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首页> 外文期刊>Environmental earth sciences >Geochemical indicators of interbasin groundwater flow within the southern Rio Grande Valley, southwestern USA
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Geochemical indicators of interbasin groundwater flow within the southern Rio Grande Valley, southwestern USA

机译：美国西南部里奥格兰德河谷南部盆地间地下水流动的地球化学指标

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Increased groundwater withdrawals for the growing population in the Rio Grande Valley and likely alteration of recharge to local aquifers with climate change necessitates an understanding of the groundwater connection between the Jornada del Muerto Basin and the adjoining and more heavily used aquifer in the Mesilla Basin. Separating the Jornada and Mesilla aquifers is a buried bedrock high from Tertiary intrusions. This bedrock high or divide restricts and/or retards interbasin flow from the Jornada aquifer into the Mesilla aquifer. The potenti-ometric surface of the southern Jornada aquifer near part of the bedrock high indicates a flow direction away from the divide because of a previously identified damming effect, but a groundwater outlet from the southern Jornada aquifer is necessary to balance inputs from the overall Jornada aquifer. Differences in geochemical constituents (major ions, (δD,δ~(18)O, δ~(34)S, and ~(87)Sr/~(86)Sr) indicate a deeper connection between the two aquifers through the Tertiary intrusions where Jornada water is geochemically altered because of a geothermal influence. Jornada groundwater likely is migrating through the bedrock high in deeper pathways formed by faults of the Jornada Fault Zone, in addition to Jornada water that overtops the bedrock high as previously identified as the only connection between the two aquifers. Increased groundwater withdrawals and lowering of the potentiometric surface of the Jornada aquifer may alter this contribution ratio with less overtopping of the bedrock high and a continued deeper flowpath contribution that could potentially increase salinity values in the Mesilla Basin near the divide.
机译：随着里约格兰德河谷不断增长的人口对地下水的取水量的增加，以及随着气候变化可能改变当地蓄水层的补给量，因此有必要了解约纳达·德尔·穆尔托盆地与墨西拉盆地相邻且使用更为频繁的蓄水层之间的地下水联系。将Jornada含水层与Mesilla含水层分隔开来的是一个与第三纪侵入岩高的埋入的基岩。该基岩的高位或分界限制和/或阻碍了从Jornada含水层到Mesilla含水层的流域间流。由于先前确定的筑坝作用，南约拿达含水层的电位计表面靠近基岩高的部分，表明水流方向远离分水岭，但约纳达含水层南部的地下水出口对于平衡整个约纳达的投入是必要的含水层。地球化学成分的差异（主要离子，（δD，δ〜（18）O，δ〜（34）S和〜（87）Sr /〜（86）Sr）表明通过第三系侵入带两个含水层之间的联系更深由于地热的影响，乔纳达水在地球化学上发生了变化，此外，乔纳达水很可能在乔纳达断层带的断层所形成的较深路径中通过基岩高处迁移，此外，乔纳达水超出了基岩高点，这是先前确定的唯一联系。增加的地下水抽取量和Jornada含水层的电势面降低可能会改变这一贡献率，同时基岩的高位越少越少，而流径的贡献也会继续加深，这有可能会增加靠近分水岭的Mesilla盆地的盐度值。

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