Okruszcowanie w łupkach metamorficznych na wschód od Niemczy

Helena Dziedzicowa, Bartłomiej Chowaniec

Abstract


MINERALIZATION IN METAMORPHIC SCHISTS IN THE EASTERN PART OF THE NIEMCZA REGION

Summary

Polymetallic sulphides occur in hälleflinta-like rhyolite metatuffs. The metatuffs are composed of quartz and potassium feldspar. They were deposited in the marine environment. The ore deposits contain 80 percent of pyrite and such minerals as chalcopyrite, arsenopyrite, sphalerite, galena, chalcocite, bornite and covellite.
Their connection with the metavolcanic formation and mode of their occurrence tell us about exhalation-sedimentary genesis. The suphides, besides relic, diagenetic interstitial textures, show emulsion ones as wel1. Metal-bearing minerals form the laminae along the sedimentary surfaces (S1) thus having them re-oriented parallel to the strain-slip cleavage (S3). Micas feature the same character:
Sulphides recrystallized together with adjacent rocks under conditions of staurolite-almandine subfacies at maximum temperature of 550–570°C. Recystalization of sulphides, micas and staurolite withstood the strains connected with, the formation of folds (F2). The emulsion textures of chalcopyrite in sphalerite were supposedly formed during the regression of optimal conditions of regional metamorphism.


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