Groundwater Samples Were Collected And Reported By Sultan Et Al

1584 WordsFeb 1, 20167 Pages
Groundwater samples were collected and reported by Sultan et al. (2011) from Sinai for isotopic analyses of H and O from open and productive wells tapping three types of aquifers: (1) fractured basement, (2) Nubian Sandstone unconfined aquifer cropping out at the foothills of the basement outcrops, and (3) alluvial. They believed that the unconfined and alluvial aquifers fed by a fractured basement aquifer through discharging into the overlying sediments. The δD and δ18O isotopic compositions of the groundwater samples from the unconfined Nubian Sandstone aquifers in the recharge areas cropping out at the foothills of the basement outcrops are somewhat depleted (δD: -22.7 to -32.8‰; δ18O: -4.47 to -5.22‰) compared to those from fractured basement outcrops (δD: -19.9 to -23.2‰; δ18O: -3.77 to -5.05‰) and those from alluvial aquifers (δD: -22.7 to -23.4‰; δ18O: -4.53 to -5.01‰), but they are less depleted than those reported from the Gulf of Suez (Sturchio et al., 1996). The isotopic compositions of the samples from the fractured basement and alluvial aquifers are similar to those of average modern precipitation from Al Arish and Rafah (Fig. 3). The unconfined aquifer shows a mixing between fossil waters of the Western Desert, formed in pluvial period, and modern precipitation deposited in dry and warm climatic conditions (Sultan et al., 1997, 2011). 6.3.6. EASTERN DESERT Hydrogen and oxygen show a wide range of isotopic ratios for Eastern Desert groundwater samples, which

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