Barium anomaly in the Cambrian-Vendian aquifer system in North Estonia

Marandi, Andres; Karro, Enn; Puura, Erik

doi:10.1007/s00254-004-1140-y

Cited by 20 publications

(12 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1B). This conception can explain the results of Karro & Marandi (2003), Marandi et al (2004) and Marandi (2007), leading to the conclusion that groundwater pumping induces upconing fluxes from the crystalline basement.…”

Section: Introductionmentioning

confidence: 72%

See 1 more Smart Citation

Upconing of saline water from the crystalline basement into the Cambrian–Vendian aquifer system on the Kopli Peninsula, northern Estonia

Marandi¹,

Vallner²

2010

Estonian J. Earth Sci.

View full text Add to dashboard Cite

The Cambrian-Vendian aquifer system is the most exploited groundwater resource in northern Estonia. As a result, the extensive use of groundwater has caused changes in the direction and velocity of groundwater flow in the Tallinn area. A groundwater flow and transport model of the Kopli Peninsula was built to investigate the upconing of saline water from an underlying layer, due to overexploitation of groundwater. A transient flow model was run in different flow regimes, using the pumping and water head data from the years 1946-2007. The vertical conductivity of crystalline rocks and the lower portion of Cambrian-Vendian rocks was found to be of the greatest importance for the range and shape of upconing phenomena. The results of the current study show that the range of the upconing process is dependent on the depth of the well screen interval. Therefore the results of many previous studies can be biased by the leaking of water from the underlying crystalline basement. The results also suggest that leakage from an underlying layer can be minimized by changing the screen depth of production wells.

show abstract

Section: Introductionmentioning

confidence: 72%

“…Previous studies have revealed a high content of trace elements in the CVAS (Karro & Marandi 2003;Marandi et al 2004;Marandi 2007). Most of them treat the groundwater from the crystalline basement as one possible source of anomalies, as data from deeper wells indicate a higher content of e.g.…”

Section: Introductionmentioning

confidence: 97%

Upconing of saline water from the crystalline basement into the Cambrian–Vendian aquifer system on the Kopli Peninsula, northern Estonia

Marandi¹,

Vallner²

2010

Estonian J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…The barium content of world groundwaters is low, because barium-containing minerals have very low solubility in underground aqueous solutions. The concept of the earlier researchers (Karro & Marandi 2003;Marandi et al 2004) for Estonia that basement rocks are the main source of barium in the Cambrian-Vendian aquifer system is negotiable, because Ba concentrations in the basement rock water of Finland and Sweden are below 0.1 mg/L (WHO 1990;Backman et al 1999). The distinctly elevated barium concentration area in the Cambrian-Vendian aquifer system is limited by the Kunda, Rakvere, and Kohtla-Järve region near the southern coast of the Gulf of Finland (Figs 1-3).…”

Section: Resultsmentioning

confidence: 98%

“…1). During the last years some studies have been performed on the Ba occurrence in Estonian groundwater (Karro & Marandi 2003;Marandi et al 2004). It has been supposed in previous studies that the high barium in Cambrian-Vendian groundwater results from the upward migration of Ba from the underlying weathered crystalline basement.…”

Section: Introductionmentioning

confidence: 99%

The origin of barium in the Cambrian–Vendian aquifer system, North Estonia; pp. 193–208

Mokrik¹,

Karro²,

Savitskaja³

et al. 2009

Estonian Journal of Earth Sciences

View full text Add to dashboard Cite

Identification of the barium occurrence and its origin is made on the basis of the groundwater chemistry study. High Ba content has been detected in the Cambrian-Vendian aquifer system in the coastal vicinity of the Gulf of Finland in Estonia and St Petersburg. The dissolution of Ba from witherite as the primary source was derived from the analysis of the aqueous solution equilibrium with Ba-related minerals. It is reflected in the chemical composition of groundwater and influenced by the galenitecalcite-fluorite polymetallic mineralization in Vendian sandstones. The dissolution and re-deposition of carbonates and baryte are confirmed by mineral saturation states for an aqueous solution and distribution of other species in the groundwater of the Cambrian-Vendian aquifer system in North Estonia.

show abstract

“…Groundwater was sampled systematically from west to south in northern Estonia in order to follow any lateral geochemical changes in its composition during the comprehensive study in 2001 and 2002. At every sampling point groundwater samples from both the Gdov and Voronka aquifers were analysed in order to follow any vertical changes (Karro & Marandi 2003;Marandi et al 2004).…”

Section: Barium Anomaly In the Cambrian-vendian Aquifer Systemmentioning

confidence: 99%

Chemical peculiarities of the Silurian–Ordovician and Cambrian–Vendian aquifer systems in Estonia: an overview of hydrochemical studies

Karro¹,

Marandi²,

Vaikmäe³

et al. 2009

Estonian J. Earth Sci.

View full text Add to dashboard Cite

The chemical composition of groundwater was studied and plausible reasons for its peculiarities were evaluated on the basis of long-term groundwater monitoring data. Fluoride and boron anomaly was distinguished in the Silurian-Ordovician aquifer system in western Estonia. The chemical type of groundwater controls the dissolution of fluorides and boron in water. Their concentrations are highest in deep groundwater having long residence time in the host rocks. The dissolution of carbonate rocks and clayey K-bentonite beds are the sources of F in groundwater. Barium anomaly in the Cambrian-Vendian aquifer system occurs in northeastern Estonia, where the intrusion of saline groundwater from the weathered crystalline basement contributes to the formation of Ba-rich groundwater. The overexploitation of fresh groundwater has resulted in the increase in groundwater salinity, however, detectable intrusion of seawater into the Cambrian-Vendian aquifer system is ruled out by the stable isotope signature.

show abstract

Barium anomaly in the Cambrian-Vendian aquifer system in North Estonia

Cited by 20 publications

References 5 publications

Upconing of saline water from the crystalline basement into the Cambrian–Vendian aquifer system on the Kopli Peninsula, northern Estonia

Upconing of saline water from the crystalline basement into the Cambrian–Vendian aquifer system on the Kopli Peninsula, northern Estonia

The origin of barium in the Cambrian–Vendian aquifer system, North Estonia; pp. 193–208

Chemical peculiarities of the Silurian–Ordovician and Cambrian–Vendian aquifer systems in Estonia: an overview of hydrochemical studies

Contact Info

Product

Resources

About