MIS5e期间死海盆地湖底水温及其季节变化的重建

IF 1.9 3区 地球科学 Q1 GEOLOGY
Niels S. Brall, Véronique Gardien, Daniel Ariztegui, Philippe Sorrel, Emmanuel Guillerm, Frédéric Caupin
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引用次数: 4

摘要

冰川间时期的特点是死海盆地的岩盐单元堆积较厚。在这些时间段内,小水滴(流体包裹体,FIs)被捕获在岩盐晶体中,岩盐晶体充当了估计主要湖水条件的化学和物理性质的窗口。在最后一次冰间期海洋同位素5e阶段(约130ka)开始期间,布里渊光谱用于重建死海盆地岩盐岩芯剖面的年分辨率温度。湖底温度可以根据粗/细岩盐相的出现来推断,正如今天在死海冬季/夏季形成等效岩盐相时所观察到的那样。湖底温度连续三年沿粗石盐层方向反复升高。此外,在细(堆积)岩盐相的地层中检测到低FI包埋温度。这些结果表明,与今天相比,死海盆地的季节性强了两倍,海洋同位素第5e阶段开始时的冬天更冷。因此,研究结果突出了利用循环盐层重建地质记录中众多蒸发环境的季节性温度变化的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Reconstructing lake bottom water temperatures and their seasonal variability in the Dead Sea Basin during MIS5e

Reconstructing lake bottom water temperatures and their seasonal variability in the Dead Sea Basin during MIS5e

Interglacial periods are characterised by thick accumulations of halite units in the Dead Sea Basin. During these intervals, small water droplets (fluid inclusions, FIs) were entrapped in the halite crystals which serve as windows to estimate the chemistry and physical properties of the primary lake water conditions. Brillouin spectroscopy is used here to reconstruct annual resolution temperatures from a halite core section in the Dead Sea Basin during the onset of Marine Isotope Stage 5e (ca 130 ka) of the Last Interglacial. Lake bottom temperatures can be inferred based on the occurrence of coarse/fine halite facies, as observed today with the formation of equivalent halite facies during winter/summer seasons in the Dead Sea. A recurring increase in lake bottom temperatures is found along the direction of coarse halite layers in three successive years. Moreover, low FI entrapment temperatures were detected in layers of fine (cumulate) halite facies. These results imply a twofold stronger seasonality in the Dead Sea Basin compared to today, with colder winters at the onset of Marine Isotope Stage 5e. The results therefore highlight the potential of using cyclic salt deposits to reconstruct seasonal temperature variability for numerous evaporitic environments in the geological record.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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