[PDF]  https://doi.org/10.3952/physics.v61i1.4407

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 61, 53–61 (2021)
 

ENVIRONMENTAL ISOTOPES AND NOBLE GAS AGES OF THE DEEP GROUNDWATER WITH COUPLED FLOW MODELLING IN THE BALTIC ARTESIAN BASIN
Robert Mokrik, Vytautas Samalavičius, Marius Gregorauskas, and Modestas Bujanauskas
  Institute of Geosciences at Vilnius University, Čiurlionio 21/27, 03101 Vilnius, Lithuania
Email: robert.mokrik@gf.vu.lt; vytautas.samalavicius@chgf.vu.lt

Received 28 August 2020; revised 6 January 2021; accepted 12 January 2021

In this study, modelled groundwater actual flow times in intermediate and deep aquifers, covered by regional scale impermeable aquitards, were compared with 4He and 81Kr age dating results. To improve the reliability of the steady state 3D groundwater flow model, the isotopic ages of deep groundwater were compared to the MODPATH modelled travel times. The highest helium values in groundwater reservoirs coincide with fault zones in the crystalline basement and sedimentary cover near Rapakivi granite massifs. Insights into isotope-geochemical anomalies of the Baltic Artesian Basin intermediate and deep groundwater support their main distribution peculiarities in the flow path towards the Baltic Sea coast lowland and seabed depression as the regional groundwater discharge area.
Keywords: deep groundwater dating, isotope-geochemistry, flow modelling
PACS: 91.67.Qr, 91.67.Rx, 92.40.Kf

GILIŲJŲ VANDENINGŲ SLUOKSNIŲ POŽEMINIO VANDENS IZOTOPINIAI IR INERTINIŲ DUJŲ AMŽIAI SU TĖKMĖS MODELIAVIMU BALTIJOS ARTEZINIAME BASEINE
Robert Mokrik, Vytautas Samalavičius, Marius Gregorauskas, Modestas Bujanauskas

Vilniaus universiteto Geomokslų institutas, Vilnius, Lietuva
Tyrime buvo palygintas modeliuotas požeminio vandens srauto judėjimo laikas vidutiniuose ir giliuose vandeninguose sluoksniuose su 4He ir 81Kr izotopais nustatytu amžiumi Baltijos artezinio baseino (BAB) požeminiame vandenyje. Izotopiniai ir hidrogeocheminiai duomenys padėjo kalibruoti ir patikrinti anksčiau sukurtus nuostovios filtracijos 3D požeminio vandens srauto modelius. Padidėjęs helio kiekis vandeninguose sluoksniuose sutampa su kristalinio pamato ir nuosėdinės dangos lūžių zonomis, esančiomis šalia Rapakivio granito masyvų Baltijos jūros pakrantėje. Atmosferinės kilmės 81Kr izotopo trajektorija turėtų atitikti modeliuotą dalelių judėjimo kryptį ir parodyti panašius požeminio vandens amžiaus rezultatus. Gauti duomenys atskleidė, kad 81Kr izotopo ir modeliuotų dalelių amžiai reikšmingai skiriasi. Skaitmeniniame modelyje trūksta vidinių geologinių struktūrinių elementų, tokių kaip lūžių zonos, todėl norint atspindėti natūralias sąlygas būtina koreguoti hidraulinius modelio parametrus. Remiantis izotopiniais ir hidrogeocheminiais duomenimis, patvirtinta BAB vandens helio anomalijų kilmė, formavimosi procesai ir amžius.
 
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