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Book Chapter

On the origin and fate of the brines in the Dead Sea basin

By
Ittai Gavrieli
Ittai Gavrieli
Geological Survey of Israel, 30 Malkhey Israel St., Jerusalem 95501, Israel
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Mordechai Stein
Mordechai Stein
Geological Survey of Israel, 30 Malkhey Israel St., Jerusalem 95501, Israel
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Published:
January 01, 2006

This paper summarizes the research efforts devoted over the years to the understanding of the origin and evolution of brines in the Dead Sea basin. These brines are characterized by a unique Ca-Chloride composition, which evolved from interaction of evaporated seawater filling the late Neogene Sedom lagoon with the Cretaceous carbonate rocks exposed at the basin-bounding escarpments. Following the disconnection of the lagoon from the open sea and the development of inland lakes, the composition of the ancient Sedom brine changed due to precipitation of evaporites and addition of salts from incoming fresh water. Relative to highly evaporated seawater, these processes led to enrichment of the brines in Cl, Br, Mg, Ca, and K and depletion in Na and SO4. The modern Dead Sea, representing a recent product of these evolutionary processes, derived its ingredients from residual brines that remained after the desiccation of the late Pleistocene Lake Lisan, from incoming fresh water, and from saline springs that emerge along the western shores of the Dead Sea. Similar sources probably dictated the composition of the Pleistocene lakes (Amora, Lisan), though their relative contribution changed through time, reflecting the control of climate on the hydrological system (e.g., the activity of saline springs).

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Contents

GSA Special Papers

New Frontiers in Dead Sea Paleoenvironmental Research

Yehouda Enzel
Yehouda Enzel
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Amotz Agnon
Amotz Agnon
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Mordechai Stein
Mordechai Stein
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Geological Society of America
Volume
401
ISBN print:
9780813724010
Publication date:
January 01, 2006

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