Numerical Modeling of the Isotopic Evolution of Very Old Groundwaters in Sedimentary Basins: The 4He/3He, 36Cl/35Cl and 40Ar/36Ar Systems

9417768 Bethke发展对地下水在沉积盆地地下的迁移速度有多快的定量了解，对于我们安全处置有毒和放射性废物的能力以及继续成功地勘探石油和金属资源至关重要。科学家使用基于流动物理定律的计算机模型和基于放射性衰变或放射性同位素积累的地球化学方法来估计流量。令人惊讶的是，这两种独立的方法似乎都是正确的，结果却大相径庭。这项研究旨在通过使用定量方法来协调这些差异，这些方法严格地解释了影响沉积盆地内非常古老的地下水中同位素分布的许多因素。

9417768 Bethke Developing a quantitative understanding of how rapidly groundwater migrates through the subsurface in sedimentary basins is fundamental to our ability to safely dispose of toxic and radioactive wastes as well as to continued successful exploration for petroleum and metallic resources. Scientists estimate flow rates using computer models based on physical laws of flow and with geochemical methods based on the decay of radioactive or accumulation of radiogenic isotopes. Surprisingly, the two independent approaches, both seemingly correct, give broadly differing results. This study aims to reconcile these discrepancies by using quantitative methods that rigorously account for the many factors influencing the distribution of isotopes in very old groundwater within sedimentary basins