Naslov
Ore-fluid evolution at the Sasa Pb-Zn skarn deposit, Republic of Macedonia.

Autori
Strmić Palinkaš, Sabina ; Tasev, Goran ; Serafimovski, Todor ; Palinkaš A. Ladislav ; Šmalgl, Danijela ; Peltekovski, Zlatko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
2013 AusIMM New Zealand Branch Annual Conference Proceedings / - Nelson : AusIMM, 2013, 487-494

Skup
AusIMM New Zealand Branch Annual Conference

Mjesto i datum
Nelson, 25.08.2013. - 28.08.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
skarn; hydrothermal; fluid inclusions; lead; zinc

Sažetak
The Sasa Pb–Zn skarn deposit (42.0° N, 22.5° E) is located in the Serbo-Macedonian massif approximately 100 km east from Skopje, Republic of Macedonia. Ore reserves are estimated at 10 million metric tons of 7.5 % lead and zinc. The deposit is hosted by the Lower Paleozoic metamorphic complex composed of gneisses, marbles and quartz-graphite schists. The mineralization is spatially and temporary related to the Tertiary postcollisional intrusions. The volcanic rocks in the area are mostly Qtz-latites and andesites with the K/Ar age between 27 and 24 Ма. The mineralization is represented by skarn and hydrothermal parageneses as two end-member types. The skarns occur in the form of replacement of marble, whereas the hydrothermal mineralization appears as replacements and as open-space fillings. The skarn paragenesis with characteristic zonal structure contains calc-silicate minerals (Mn-pyroxene, garnets, bustamite, rhodonite, ilvaite, epidote), magnetite, pyrite and pyrrhotite. Hydrothermal paragenesis, superimposed onto the skarn assemblages, comprise argentiferous galena, sphalerite, pyrite and minor chalcopyrite. Carbonates and quartz are the major gangue minerals. The fluid inclusion studies recognized three major stages of mineralization: (1) Metasomatic formation of skarn minerals (Mn-pyroxene, garnets, bustamite, rhodonite) during the prograde stage of mineralization from saline and high-temperature fluid of distal magmatic origin. The absence of mineralized contacts between the magmatic and the host rocks as well as the manganese rich mineralogy is suggestive of metasomatism by infiltration of the mineralizing fluids into the host rocks, rather than mineralization by the diffusion driven contact metasomatism. (2) Hydrothermal alteration of skarn minerals (ilvaite, magnetite, pyrrhotite, carbonates, quartz) followed by precipitation of the ore minerals (sphalerite, galena) and syn-ore gangue minerals resulted from the mixing of magmatic and meteoric fluids during the retrograde stage. (3) Deposition of post-ore gangue minerals, mostly carbonates, from diluted fluids.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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