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Chemical and isotopic composition of CO2-rich magnesium–sodium–bicarbonate–sulphate-type mineral waters from volcanoclastic aquifer in Rogaška Slatina, Slovenia
Environmental Geochemistry and Health ( IF 4.2 ) Pub Date : 2021-09-09 , DOI: 10.1007/s10653-021-01062-2
Nina Rman 1 , Teodóra Szőcs 2 , László Palcsu 3 , Andrej Lapanje 1
Affiliation  

Bottled natural mineral waters from an andesitic aquifer in Slovenia are enriched in magnesium (1.1 g/l), sulphate (2.2 g/l) and dissolved inorganic carbon (204 g/l). We analysed major ions, trace elements, tritium activity, 14C, δ18OH2O, δ2HH2O, δ13CDIC, gas composition and noble gases in six wells. In addition, 87Sr//86Sr, δ34SSO4 and δ11B were analysed here for the first time. Stable isotopes with δ18O = −11.97 to −10.30‰ and δ2H = −77.3 to −63.8 confirm meteoric origin. CO2 degassing is evident at three wells, causing the oxygen shift of about −1.3‰. Tritium activity was detectable only in the shallowest well, where the freshwater component was dated to the 1960s. δ13CDIC in five waters is −1.78 to + 1.33‰, typical of carbonate dissolution. Radiocarbon is low, 1.03–5.16 pMC. Chemical correction with bicarbonate concentration and δ13C correction methods gave best mean residence times, slightly longer than previously published. Sulphate has δ34S 26.6–28.9‰ and δ18O 8.9–11.1‰ due to dissolution of evaporites in carbonate rocks. Boron at concentrations of 1.2–6.1 mg/l has two origins: δ11B = 11.3–16.4‰ from hydrothermal alteration and δ11B = 26.6–31.7‰ from carbonate dissolution. Strontium at concentrations of 0.5–22.0 mg/l has 87Sr//86Sr, indicating three sources: 0.7106 for Miocene clastic rocks, 0.7082 for Triassic carbonates and 0.7070 for Lower Oligocene andesitic rocks. CO2 represents the majority of the dissolved (> 98.84 vol%) and separated gas (> 95.23 vol%). Methane is only found in two wells with a max. of 0.30 vol%. All waters show excess helium and 16–97% of mantle-derived helium. Since all show subsurface degassing, the paleo-infiltration temperature could not be calculated.



中文翻译:

斯洛文尼亚 Rogaška Slatina 火山碎屑含水层富含 CO2 的镁-钠-碳酸氢盐-硫酸盐型矿泉水的化学和同位素组成

来自斯洛文尼亚安山岩含水层的瓶装天然矿泉水富含镁 (1.1 g/l)、硫酸盐 (2.2 g/l) 和溶解的无机碳 (204 g/l)。对6口井进行了主量离子、微量元素、氚活度、14 C、δ 18 O H2Oδ 2 H H2O、 δ 13 C DIC 、气体成分和惰性气体分析。此外,这里首次分析了87 Sr/ /86 Sr、δ 34 S SO4δ 11 B。稳定同位素δ 18 O = −11.97 至 −10.30‰ 和δ 2 H = −77.3 至 −63.8 确认流星起源。CO 2脱气在三个井中很明显,导致约-1.3‰的氧转移。仅在最浅的井中检测到氚活动,淡水成分可追溯到 1960 年代。五个水域的δ 13 C DIC为-1.78至+1.33‰,典型的碳酸盐溶解。放射性碳很低,1.03–5.16 pMC。使用碳酸氢盐浓度和δ 13 C 校正方法进行的化学校正给出了最佳平均停留时间,比之前公布的时间稍长。硫酸盐具有δ 34 S 26.6–28.9‰和δ 18O 8.9–11.1‰ 由于碳酸盐岩中蒸发岩的溶解。浓度为 1.2–6.1 mg/l 的硼有两个来源:δ 11 B = 11.3–16.4‰ 来自热液蚀变,δ 11 B = 26.6–31.7‰ 来自碳酸盐溶解。浓度为 0.5–22.0 mg/l 的锶有87 Sr/ /86 Sr,表明三个来源:中新世碎屑岩 0.7106、三叠纪碳酸盐岩 0.7082 和下渐新世安山岩 0.7070。二氧化碳_代表大部分溶解气体 (> 98.84 vol%) 和分离气体 (> 95.23 vol%)。甲烷仅在两个最大的井中发现。0.30 体积%。所有水域都显示出过量的氦气和 16-97% 的来自地幔的氦气。由于都显示地下脱气,因此无法计算古渗透温度。

更新日期:2021-09-09
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