The ore forming fluids in the Allchar polymetallic ore field, FYR Macedonia.

Strmić Palinkas, Sabina and Bermanec, Vladimir and Boev, Blazo and Borojevic Sostaric, Sibila and Palinkas, Ladislav (2005) The ore forming fluids in the Allchar polymetallic ore field, FYR Macedonia. Zbornik radova - Pregled bibliografske jedinice broj: 210332 . pp. 137-138.

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The Allchar polymetallic ore field is located at the southern margin of the Vardar zone, 110 km SE from Skopje, FYR Macedonia. Mineralization of Allchar is subdivided into three zones: (1) High temperature sulfide mineral paragenesis represented mainly by Sb and As mineralization ; (2) Sulfide mineralization barren of Sb and enriched in As and Tl and (3) Low temperature mineral paragenesis represented by barite, native sulfur, calcite, chalcedony and opal (IVANOV, 1986). The Allchar deposit is related to a Pliocene volcano-intrusive complex which occurs along a major regional fault zone between the rigid Pellagonian block on the west and the labile Vardar zone on the east. The basement is composed of Triassic sediments, the Jurassic ophiolites and the Cretaceous sediments (JANKOVIĆ & JELENOVIĆ, 1994). The rocks of volcano-intrusive complex range from andesite-quartz latite to rhyolite and trachyte (BOEV, 1993). Mineralization is spatially related to zonal hydrothermal alterations. The main types of alterations are silicification and argilization. The silification in the southern part of the ore field (zone I) represented by small quartz grains is related to antimony and gold mineralization. Argillitization is mainly developed in the volcanic rocks. In the northern part of the ore field (zone III) silification is represented by occurrence of chalcedony and opal (BOEV, 1993). 2. Samples and methods A fluid inclusion (FI) study was carried out to estimate the P-T conditions during mineralization and to characterize the mineralizing fluid. Microthermometric measurements were performed on primary FIs within doubly polished, ~0.5 mm thick, wafers of: (1) Quartz associated with high temperature sulfide mineralization (zone I) ; (2) Realgar and orpiment associated with sulfide mineralization barren of Sb and enriched in As and Tl (zone II) and (3) Opal associated with low temperature mineralization (zone III). Ultraviolet (UV) fluorescence microscopy was used to estimate the presence of hydrocarbons bearing inclusions.

Item Type: Article
Uncontrolled Keywords: gold, arsenic, thallium, Carlin-type, alteration
Subjects: Natural sciences > Other natural sciences
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Blazo Boev
Date Deposited: 20 Nov 2012 11:17
Last Modified: 07 Oct 2013 10:14

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