Naslov
Hydrothermal alterations of Vrshnik ore body in Cu porphyry deposit of Buchim, Republic of North Macedonia

Autori
Ivor Perković ; Sabina Strmić-Palinkaš ; Andrea Čobić ; Goran Tasev ; Todor Serafimovski

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
GEOCHEM 2021 - Geochemical Society Meeting / - , 2021, 10-10

Skup
GEOCHEM 2021 - Geochemical Society Meeting

Mjesto i datum
Zagreb, Hrvatska, 08.11.2021. - 10.11.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Porfirna bakarna ležišta, ležište Bučim, hidrotermalne alteracije, mineralogija glina
(Porphyry copper deposits, Bučim deposit, hydrothermal alterations, clay mineralogy)

Sažetak
The Bučim porphyry Cu deposit is an active copper mine, situated in the contact zone of Serbo- Macedonian Masiff and Vardar zone, approximately 80 km SE from Skopje, the capital of the Republic of North Macedonia. The copper mineralization represents a product of the intrusion of several dykes of latitic to latitic-andesitic composition into the basement rocks of the Serbo-Macedonian Masiff. The mineralization, spatially associated with a hydrothermal alteration halo, disseminated or occurs in forms of stockworks. The principal ore minerals are chalcopyrite, bornite, cubanite, pyrite and magnetite. This study combines field observations and a detailed mineral characterization of the hydrothermal alteration zones developed within the Vršnik ore body, one out of four ore bodies which compose the Bučim porphyry Cu deposit. The hydrothermal alteration halo consists of four distinctive zones identified as potassic, phyllic, argillic and chlorite zones. The potassic alteration, characterized by deposition of biotite and siderite accompanied with biotitization of mafic minerals, represents the oldest alteration zone at the Vršnik ore body. Its mineral composition reflects infiltration of high- temperature and pH near-neutral hydrothermal fluids. The phyllic alteration partly overprints the potassic alteration. It is marked by kaolinization and sericitization of feldspars suggesting infiltration of acid fluids. The argillic alteration is represented by the replacement of sericite with illite and smectite. Replacement of mafic minerals with calcite and chlorite is typical for the chlorite alteration zone. The chlorite alteration reflects a high water/rock ratio and it is particularly abundant along the contact of the intrusion with the host gneisses.

Izvorni jezik
Engleski

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