Chaco-Pampean平原和Puna这两个高砷地质省之间的莱尔马河谷地下水中低砷浓度的地质-地貌和地球化学控制。,Science of the Total Environment

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Chaco-Pampean平原和Puna这两个高砷地质省之间的莱尔马河谷地下水中低砷浓度的地质-地貌和地球化学控制。
Science of the Total Environment ( IF 8.2 ) Pub Date : 2019-09-02 , DOI: 10.1016/j.scitotenv.2019.134253
Jesica Murray ₁ , María Romero Orué ₂ , Emilce de Las Mercedes López ₃ , Víctor Hugo García ₄ , Alicia Kirschbaum ₅

Affiliation

阿根廷以世界上地下水中砷（As）浓度最高的最广泛地区之一而闻名。这些地区对应两个地质省份，即高原和普纳高原和查科-潘潘平原。在这个广阔的领土上，在某些特定的环境中，地下水中的砷浓度较低，在某些情况下处于建议的饮用水限值内。在我们的研究中，我们分析和解释了勒马河谷（东方山脉最东部的山间盆地）位于上述高砷地区之间的低砷浓度。该山谷的地下水被消耗用于萨尔塔市和附近城镇的60万居民。自中新世晚期以来山谷的早期地质发展以及随后的构造和气候演变都有利于低海拔普纳高原和Chaco-Pampean平原的低砷浓度。高能沉积环境表征了上古第四纪时期的区域以及沉积物的组成，已经控制了多层含水层的特征。此外，由于缺乏成因的砷源，气候，高雨水渗透率，接近中性的pH值，氧化还原条件以及筛网沉积在较粗的生产层中的水井建设有利于地下水质量的提高。莱尔马河谷的地质和构造演化可以推断到阿根廷西北部的其他类似河谷，并且可以作为探索高质量地下水的有用工具。

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Geological-geomorphological and geochemical control on low arsenic concentration in the Lerma valley groundwater between the two high arsenic geologic provinces of Chaco-Pampean plain and Puna.

Argentina is known for having one of the most extensive areas with high arsenic (As) concentration in groundwater in the world. These areas correspond to two geological provinces, the Altiplano-Puna plateau and the Chaco-Pampean plain. In this large territory, there are some specific environments where the As concentration in groundwater is lower, and in some cases within the recommended limits for drinking water. In our study, we analyze and interpret the low As concentrations reported for the Lerma valley, the easternmost intermontane basin of the Cordillera Oriental, located between the aforementioned high‑arsenic areas. The groundwater from this valley is used for the consumption of >600.000 inhabitants in the city of Salta and nearby towns. The incipient geological development of the valley since the late Miocene and the subsequent tectonic and climatic evolution favored low As concentrations with respect to the Altiplano-Puna plateau and the Chaco-Pampean plain. The high-energy sedimentary environments that characterized the area during Plio-Quaternary times and the composition of the sediments have controlled the characteristics of the multilayered aquifer. Moreover, the absence of geogenic As sources, climate, high rain infiltration rate, near neutral pH, redox conditions, and wells construction with screens settled in coarse productive layers favor groundwater of good quality. The geological and tectonic evolution of the Lerma valley could be extrapolated to other similar valleys in NW Argentina and can be a useful tool for exploration of good quality groundwater. This is of high importance in Latin American territories with high As concentration in groundwater such as Argentina.

更新日期：2019-09-03

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