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

Autor:	V. Peuraniemi, T. Eskola
Rok vydání:	2008
Předmět:	geography Gypsum geography.geographical_feature_category Gravel pit Bedrock Schist Geochemistry engineering.material Northern finland Geochemistry and Petrology engineering Mica Geomorphology Geology
Zdroj:	Mineralogical Magazine. 72:415-417
ISSN:	1471-8022 0026-461X
DOI:	10.1180/minmag.2008.072.1.415
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e864e2c781141b49fb8a5e4b887a4526 https://doi.org/10.1180/minmag.2008.072.1.415 Zobrazit plný text záznamu