PRZEOBRAŻONE RYTMITY SIARCZKOWE W PIASKOWCU BIAŁEGO SPĄGOWCA Z KOPALNI RUDNA

Marek Radliński, Zbigniew Sawłowicz

Abstract


ALTERED RHYTHMIC SULPHIDE BANDS IN THE WEISSLIEGEND SANDSTONE IN THE RUDNA MINE (FORE-SUDETIC MONOCLINE, POLAND)

Abstract. Two cross-sections of Weissliegend sandstones with copper sulphide rhythmic banding from the Rudna Mine were studied. Analyses were performed using optical polarizing (PLM) and scanning electron (SEM-EDS) microscopy and XRD. The rhythmites have different sulphide compositions and they have undergone different alterations. In the RZA cross-section, the rhythmites are composed of copper sulphides, mainly digenite, strongly altered to covellite and atacamite by secondary processes. Primary rhythmites were probably formed via a reaction between hydrogen sulphide from the overlying shale and copper-bearing solutions in the sandstone. Weathering and mining waters were probably responsible for extensive atacamite formation, although other possibilities are also considered. In the RGM cross-section, the rhythmites are composed of Cu–Fe sulphides (bornite and chalcopyrite) and pyrite. This distinct mineralogy may result from a reaction of hydrogen sulphide from the overlying shale with copper- and iron-bearing solutions. Dissolution of pyrite or iron monosulphides present in the sandstone could enrich the solutions in iron. Primary ore mineralization was overlapped by secondary mineralization of slightly different composition.


Keywords


rytmity siarczkowe, łupek miedzionośny, Weissliegend, atacamit, siarczki miedzi.

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