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The geochemistry of mafic metavolcanics: implications for the origin of the Devonian massive sulfide deposits at Zlaté Hory, Czechoslovakia

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Abstract

Mafic metavolcanic rocks in the area of the Zlaté Hory massive sulfide deposits are interpreted as convergent plate-margin basalts and basaltic andesites metamorphosed to the greenschist facies. According to the major- and trace-element compositions the metabasites exhibit island-arc tholeiitic to low-K, calc-alkaline composition.

Approximately 50% of samples of maifc metavolcanics studied have a salient negative anomaly of Ce in chondrite-normalized REE patterns. The Ce-depleted greenschists are thought to represent hydrothermally altered equivalents of metabasites of island-arc tholeiitic composition. The alteration was accompanied by the sulfide mineralization. That is indicated by enrichment in Ba and S together with correlation of the Ce/Ce* values and CO2 abundances in the Ce-depleted rocks. The Ce anomaly may be caused by alteraton of ore-forming, seawaterderived solutions. The occurrence of Ce-depleted greenschists supports the hypothesis of the volcanogenic origin of the ore deposits in the Zlaté Hory area.

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  1. Institute of Geology and Geotechnics, Czechoslovakian Academy of Sciences, V Holešovičkách 41, 182 09, Prague 8

    F. Patočka

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Patočka, F. The geochemistry of mafic metavolcanics: implications for the origin of the Devonian massive sulfide deposits at Zlaté Hory, Czechoslovakia. Mineral. Deposita 22, 144–150 (1987). https://doi.org/10.1007/BF00204692

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