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The sulphur and oxygen isotopic composition of anhydrite from the Upper Pechora Basin (Russia) : new data in the context of the evolution of the sulphur isotopic record of Permian evaporites

Galamay A. R., Meng F., Bukowski K., Ni P., Shanina S. N., Ignatovich O. O.

Geological Quarterly

2016

Vol. 60, No. 4

990--999

This study describes a new determination of the S and O isotope composition of Lower Permian (Kungurian) anhydrites from the Upper Pechora Basin, Cis-Ural region, Russia. δ34S values in sulphate facies vary from +13.7 to +15.1‰; and δ18O values range from +9.3 to +10.4‰. The values of d34S and d18O of anhydrite from halite facies varies from +12.6 to +15.0‰ and +7.5 to +10.9‰ respectively. The quantitative ratio of pyrite content from the water-insoluble residue (silty-sand fraction) is characterized by extremely low (<<1%) to high (4–5%) steep gradation values. The increased presence of pyrite indicates the influence of bacterial sulphate reduction. The sulphate reduction process was more intense, especially when evaporites were formed in mud. The narrow fluctuation range of sulphur and oxygen isotopes values of the measured anhydrite indicates low levels of fractionation. It was established that during the Permian, evolutionary changes in the content of sulphate ions in sea water correlate with the sulphur isotopic composition of marine evaporites

Erkenntnisse aus der sanierung von stark sauren und sulfathaltigen tagebauseen am beispiel des tagebausees gräbendorf

Koch R.

Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

2007

nr 133 (13)

203-216

Conclusions from the restoration of heavily acid and sulphate-containing mining lakes using the Gräbendorf mining lake as an example. With Lusatia's 16 open-cast mines till the year 1990, groundwater lowering to a depth of approx. 100 m below ground level has had considerable impacts on the situation in Lusatia as far as water management is concerned. After the closing of the open-cast mines they filled again with groundwater. The water qualities of the existing mining lakes and of those that are still to be created are often characterised by low pH values and high iron and sulphate concentrations, which, if not treated, may lead to a number of subsequent ecological and economic problems. Therefore different restoration technologies are applied to improve water quality sustainably. With 425 hectares the lake Gräbendorfer See is a mining like of medium size in which the restoration procedure applied is flooding by water imported from the river Spree. Doing this, potentials and limits of flooding with imported water have been illustrated. Therefore for sustainable restoration subsequent measures are required. The results achieved and the measures required in the future are documented and prepared / analysed / processed in a German-Polish INTERREG III A project: Presentation and assessment of the application of restoration procedures for the improvement of the water quality in mining lakes as well as of the groundwater in the euro-region and the lebusa land, which have been influenced by mining". This project will be implemented as a mirror project, i.e. each party has selected an appropriate mining lake for it. Thus we can exchange experience and technologies and, on the basis of this feasibility study (qualified task), can also tackle the joint restoration of further mining lakes.