Mt. Sedom diapir; Pore fluids; Solution density; Sulfate concentrations; Sulfur compounds; diapir; gypsum; isotopic analysis; Last Glacial; porewater; sulfate; supersaturation; Dead Sea; Israel; Mount Sedom; Southern District
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/151774
作者单位	Department of Geological & Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva, 8410501, Israel; Geological Survey of Israel, 32 Yesha'ayahu Leibowitz St., Jerusalem, 9692100, Israel; Institute of Earth Sciences, The Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel; Department of Hydrology and Microbiology, Zuckerberg Center, Ben-Gurion University of the Negev, Sede Boker, Israel
推荐引用方式 GB/T 7714	Levy E.J.,Sivan O.,Antler G.,et al. Mount Sedom salt diapir - Source for sulfate replenishment and gypsum supersaturation in the last glacial Dead Sea (Lake Lisan)[J],2019,221.
APA	Levy E.J..,Sivan O..,Antler G..,Lazar B..,Stein M..,...&Gavrieli I..(2019).Mount Sedom salt diapir - Source for sulfate replenishment and gypsum supersaturation in the last glacial Dead Sea (Lake Lisan).Quaternary Science Reviews,221.
MLA	Levy E.J.,et al."Mount Sedom salt diapir - Source for sulfate replenishment and gypsum supersaturation in the last glacial Dead Sea (Lake Lisan)".Quaternary Science Reviews 221(2019).