Salt precipitation and dissolution in the late Quaternary Dead Sea: Evidence from chemical and δ37Cl composition of pore fluids and halites

Elan J. Levy, Yoseph Yechieli, Ittai Gavrieli, Boaz Lazar, Yael Kiro, Mordechai Stein, Orit Sivan

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

The chemical composition and δ37Cl of pore fluids from the ICDP core drilled in the deepest floor of the terminal and hypersaline Dead Sea, and halites from the adjacent Mount Sedom salt diapir, are used to establish the dynamics of halite precipitation and dissolution during the last interglacial and glacial periods. Between ∼132 and 116 thousand years ago (ka) halites precipitated in the lake resulting in the expulsion of Na+ and Cl from the residual solution. Over 50% of the Cl reservoir was removed, resulting in a decrease in the Na/Cl ratio from 0.57 to 0.19. This process was accompanied by a decrease in δ37Cl values in the precipitating halites and the associated residual Cl in the lake. The observed decrease fits a Rayleigh distillation curve with a fractionation factor of Δ(NaCl–Dead Sea solution) = +0.32‰ (±0.12) determined in the present study. This behavior implies negligible contribution of external sources of Cl to the lake during the main peak of the last interglacial, MIS5e. Subsequently, during the last glacial (ca. 117 to 17 ka) dissolution of halite took place, the Na+ and Cl inventory were replenished, accompanied by an increase in Na/Cl from 0.21 to 0.55 and in the δ37Cl values from −0.46‰ to −0.12‰. While the lake underwent significant dilution during that time, the decrease in salinity was somewhat suppressed by the dissolution of the halite which was mostly derived from Mount Sedom salt diapir.

اللغة الأصليةإنجليزيّة أمريكيّة
الصفحات (من إلى)127-137
عدد الصفحات11
دوريةEarth and Planetary Science Letters
مستوى الصوت487
تاريخ مبكر على الإنترنت12 فبراير 2018
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 1 أبريل 2018

All Science Journal Classification (ASJC) codes

  • !!Geophysics
  • !!Geochemistry and Petrology
  • !!Earth and Planetary Sciences (miscellaneous)
  • !!Space and Planetary Science

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