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Geochemical and isotopic evidence for upward flow of saline fluid to the Mississippi River Valley alluvial aquifer, southeastern Arkansas, USA
Hydrogeology Journal ( IF 2.8 ) Pub Date : 2021-03-31 , DOI: 10.1007/s10040-021-02321-3
Daniel Larsen , Justin Paul , Randy Cox

Groundwater from the Quaternary Mississippi River Valley Alluvial (MRVA) aquifer in southeasternArkansas (SE AR), USA, has higher salinity compared to other MRVA groundwater. Previous studieshave argued for infiltration of evaporated soil water as a primary source for the elevated salinity, althoughseepage from local rivers and deep groundwater sources also have been considered. Geochemical andisotope data from irrigation, public supply, and industrial wells, as well as subsurface geologic data, areused to demonstrate that upward flow of saline water along regional faults is the primary source of salinityin MRVA aquifer groundwater in SE AR. Sodium, chloride (Cl-) and bromide (Br-) concentrationsillustrate mixing relationships between MRVA aquifer groundwater and Jurassic Smackover Formationbrine, with mixing percentages of <1% Smackover brine being the source of anomalously high Cl-, Br-, andother ions in MRVA groundwater with elevated salinity. Stable oxygen and hydrogen isotope data suggestsubstantial mixing of Paleogene Wilcox Formation water with that of the MRVA aquifer groundwater andvarying degrees of evaporative concentration. Radiocarbon and helium isotope data argue for contributionsof chloride-rich, pre-modern and relatively fresh modern water for recharge to the MRVA aquifer.Chloride concentration in MRVA aquifer waters closely follows the spatial distribution of earthquake-inducedliquefaction features and known or suspected geologic faults in SE AR and northeastern Louisiana.A conceptual model is developed where deep-seated basinal fluids in overpressured reservoirs migrateupward along faults during and following Holocene earthquakes into the overlying MRVA over 100s to1,000s of years



中文翻译:

地球化学和同位素证据表明,盐分流体向上流向美国阿肯色州东南部的密西西比河谷冲积层

与其他MRVA地下水相比,美国阿肯色州东南部(SE AR)的密西西比河谷第四纪冲积层(MRVA)含水层的地下水盐度更高。尽管也考虑了当地河流和深层地下水的渗流,但先前的研究认为蒸发的土壤水的渗透是增加盐分的主要来源。来自灌溉,公共供应和工业井的地球化学和同位素数据,以及地下地质数据,被用来证明沿区域断层的盐水的向上流动是东南非洲MRVA含水层地下水盐度的主要来源。钠,氯(氯- )和溴化(BR -)concentrationsillustrate混合含水层地下水和侏罗纪斯马科弗Formationbrine MRVA之间的关系,与混合的百分比<1%斯马科弗盐水是异常高的Cl的源- ,溴-,盐度升高的MRVA地下水中的其他离子。稳定的氧和氢同位素数据表明,古近系Wilcox地层水与MRVA含水层地下水大量混合,且蒸发浓度不同。放射性碳和氦同位素数据证明富含氯的,近现代的和相对较新的现代水可用于向MRVA含水层补给.MRVA含水层水中的氯离子浓度密切遵循地震诱发的液化特征和已知或疑似地质断层的空间分布SE AR和路易斯安那州东北部。建立了一个概念模型,其中在全新世地震期间和之后,超压油藏中的深层盆地流体沿着断层向上迁移到上覆的MRVA中,持续了100到1000多年的时间

更新日期:2021-03-31
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