Porphyry Mo-Cu-W mineralization within precambrian-paleozoic rocks - prospectivity analysis of the border zone of the upper silesia and mał opolska blocks

 

Porphyry Mo–Cu–W mineralization is associated with the boundary zone of the Upper Silesia and Ma³opolska blocks. It isencountered within Ediacarian and Silurian metasediments, as well as in Ordovician, Silurian and Devonian carbonates and siliciclastics,intruded by granitoids and porphyry dikes. Ore mineralization is represented by chalkopyrite, molibdenite and scheelite forming veinlets, im-pregnations and disseminations. Investigation of 66 km of cores from 284 prospective drill holes (done till 1992) provided new data represent-ing the distribution of mineralization on a regional scale. Based on the contours of metal average contents, fve prospective areas (Nowa Wieœ ̄arecka–Myszków–Mrzyg³ód, excluding Myszków deposit,  ̄arki–Kotowice, Zawiercie, Pilica and Dolina Bêdkowska) with porphyryMo–Cu–W mineralization have been delineated on the Ma³opolska Block and Mys³ów area on the Upper Silesia Block. Formation of ore min-eralization was preceded by contact-metasomatic metamorphism (predominantly by biotitisation of granitoids cover extending to 1500 maway from intrusion). Ores are spatially and genetically associated with zones of hydrothermal alteration (feldspathization, silification,epidotization, carbonatization, chloritization, sericitization) developing in and around granitoid and porphyry intrusions. Close spatialand genetic association between mineralization (supported by Re–Os 303–295 Ma ages of molibdenite), Variscan magmatism, alteration,and active Cracow–Lubliniec disslocation system clearly indicates postmagmatic, hydrothermal origin of mineralization. New explorationtargets can be found at the border zone of Ma³opolska and Upper Silesia Block.


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