氪-81和氯-36揭示了撒哈拉沙漠一百万年前的地下水
One million year old groundwater in the Sahara revealed by krypton-81 and chlorine-36
摘要：
用一种新的激光原子计数法测量了埃及努比亚含水层深层地下水中的~（81）Kr/Kr。~（81）Kr年龄范围为2x10^5 ~1x10^6年，与~（36）Cl/Cl比值相关，与埃及西南部Uweinat Udalam附近补给区地下水的侧向流动一致。低三角洲-2H值的81氪定年地下水揭示了经常性的大西洋水分来源在更新世洪积期。这些结果表明，81 Kr法测老地下水是强大的，这样的测量现在可以应用于广泛的水文问题。
英文摘要：
Measurements of 81Kr/Kr in deep groundwater from the Nubian Aquifer (Egypt) were performed by a new laser-based atom-counting method. 81Kr ages range from \~2x10^5 to ~1x10^6 yr, correlate with 36Cl/Cl ratios, and are consistent with lateral flow of groundwater from a recharge area near the Uweinat Uplift in SW Egypt. Low delta-2H values of the 81Kr-dated groundwater reveal a recurrent Atlantic moisture source during Pleistocene pluvial periods. These results indicate that the 81Kr method for dating old groundwater is robust and such measurements can now be applied to a wide range of hydrologic problems.
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