Geologija (Dec 1992)
Contribution to the Knowledge of the Ore Clasts from the Novo okno Orebody in the Bor Copper Deposit
Abstract
In the Bor copper deposit, Eastern Serbia, the metasomatic and stockwork orebodies are situated in the hydrohermally altered Upper Cretaceous andésitesand their pyroclasts. Along the southern border of the altered zone occurs in thefresh Upper Cretaceous andesitic pyroclasts the l e n t i c u l a r orebody Novo oknowhich includes beside various andesitic clasts also ore clasts ejected by thesynchronous volcanic eruption. In t h e central p a r t of the orebody the ore clastsinclude p r e d o m i n a n t l y pyrite, r h o m b i c chalcocite a n d covellite. The c e n t r a l p a r t iss u r r o u n d e d by t h e ore i n which t h e ore clasts show very often concentric i n t e r n als t r u c t u r e . They contain in a d d i t i o n to pyrite p a r t i c u l a r l y bornite, as well aschalcopyrite, a n d at g r e a t e r d i s t a n c e s only chalcopyrite. The a u t h o r considers t h att h e concentric internal s t r u c t u r e of t h e mentioned clasts originated during the diagenesis, and t h a t b o t h b o r n i t e a n d c h a l c o p y r i t e are of diagenetic origin.
