Hydrogeochemistry of the Middle Rio Grande aquifer system — Fluid mixing and salinization of the Rio Grande due to fault inputs
Hydrogeochemistry of the Middle Rio Grande aquifer system — Fluid mixing and salinization of the Rio Grande due to fault inputs
复制标题
格兰德河中部含水层系统的水文地球化学 – 断层输入导致的格兰德河流体混合和盐化
DOI：
10.1016/j.chemgeo.2013.05.029
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发表时间：
2013
期刊：
影响因子：
3.9
通讯作者：
Woolsey, Emily
中科院分区：
文献类型：
--
作者：
Williams, Amy J.;Crossey, Laura J.;Karlstrom, Karl E.;Newell, Dennis;Person, Mark;Woolsey, Emily
深层流体影响新墨西哥州中部格兰德河裂谷索科罗“收缩”处的河流和地下水水化学。新的水化学断面在格兰德河裂谷提供了三维的观点，对地表水和地下水的来源。除了格兰德河盐度的突然增加外，裂谷两侧泉水和威尔斯井中的主离子和微量离子化学、δ 18 O、δD、δ 13 C、87 Sr/86 Sr、3 H和3 He/4 He的变化最好地解释为深部内生流体与浅层地下水的混合。内生流体沿着裂谷边界断层和裂谷内断层沿着上升，可能导致盐度增加，并伴有金属含量增加和水质总体退化。我们的数据强化了将下游盐度增加归因于地质而非农业影响的模型。浅层含水层中沿着断层的内源沃茨的水化学混合对干旱构造活动区的地下水和地表水的水质和变异性具有重大影响，对水管理具有重要影响。
Deeply-derived fluids influence river and groundwater hydrochemistry at the Socorro “constriction” in the central New Mexico Rio Grande rift. New hydrochemical transects in the Rio Grande rift provide three-dimensional perspectives on sources contributing to surface and groundwaters. In addition to abrupt salinity increases in the Rio Grande, major and trace ion chemistry, δ18O, δD, δ13C,87Sr/86Sr,3H and3He/4He variations in springs and wells across the rift are best explained by mixing of deeply-derived endogenic fluids, containing both mantle and crustal inputs, with shallow groundwater. Endogenic fluids ascend along rift-bounding and intra-rift faults, and can cause increased salinity accompanied by an increase in metals and overall degradation of water quality. Our data reinforce models that attribute a downstream increase in salinity to geological, not agricultural, influences. Hydrochemical mixing of endogenic waters along faults in shallow aquifers has a major influence on groundwater and surface water quality and variability in arid tectonically active regions, with important ramifications for water management.