Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026318 |
Cation Exchange in Groundwater‐Chemical Evolution and Prediction of Paleo‐Groundwater Flow: A Natural‐System Study | |
Regina M. Capuano; Cole R. Jones | |
2020-04-16 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | The first aquifer‐wide calculations of the clay‐cation compositions in equilibrium with the present‐day groundwater in a clay‐rich coastal aquifer are provided and downgradient changes in Ca on the clay‐exchange site identified three sequential‐downgradient zones, Updip (95‐80% Ca), Transition (80‐60% Ca), and Downdip (60‐40% Ca). These zones form a cation‐exchange front which extends from a meteoric‐water plume, with clays near equilibrium with the fresh‐recharge water (Updip Zone), to clays that are increasingly equilibrated with seawater downgradient (Transition and Downdip Zone). The sediments progress from predominantly fluvial clays in the Updip Zone, to shallow‐marine clays downdip. Updip‐Zone clays are Na poor, with cation exchange downdip progressively dominated by more Ca in the water exchanging for Mg on the clays. In the Transitional and Downdip Zones which have Na on the clays from the original seawater equilibrium, Ca, and further downdip Mg, in the water exchange for Na on the clays. Perturbations in these trends were compared to elements in the groundwater not involved in ion exchange to identify areas of upwelling and halite dissolution. Mass‐balance calculations show that the effect of cation exchange on each pore volume of fluid that flows in the aquifer is large, whereas the effect on the clay composition is small, so the changes in the clay exchange composition can be used to identify the aquifer's past chemical evolution and historical‐flow paths. This understanding coupled with tracers of modern flow (such as Cl), can be used to recognize areas of modern perturbations, such as contamination or salt dissolution. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249209 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Regina M. Capuano,Cole R. Jones. Cation Exchange in Groundwater‐Chemical Evolution and Prediction of Paleo‐Groundwater Flow: A Natural‐System Study[J]. Water Resources Research,2020. |
APA | Regina M. Capuano,&Cole R. Jones.(2020).Cation Exchange in Groundwater‐Chemical Evolution and Prediction of Paleo‐Groundwater Flow: A Natural‐System Study.Water Resources Research. |
MLA | Regina M. Capuano,et al."Cation Exchange in Groundwater‐Chemical Evolution and Prediction of Paleo‐Groundwater Flow: A Natural‐System Study".Water Resources Research (2020). |
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