A discussion of geochemistry of regionally metamorphosed skarns of the Krušné hory Mountains, Czech Republic, and implications for their genesis
Skarns of the Přísečnice area in the Krušné hory Mountains were affected by a regional metamorphism corresponding to central zones of the almandine amphibolite facies. Hence, their premetamorphic origin is unclear. Geochemical investigations have shown that the skarn chemistry can be best explainned by an original high-temperature metasomatism of contact metamorphic type of appropriate rocks (limestones, to lesser extent schists), caused by fluids derived from an igneous source. Precambrian banded iron ores which were considered by Kotková (1991) to be a premetamorphic protolith of the skarns display another geochemical signature. The skarns of the Přísečnice area exhibit significant positive Eu anomalies. However, these anomalies do not represent a specific feature of volcano-sedimentary iron ores, as they also occur in skarns of contact metasomatic type. In both cases they are derived from ascending ore-bearing fluids and hydrothermal solutions from which Eu coprecipitated with Fe.
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