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Multi-isotope (δ 2H, δ 18O, δ 13C-TDIC, δ 18O-TDIC, 87Sr/86Sr) and hydrochemical study on fractured-karstic and detritic shallow aquifers in the Pampean region, Argentina
Isotopes in Environmental and Health Studies ( IF 1.3 ) Pub Date : 2020-09-30 , DOI: 10.1080/10256016.2020.1825412
Melisa Glok-Galli 1, 2 , Daniel E. Martínez 2, 3 , Iñaki Vadillo-Pérez 4 , Adrián A. Silva Busso 5 , Silvia P. Barredo 6 , Orlando M. Quiroz Londoño 2, 3 , Mónica A. Trezza 1
Affiliation  

ABSTRACT Fluxes between fractured-karstified and detritic aquifers are commonly poorly understood in many environments. These two types of aquifers are in contact in the southeastern Pampean region in the Argentine Buenos Aires province, and the aim of this work is to analyze their relationship contributing to improve the hydrological model. A joint application of hydrochemical and multi-isotope (δ 2H, δ 18O, δ 13C-TDIC, δ 18O-TDIC, 87Sr/86Sr) tools was used. TDIC, δ 2H, δ 18O and δ 13C-TDIC allowed differentiating two main end members. Water in the Pampeano aquifer (PA) which is transferred from the fractured-karstic aquifer (F-KA) is characterised by high TDIC around 500–700 mg/L, isotopically depleted in 18O (about −5.5 ‰) and high δ 13C-TDIC (around −10.0 ‰). The other end member is direct recharge water infiltrated into the PA with TDIC ranging from 400 to 500 mg/L, slightly enriched in 18O (δ 18O = −4.8 ‰), and δ 13C-TDIC in the range of soil CO2 as a result of reactions with calcrete concretions (from −20.0 to −9.0 ‰). Dolomite dissolution is the main process controlling the chemistry of the low-mineralized (Mg–Ca-HCO3) waters, whereas high-mineralized (Na-HCO3) waters are strongly influenced by ion-exchange reactions with adsorbed Ca2+ and Mg2+ and by evaporation.

中文翻译:

阿根廷潘佩安地区裂隙岩溶和碎屑浅含水层的多同位素(δ 2H、δ 18O、δ 13C-TDIC、δ 18O-TDIC、87Sr/86Sr)和水化学研究

摘要 在许多环境中,断裂岩溶含水层和碎屑含水层之间的通量通常知之甚少。这两种类型的含水层在阿根廷布宜诺斯艾利斯省的 Pampean 地区东南部接触,这项工作的目的是分析它们之间的关系,有助于改进水文模型。使用了水化学和多同位素(δ 2H、δ 18O、δ 13C-TDIC、δ 18O-TDIC、87Sr/86Sr)工具的联合应用。TDIC、δ 2H、δ 18O 和δ 13C-TDIC 允许区分两个主要端部成员。从裂隙岩溶含水层 (F-KA) 转移的 Pampeano 含水层 (PA) 中的水的特征是高 TDIC,约为 500–700 mg/L,同位素耗尽 18O (约 -5.5 ‰) 和高 δ 13C- TDIC(约-10.0‰)。另一端是直接渗入PA的补给水,TDIC为400~500 mg/L,18O略富集(δ 18O = -4.8 ‰),δ 13C-TDIC在土壤CO2范围内与钙质混凝土的反应(从 -20.0 到 -9.0 ‰)。白云石溶解是控制低矿化 (Mg-Ca-HCO3) 水化学性质的主要过程,而高矿化 (Na-HCO3) 水则受到与吸附的 Ca2+ 和 Mg2+ 的离子交换反应以及蒸发的强烈影响。
更新日期:2020-09-30
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