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首页> 外文期刊>Journal of Hydrology >Paleoclimatic investigations using isotopic signatures of the Late Pleistocene-Holocene groundwater of the stratified aquifers in Kuwait
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Paleoclimatic investigations using isotopic signatures of the Late Pleistocene-Holocene groundwater of the stratified aquifers in Kuwait

机译：使用科威特分层含水层的晚熟 - 全新世 - 全新世地下水的同位素签名的古脑电图研究

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The study attempts to determine paleo recharge sources for two major aquifer units of Kuwait, namely, Kuwait Group Aquifer (KGA), and Dammam Formation (DFm) were collected and analyzed for major ions and isotopes. The obtained results of C-14 ages indicated that the groundwater samples ranged from 31.9 Ky to 3.9 Ky in DFm and 23.3 Ky to 0.8 Ky in KGA. The variations in delta O-18 signatures with respect to age reflected that there were two major sources of rainwater such as enriched southern Indian Ocean monsoon and the depleted northwesterly (Mediterranean) vapor source. The samples found to show variations during the three marine isotopic stages (MIS 1-3), Heinrich events, Bolling-Allerod, and Dryas time periods in both aquifers. A shift in the Intertropical convergence zone (ITCZ) was witnessed in the groundwater of both aquifers from 7.8 Ky to 4.9 Ky. The variation in the Holocene climate is mainly due to the influence of tropospheric easterly jet governed by the swing in ITCZ , as a result of Holocene volcanism. The mean delta O-18 values of DFm samples (-3.81 parts per thousand) reflect depletion than KGA samples (-2.31 parts per thousand), and the d-excess values were -0.95 parts per thousand and 2.05 parts per thousand respectively. Thus it could be inferred that the DFm was predominantly recharged during Late Pleistocene period and it was in a relatively cooler climate than recharge environment of KGA. The study infers that KGA was recharged between 26 degrees N and 26.8 degrees N latitudes, and that of the DFm was noted to be recharged (south west of Kuwait) in two different patches between 25.8 degrees N and 26.2 degrees N and 26.7 degrees N-27.4 degrees N latitudes during Late Pleistocene. The KGA was concluded to be recharged between 25.5 degrees N and 27.5 degrees N latitudes, south of Kuwait, during Holocene.
机译：该研究试图确定适用于科威特两种主要含水层单位的Paleo充电来源，即科威特集团含水层（KGA）和DammaM形成（DFM），并分析主要离子和同位素。所获得的C-14年龄的结果表明，地下水样品在kga中的31.9ky至3.9ky至3.9 ky至3.3ky至0.8ky。 Delta O-18签名的变化相对于年龄反映出来，有两个主要的雨水来源，如富豪印度洋季风和耗尽的西北（地中海）蒸气源。发现在三次海洋同位素阶段（MIS 1-3），海因里氏赛，Bolling-Allerod和Dryas时间段内的三种海洋同位素阶段（MIS 1-3）中的变化。在7.8 ky到4.9 ky的两种含水层的地下水中，在两种含水层的地下水中目睹了闭管会收敛区（ITCZ）。全新世气候的变化主要是由于ITCZ中的摇摆摇摆的影响因素的影响。全新世火山主义的结果​​。平均DFM样品的δO-18值（-3.81份/份）反映比kga样品（-2.31份每千份）的耗竭，而D-过量值分别为0.95份/份每千份。因此，可以推断，DFM在晚熟期间主要充电，并且它与KGA的充电环境相对较冷的气候。该研究infers认为KGA在26度N和26.8度的纬度之间再充电，并且DFM的介于25.8度和26.2度N和26.7度之间的两种不同斑块中的（科威特西南）晚熟期间27.4度纬度。在全新世期间，KGA被结束为在科威特南部的25.5度和27.5度N纬度之间进行充电。

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