Geologia Croatica, Vol. 73 No. 3, 2020.
Original scientific paper
https://doi.org/10.4154/gc.2020.14
Fluid Evolution of the Čukaru Peki Cu-Au Porphyry System (East Serbia) inferred from a fluid inclusion study
Miloš Velojić
orcid.org/0000-0002-9629-4802
; University of Belgrade, The Faculty of Mining and Geology, Belgrade, Serbia
Rade Jelenkovic
; University of Belgrade, The Faculty of Mining and Geology, Belgrade, Serbia
Vladica Cvetkovic
orcid.org/0000-0002-5584-5188
; University of Belgrade, The Faculty of Mining and Geology, Belgrade, Serbia
Abstract
Čukaru Peki is a recently discovered copper-gold deposit in the Bor metallogenic zone in east Serbia. Three types of mineralization can be distinguished in this ore deposit: porphyry, high-sulphidation, and transitional epithermal type. This research was focused on fluid inclusion analysis of genetically different veins from the porphyry and the transitional zones of Čukaru Peki with an aim of better understanding the fluid evolution and mineralization processes in this system. Seven types of veins were identified in the porphyry zone of Čukaru Peki and four of these veins contained transparent minerals which were suitable for fluid inclusion analysis. Eight types of inclusion assemblages were distinguished in these veins: type 1 – primary inclusions with homogenization temperatures above 550°C and high salinity, type 2a- scattered polyphase inclusions two salt crystals, type 2b-polyphase inclusions with two salt crystals in crystal growth zones, type 3- brine inclusions with one salt crystal in crystal growth zones, type 4- vapour-rich inclusions, type 5- primary inclusions in anhydrite, and types 6 and 7- secondary low-temperature inclusions This research suggests that saline fluids (30-40% wt.% NaCl eq.) were the most important ones for the formation of porphyry-type mineralization and that the mineralization was formed at temperatures between 350 and 450°C and pressures between 100 and 500 bars. The epithermal stage was characterized by cooler low-salinity fluids with temperatures between 150-350°C, and salinity between 0 and 7 wt.% NaCl eq.
Keywords
Bor metallogenic zone; Timok magmatic complex; fluid inclusions; porphyry Cu deposit; massive sulphides; brines; fluid boiling
Hrčak ID:
246374
URI
Publication date:
26.10.2020.
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