Paleohydrology of Lake Kinneret during the Heinrich event H2
Paleohydrology of Lake Kinneret during the Heinrich event H2
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海因里希事件 H2 期间基尼雷特湖的古水文学
DOI：
10.1016/j.palaeo.2014.01.005
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Ben-Avraham
中科院分区：
文献类型：
--
作者：
Almogi-Labin;Mischke;Ben-Avraham
在最后一次冰川时期，基内雷湖(加利利海)水位在高水位和低水位之间波动，反映了湖泊分水岭的水文条件。在这里，我们关注的是该湖从末次冰期MIS2(约27-25亿卡BP)的最高水位(低于平均海平面约170百万米)退缩到约214亿米的低水位(约24亿至21百万年BP)后的水文情况。从欧哈洛-II考古遗址西南岸挖掘和钻探的海沟和钻孔中恢复了这一时间段的湖湖学-水文历史。从海沟中恢复的介形虫(Cyprdeis Torosa)获得了元素、87Sr/86Sr和δ18O同位素数据，为低水位时期的海岸环境提供了信息。介形类的~(87)Sr/~(86)Sr和~(87)Sr/~(？)Ca比值分别在~0.70789~~0.70815和~0.0017~0.0030之间变化，反映了末次冰期湖水和区域径流的贡献。87Sr/86Sr比值的增加反映了最后一次冰川时期Kinneret湖水的减少和当地径流的增加，这些径流冲刷了先前在潮湿和植被茂盛的冰川期间发育的干燥的山地土壤。湖泊在约24ka BP时撤退，与北大西洋的Heinrich事件H2相吻合。H_2在Kinneret湖-死海分水岭表现为严重干旱。伴随着H2后的湖泊水文变化，δ18O值从−=2‰下降到−=4‰，反映了东地中海雨源组成的变化。末次冰川湖87Sr/86Sr比值与泰伯利亚Spa咸水相似，与现代Kinneret湖淡水明显不同，分别为87Sr/86Sr~0.70785和~0.70760。这种差异是由于末次冰期湖高87Sr/86Sr值的氯化钙卤水对末次冰期湖泊的贡献增加，而由于其源头的寒冷结冰条件而使约旦河的贡献减少，而现代Kinneret湖则更多地受到来自约旦分水岭的低87Sr/86Sr值淡水的影响。
During the last glacial period Lake Kinneret (the Sea of Galilee) fluctuated between high and low water levels reflecting the hydrological conditions of the lake watershed. Here, we focus on the hydrology of the lake after its retreat from the last glacial MIS2 (~ 27–25 ka BP) highest stand of ~ 170 m below mean sea level (m bsl) to the low stand of ~ 214 m bsl at ~ 24–21 ka BP. The limnological–hydrological history of this time interval is recovered from trench and borehole that were dug and drilled in the southwestern shore of the lake at Ohalo-II archeological site.Cyprideis torosa(Ostracoda) recovered from the trench yielded elemental,87Sr/86Sr and δ18O isotope data that provide information on the shore environment during the low stand period. The87Sr/86Sr and Sr/Ca ratios in the ostracods, varying between ~ 0.70789 and ~ 0.70815 and 0.0017 and 0.0030, respectively indicate contributions of waters from the last glacial lake and regional runoff. The increase in the87Sr/86Sr ratios reflects the decreasing effect of the last glacial Lake Kinneret waters and enhanced contribution of local runoff that washed down dried mountain soils that were previously developed during the wet and vegetated glacial.The lake retreat at ~ 24 ka BP coincided with the Heinrich event H2 at the northern Atlantic. H2 was expressed by severe aridity in Lake Kinneret–Dead Sea watershed. The limnological–hydrological change at post H2 was accompanied by 2‰ decrease in the δ18O value from − 2‰ to − 4‰ reflecting the change in the composition of the east Mediterranean rain sources.The last glacial lake87Sr/86Sr ratio is similar to the Tiberias Spa saline waters and distinctly different from the modern Lake Kinneret fresh waters:87Sr/86Sr ~ 0.70785 compared to ~ 0.70760, respectively. This difference is explained by enhanced contribution of Ca-chloride brines with high87Sr/86Sr values to the last glacial lake and reduced Jordan River contribution due to cold freezing conditions at its headwaters, while the modern Lake Kinneret is more affected by low87Sr/86Sr freshwater from the Jordan watershed.
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