Przyczynek do znajomości złoża polimetalicznego w Starej Górze

Abstract

CONTRIBUTION TO THE KNOWLEDGE OF A POLYMETALLIC DEPOSIT AT STARA GÓRASummaryThe Stara Góra polymetallic deposit, exploited in the past, occurs in the Góry Kaczawskie Mts., being an important reference point in the discussion o the age and origin of the mineralization in the Palaeozoic rock massif. In the vicinity of the deposit under consideration there are found not only the epimetamorphic schists, known at other sites as adjacent rocks, but also subsequent, Young-Palaeozoic, most probably Upper Carboniferous subvolcanic intrusions of porphyries and keratophyres. The relation between the deposits and these intrusions has never so far been explained satisfactorily.The authors have found a net of ore veinlets to occur in the porphyries (Fig. 4), and have described it in the present paper. The mineral composition, structures, textures and other typomorphic features of ores of these veinlets are identic with those known from polymetallic veins of Stara Góra, cutting there a schist series. One should, therefore, accept that the present-day form of both kinds concentrations is a result of the same geological process which took place after magma activity.Both structures and textures of ores point to a development of the deposit at a zone of mean depths. The co-existence of two varieties of arsenopyrite differing in polishing hardness and in the As: S ratio is here also increasing.