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Paleotemperature reconstruction using environmental isotopes and noble gases in groundwater in Morocco
Hydrogeology Journal ( IF 2.8 ) Pub Date : 2020-02-05 , DOI: 10.1007/s10040-020-02121-1
Marianna Túri , Radouan Saadi , Hamid Marah , Marjan Temovski , Mihály Molnár , László Palcsu

A Turonian limestone-dolomite aquifer from the Tadla basin of Morocco was analysed using a multi-tracer approach (δ18O, δ2H, δ13C, 3H, 14C and noble gases) to reconstruct the paleotemperature evolution from the late Pleistocene to the Holocene. The Turonian aquifer was found to be suitable for a groundwater-based paleoclimate reconstruction, representing the Holocene–late Pleistocene epochs. After correction for young water contribution, mean residence times (MRTs) of groundwater were calculated using the Pearson radiocarbon model. Additionally, terrigenic helium content was used as an age indicator. Noble gas temperature (NGT) results from wells with groundwater ages corresponding to glacial periods showed an average of 17.2 ± 1.7°C. In contrast, samples of recent recharge water gave a mean NGT of 25.2 ± 1.3°C. This reveals a temperature difference of 8.0 ± 2.1 °C between the Holocene and late Pleistocene. This significant Pleistocene–Holocene temperature difference observed in Africa has considerable significance and can be extended to address an important topic relating to the nature of the wet epochs during which the fossil aquifers of North Africa were recharged. It is evident that this aquifer was recharged during both interglacial (warm) and glacial (cool) wet periods.



中文翻译:

摩洛哥地下水中环境同位素和稀有气体的古温度重建

使用多示踪剂方法摩洛哥塔德莱盆甲土仑石灰石-白云石含水层进行分析(δ 18 O,δ 2 H,δ 13 C,3 H,14C和稀有气体)重建从更新世晚期到全新世的古温度演化。人们发现,Turonian含水层适用于以地下水为基础的古气候重建,这代表了全新世至晚更新世时期。在校正了年轻水的贡献之后,使用皮尔逊放射性碳模型计算了地下水的平均停留时间(MRT)。另外,将致陆氦含量用作年龄指标。来自井龄与冰川期相对应的井中的惰性气体温度(NGT)结果平均为17.2±1.7°C。相反,最近补给水的样品的平均NGT为25.2±1.3°C。这表明全新世与晚更新世之间的温度差为8.0±2.1°C。在非洲观察到的这一重要的更新世-全新世温差具有相当重要的意义,可以扩展到解决与北非化石含水层充水有关的湿时代的本质有关的重要课题。显然,在冰间期(温暖)和冰期(凉爽)的湿润时期,该含水层都得到了补给。

更新日期:2020-04-21
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