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Secondary sulphate precipitates in the gravel pit at Kumpuselkä esker, northern Finland

Published online by Cambridge University Press:  05 July 2018

T. Eskola  and
V. Peuraniemi
T. Eskola
Affiliation:
Institute of Geosciences, University of Oulu, P.O. Box 3000, 90014 University of Oulu, Finland
V. Peuraniemi*
Affiliation:
Institute of Geosciences, University of Oulu, P.O. Box 3000, 90014 University of Oulu, Finland
*
*E-mail: [email protected]
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Abstract

White and yellowish precipitates were found in a gravel pit in the Kumpuselkäesker chain during the summers of 2004—2007. The esker is located in northern Finland, in the northern Ostrobothnia schist area which contains mica schists with quartz veins, which are locally enriched in Co, Cu, Au, Zn, Pb and Ni. A thin till bed lies between the esker gravel and bedrock. Precipitates were found as small grains on the till surface, encrusting twigs and around small pebbles. Ground-water ponds in the pit measured in the summer of 2006 were very acidic as was the till material. The precipitates comprise secondary sulphates, such as gypsum, pickeringite and Mg-sulphates, which are all water-soluble.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 415 - 417
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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References

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