Water samples from the Lower Triassic Sandstones aquifer (LTS), plus two waters from the overlying Muschelkalk aquifer and one water from the Dogger limestones are the matter of this geochemical and multi-isotopic study (δ¹⁸O, δD, δ³⁴S, ⁸⁷Sr/⁸⁶Sr, δ¹¹B, δ⁷Li). In addition, C isotopic compositions and ¹⁴C activities were measured. This study aimed at constraining the origin of waters, water/rock interaction processes, and groundwater flow and residence times within their aquifer.

LTS groundwaters have a meteoric origin, some of them recording the very minor contribution of Triassic brines from the deepest aquifer of the Paris Basin, especially at the west end of the LTS aquifer. The two waters from the Muschelkalk aquifer (one of them being the famous Great Source® of Contrexéville), as well as the Dogger water also originate ultimately from meteoric waters.

Boron isotopes emphasize in some waters, especially South of the Bray-Vittel Fault (BVF), interaction processes between fluids and clayey lithologies that are present in some places in the aquifer, apart from the aquicludes. Sr and Li isotopic signatures measured in some LTS waters, especially in the Vittel area South of the fault indicate that leakage processes probably occur between the Muschelkalk aquifer and the LTS aquifer.

Calculated ¹⁴C residence times indicate flowing velocities in the order of 1–3 m/year, depending on leakage rates. Velocities are found to decrease northwestwards, towards the center of the Paris Basin. Geochemical differences between waters sampled North and South of the BVF indicate that this major fault constrains the circulation of groundwaters in this area.

来自下三叠统砂岩含水层 (LTS) 的水样，加上来自上覆 Muschelkalk 含水层的两种水和来自 Dogger 石灰岩的一种水是本地球化学和多同位素研究的对象（δ ¹⁸ O、δD、δ ³⁴ S、⁸⁷ Sr/ ⁸⁶ Sr、δ ¹¹ B、δ ⁷ Li)。此外，还测量了C 同位素组成和¹⁴ C 活性。本研究旨在限制水的来源、水/岩石相互作用过程以及地下水在含水层内的流动和停留时间。

LTS 地下水起源于大气层，其中一些记录了来自巴黎盆地最深含水层的三叠纪卤水的非常微弱的贡献，尤其是在 LTS 含水层的西端。来自 Muschelkalk 含水层的两种水（其中之一是著名的 Contrexéville 的 Great Source®）以及 Dogger 水也最终源自大气水。

硼同位素在一些水域中，特别是在 Bray-Vittel 断层 (BVF) 以南，强调了含水层中除含水层以外的某些地方存在的流体与粘土岩性之间的相互作用过程。在一些 LTS 水域中测量的 Sr 和 Li 同位素特征，特别是在断层以南的 Vittel 地区，表明渗漏过程可能发生在 Muschelkalk 含水层和 LTS 含水层之间。

计算出的¹⁴ C 停留时间表明流速约为 1-3 m/年，具体取决于泄漏率。发现速度向西北方向降低，朝向巴黎盆地的中心。BVF 北部和南部采样的水域之间的地球化学差异表明，这一主要断层限制了该地区地下水的循环。